Maximum Bit Rate help

I have been trying to find the best bit rate settings to display from a USB drive on an Xbox 360 or PS3. I found the recommended settings but the maximum bit rate that I set it at, is always exceeded during playback.
For example if I am using the h.264 codec with the bit rate settings of VBR and the maximum bit rate set for 10 Mbps, my bit rate will always spike way higher then 10 Mbps during scenes with more movement. A scene where I'm pointing my camera out of a moving car with houses going by displayed a bit rate of 38.8. In case anyone is wondering I use the bit rate counter on my PS3 to find the bit rate at any give time.
Now When the bit rate spiked at 38.8 for that scene, it dipslayed fine on my PS3, but when played back on my Xbox it stutters a little at that moment.
If I use a CBR of 10 Mbps the bit rate still goes quite a bit over 10 Mbps but didn't approach 40 Mbps like it does when using a variable bit rate. When using a CBR it played back flawlessly on both devices but there was a little drop in quality.
Is there something I am doing wrong or is this just how it works? I assumed the target bit rate is what you are shooting for and the maximum bit rate would never be exceeded. Is that not the case?

I took that it could be inaccurate in to consideration but when I play a blu-ray back the bit rate usually fluctuates between 25-35 Mbps so I assumed the readings were pretty accurate.
I'll try the VLC player as you suggested when I get home. Does it show you the bit rate during playback, the average bit rate, or what?
Also if I set my maximum bit rate to 10 Mbps should it never exceed that?

Similar Messages

What is the maximum bit rate for a short NTSC standard def DVD?

I have about 30 minutes of content from FCP that I want to put on a DVD.
At first I tried iDVD and had problems with burning (although I did somehow make one DVD). So I built the project on DVD SP and made a DVD. However, the iDVD version looked much better. I checked out the file sizes and saw that there was 2 gigs on iDVD and only 1.6 DVD SP. Then I discovered the encoding options on DVD SP and I was curious what is the recommended average and maximum bit rate should be for the highest quality, yet still works in most DVD players?
Thanks.

DVD Bandwidth
The rate is not based on running time.
Some thoughts on rates
7.2 - 8.0 seems to be the general consensus for discs from computers. I play more conservative for the reasson listed in that link

Maximum bit rate iTunes/iPad

I am creating movies with Adobe Encore. Format is H.264 720p.
Encore doesn't have a preset for iPad. After the movie is created I drag it into iTunes (no problem), then I try to sync the iPad and get the message "movie was not transferred to iPad because it cannot be played in this iPad".
What is the maximum bit rate that can be used?
Thanks.

It seems to vary depending upon the specific format used. The iPad tech specs for video:
- H.264 video up to 720p, 30 frames per second, Main Profile level 3.1 with AAC-LC audio up to 160 Kbps per channel, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats;
- MPEG-4 video, up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats;
- Motion JPEG (M-JPEG) up to 35 Mbps, 1280 by 720 pixels, 30 frames per second, audio in ulaw, PCM stereo audio in .avi file format
Note the "up to 2.5 Mbps" for MPEG-4 and "up to 35 Mbps" for M-JPEG

Maximum bit rate for video

I am using Handbrake to convert some video for use on my iPod. Their FAQ alleges that with the advent of iTunes v7.4 the iPod can handle an average bit rate of 2500 kbps. However, I find that the video intermittently pauses briefly on playback if I encode at that rate. Does anyone know the maximum bit rate that the iPod can handle?

Changes to iTunes will have no effect on what the iPod can handle. Different software and hardware.
Which iPod are we talking about? The original 5th generation iPod or the second versions (aka "5.5" gen)?
http://support.apple.com/specs/ipod/iPodwith_video_30_60GB.html
says...
H.264 video: up to 768 Kbps, 320 x 240, 30 frames per sec., Baseline Profile up to Level 1.3 with AAC-LC up to 160 Kbps, 48 Khz, stereo audio in .m4v, .mp4 and .mov file formats
MPEG-4 video: up to 2.5 mbps, 480 x 480, 30 frames per sec., Simple Profile with AAC-LC up to 160 Kbps, 48 Khz, stereo audio in .m4v, .mp4 and .mov file formats
http://support.apple.com/specs/ipod/iPodFifth_Generation_Late2006.html
says...
H.264 video, up to 1.5 Mbps, 640 by 480 pixels, 30 frames per sec., Baseline Low-Complexity Profile with AAC-LC audio up to 160 Kbps, 48 kHz, stereo audio in .m4v, .mp4, and .mov file formats; H.264 video, up to 768 Kbps, 320 by 240 pixels, 30 frames per sec., Baseline Profile up to Level 1.3 with AAC-LC audio up to 160 Kbps, 48 kHz, stereo audio in .m4v, .mp4, and .mov file formats; MPEG-4 video, up to 2.5 Mbps, 640 by 480 pixels, 30 frames per sec., Simple Profile with AAC-LC audio up to 160 Kbps, 48 kHz, stereo audio in .m4v, .mp4, and .mov file formats
Patrick

Bit rate spikes above 7.3-maximum setting?

Hi
I have used a setting of 6.5 ave - 7.3 maximum-2 pass VBR with compressor 1.1 & AC3-192-audio. Burned a DVD-R of the DVDSP2 project and it plays fine in my set top player. However, I noticed when I watched the bit rate display (ave. & max. bit rates- which is an option on the set top player) while playing the DVD-R, the maximum bit rate spiked to 9.4 for a split second on one scene and would jump to 8 to 9 at other times for a split second on a few other scenes. Most of the time peaks were around 7. My question is will this present a problem for playback compatibility on some set top players? Or is this normal & not a problem for most set top DVD players as long as the bit rate spikes are very short in duration? I find it odd that the maximum bit rate setting of 7.3 that I used was over ridden that much to allow 9.4 as a peak-maybe the set top bit rate display is not totally accurate?
I have to burn 300 DVD-R's of this project for mail order distribution (will be burning at 1X using Taiyo Yuden media) so I need to make sure of playback compatibility with most DVD players. Can anyone shed some light on any issues that these sporadic high bit rates might present or is this not an issue for playback compatibility on most set top players?
Thanks in advance...
Della

Della,
Did you try the BitVice demo yet?
I'd be happy to help, so that your experiments with it will be fruitful. If you contact Innobits with any questions, I promise I will answer you personally. You are right in the assumption that bitrate graphs will not tell you any real truths. At least not those you were looking for:-(
Dear you all, Della included of course,
As one of the scientists behind the Bitvice MPEG-2 encoder, I am sad about the time we spend helping people clarify the crazy things they hear. Fortunately there are forums, such as this one, where hopefully clarifying the same things multiple times is not necessary. (Thus the invention of the FAQ)
At BitVice we treat our customers very well, and we are happy to help on this topic also.
There are so many misconceptions about maximum bitrate floating around on the Internet. Therefore, in a perhaps futile attempt, I decided that this might the time for putting my foot down. Hopefully, it may shed some light on the subject, at least to some of you.
No names, but I know that some of you are far better than me to explain technical things in a more "popular" form to members of this forum. If any of you wish to "translate" the essence of it into a more human readable format, please contact me off-line to get a "complete story".
I am not aware of any publically available diagnostic tool, for momentary (peak) bitrate graph calculation, that could be seriously used for MPEG-2 video stream evaluation against what is meant by "maximum bitrate", as defined in the DVD, or MPEG-2, specifications. Please, correct me if you think I'm wrong.
Bitrate graphs are generally created upon inspection of a .m2v file and based on some (non-standardized) time interval.
Depending on how (by which intervals) you are calculating a momentary bitrate of a .m2v file, it may very well vary between 1 to 40 Mbps, even for DVD compliant constant bitrate streams. The MPEG-2 group was obviously aware of this fact and therefore didn't even try to define what "momentary bitrate" is. And, INTERESTINGLY, there is absolutely no need for such a measure anyway, at least not where MPEG-2 is concerned. I hope the following will help to explain why that would be like weighing of a truck by measuring its length instead, regardless whether it was empty or fully loaded.
The DVD spec. has a 9.8 Mbps limit to the video bitrate, and 10.08 Mbps for the total bitrate. However, this has very little to do with what many bitrate graphing applications is trying to tell you. I'd say, unless they offer you to decide which maximum bitrate it is supposed to measure against, it is just pulling your leg. I think this is really sad. You didn't ask, or pay, to be falsely comforted, did you?
It really doesn't work the way you are led to believe. Actually, the MPEG-2 specification is completely silent about how to even calculate any "peak" bitrate (just because it is really beside the point). Instead, this rate problem is handled in a far more sofisticated and clever way, namely by looking at the decoder buffer fullness at all times. This seems to be completely ignored by most bitrate graphing utilities.
Don't get me wrong here, such utilities can still be rather useful for getting a general idea of which parts of a movie requires more bits than others, but that's about all they can do. For your own mental health, don't fall into the trap of thinking that the highest peak (momentary bitrate) is telling you what the max bitrate is. Sorry, if this sounds confusing at first.
The correct way of interpreting the term "maximum" bitrate is
NOT by comparing to any kind of bitrate graph. That is simply because MPEG-2 does not even define any way to calculate such a thing.
Instead, one needs to think of the "maximum" bitrate as the maximum CONSTANT sustained rate, at which a decoder is capable of reading (or pulling) the data from e.g., a DVD disk. Just think about it for a little while and you will understand that it is more a property of the decoder/player than of the MPEG stream (file) itself. Of course, the responsibility of meeting these requirements rests solely on the MPEG-2 encoder. However, and this is very IMPORTANT, the encoder is COMPLETELY FREE to chose ANY strategy or policy to ascertain that the buffer requirements are complied with. That alone, is enough to leave bitrate graphing utilities in the dark of what is really going on.
If the time it takes to display some already buffered frames (which could amount to say 50 to 300 ms, as counted in display time, depending on the situation) is too short for the next (big) frame to be pulled in its entirety from the disk, then the decoder buffer will underflow. Meaning; that no complete frame was received in the buffer by the time next frame was supposed to be decoded. This situation is where you can honestly say that the bitrate of the stream was higher than the decoder was capable of reading.
However, this is a very tricky thing to capture in a bitrate graph just by inspecting the stream, unless you know everything about the current state of the buffers in general (meaning that its recent history is important) AND more specifically knowing at which rate the decoder is supposed to be pulling picture data from the disk, including, of course, any imperfections in the DVD media.
Given this maximum sustained "pulling" rate, which actually corresponds to the "ceiling" setting in BitVice terminology, it is up to the MPEG-2 encoder to create a stream (.m2v file) that will never, neither overlow nor underflow the decoders' buffers. For those who think a step further on this matter, it means that there exists no common time (duration, measured along the display-time axis, or a number of frames) over which one can calculate a peak bitrate. So, however you choose to do; averaging number of bits over one second, over half a second, over a certain amount of frames or whatever, you will NOT find the correct answer to how the bitrate graph should look like, if you want to be able to interpret the peaks as reflecting what the max bitrate is.
Let's agree that an MPEG-2 stream NEVER has a constant frame rate, as seen by a decoder reading at a constant "maximum" bitrate. From this follows;
Assuming a duration, as counted in display time, by which you can divide the number of bits to get a bitrate, is rather pointless, and also wrong. However, that is generally what is assumed by a bitrate graphing utility.
An MPEG-2 video stream NEVER has a constant frame rate, as seen by the decoder. One frame may be swallowed 5 ms and the next may take several hundred milliseconds to completely enter the decoder buffer.
This is because every frame has an individual size, which may vary most considerably (even for CBR), but the decoder reads the stream of them at the same (normally maximum, see the PS below) bitrate. So, while the decoder is displaying one single frame on your TV monitor, it may be receiving and decoding several successive smaller frames. On the other hand, while receiving/decoding larger frames (e.g., I-frames) it will have time to display many previous frames on your monitor, before a single later, and bigger, frame has been completely read into the decoder buffer. I hope this explains why you should be careful about how you interpret any bitrate graphs, especially when maximum bitrate is concerned. (That's the primary reason why we have not designed such a tool for our customers yet).
Instead, and contrary to many other encoders, we have designed the bitrate control in BitVice in such a way that;
1) The target bitrate that you choose (the average over the whole movie) is enforced, extremely accurately, usually less than 0.1%. I have seen files generated by other encoders which have been 200% off the desired bitrate, though. (To get the true average bitrate of an m2v file; divide its number of bits by its duration expressed in seconds. Then you'll see what I mean. Extremely simple math for a 12 year old kid, although the numbers may be big and therefore tend to have many digits in them;-))
2) The "Ceiling" bitrate is NEVER exceeded, not even by one single bit/s. Now, frankly, if your bitrate graphing tool says something else, then it is telling you more about itself than about a file generated by BitVice.
There is sort of a contract between encoder and decoder, like this, where X is the maximum bitrate:
Decoder:
"I promise you that I am able to read your video stream at X Mbps, or less, for as long as you wish."
Encoder:
"OK, then I promise you that my video stream would never need to be read any faster than X Mbps, at any time, and your buffer will never overflow or run dry. However, if your buffer is less than THIS big (the needed buffer size is written at the beginning of the stream, normally 1835008 bits or 224 kB), then you can as well stop already.
I don't know how every other MPEG-2 encoder works in this respect, or if bitrate graphs could be of any help in evaluating them. The only thing I can promise is that with BitVice you can rely on its bitrate control to deliver what you asked for. You could use BitVice in your evaluation of different bitrate graphing utilities though, if you like.
I'll stop here, because I sense that even those of you who have read this far may want me to;-), but, this topic is enough to fill one whole chapter of a book that I may never find the time to write.
I realize that this post may seem controversial at first, so I'm prepared to follow up on any questions, suggestions or comments that you might have.
Kindest
Roger Andersson / Innobits AB, makers of BitVice MPEG-2 encoder for Mac
PS.
Of course, a decoder is assumed to completely stop reading (pulling) from disk whenever its buffer gets full, but then continues at full speed (maximum bitrate) again, whenever the buffer is NOT full.
So the true bitrate graph, according to the decoders' view, is be very easy to recongize, becaue it will just alternate between two values, 0 Mbps and the max bitrate.
Ds.

How Can I Make Encore Create a Bluray Image that uses a Bit Rate that Really Fills The Disc?

I have searched and browsed but have not seen this specific issue.
I realize that if you leave the bit rate alone, Encore will use the best bitrate. In my experience, it doesnt. I have also found that the Disc Info on the Build tab is never correct. The final transcoded size of the ISO is always very different from what is shown.
With the current disc I am making, I am encoding 4 HD m2t video files that total 20 GB on disk. The total running time is about 1hr 50m. Leaving everything set to defaults, the final size of the ISO file is 12 GB. I would like the final size to be around 20GB. I would expect that Encore would do this automatically. Changing bitrate in the project settings and re-transcoding does not change the final size. If I manually set the encoding, the size does change but since the Disc Info is unusable, it is excruciating trial and error. You have to pick settings that you think will work, wait hours for it to transcode, then it is way to big or way to small. I cant figure out how to get it to my target size.
Also, when I transcode the files, Encore never lists the bit rates of the transcoded files. The field is always blank.
It may also be note worthy that I have to first transcode the files, then build the disc. If I dont do that, the transcoding will hang. Even when I do separate the steps, sometimes when I build the disc from the transcoded files, the build of the disc still hangs.
I am running a 3 GHz Quad CPU with 4 GB of Ram in 32 bit XP Pro. I have 5 physical drives of 500 GB each. I also use separate physical drives for the source files vs the target ISO. Disk space is not an issue.
Also, is there any timeframe for when Adobe is going to release a new update? I have also run into other problems on this forum like the wonderful error 6 and the hanging transcoding, although my solutions to both problems were different than what was posted. It is all hit or miss.
Does anyone know if Adobe going to add a feature like on other disc authoring programs where you click a Fit to disc button and it then calculates the best bit rate for the specified disc size? That would make me very happy.
I would appreciate any help here.

Encore does have a fit-to-disc feature, called "automatic transcoding", which chooses the bit rate based upon how much media there is to encode, how much room is currently on the disc, and applying format-legal restrictions (minimum and maximum bit rates allowable by the format).
So for instance, 30 minutes of video will never fill a disc because the required bit rate to do so would be higher than allowable by the format.

How change bit rate

I use Compressor to compress video from FCP. I select dvd best 90 min 4.3 (mpeg-2, two pass VCR best average 5.0 mbps - maximum bit rate 5.8 mbps). After compressing, file show 6.2mpbs. I want to reduce file size. I could not figure out how to reduce even I reduce more on average bit rate and maximum. Is there other place I might oversee. Compressor, I still learn how to use.

Hi
You'll find this tutorial very useful: Building Custom Presets in Compressor 2 , no matter you run version 2 or 3.
Hope that helps !
Alberto

Bit rate too high DVDSP, build stops.

DVD Studio Pro used to be DVD Maestro from Discreet, but I was thinking since Apple bought it long ago, it would have a forum. I searched for DVD and DVDSP and only came up with this forum.
If anybody in here uses DVDSP and if you know the solution I would appreciate help with this.
Upon building this, I did lower the bit rate to a lower size after getting the error message.
As of now I have the BR between 4.2 and 5.2 as the max br.
I'm concerned if I lower it anymore it will start looking like a pixelated mess. Does anybody know how low you can take the rate and still have a good looking project?
The project was taped in HDV. However I encoded it using compressor so I don't think it's an HD file anymore that DVDSP can't read. In the settings you'll see "SD".
I'm using DVD Studio Pro 4.
The settings I used for compressor were:
Video:
Name: MPEG-2 6.2Mbps 2-pass
Description: Fits up to 90 minutes of video with Dolby Digital audio at 192 Kbps or 60 minutes with AIFF audio on a DVD-5
File Extension: m2v
Estimated size: 2.79 GB/hour of source
Type: MPEG-2 video elementary stream
          Usage:SD DVD
Video Encoder
          Format: M2V
          Width and Height: Automatic
                    Selected: 720 x 480
          Pixel aspect ratio: NTSC CCIR 601/DV (16:9)
          Crop: None
          Padding: None
          Frame rate: (100% of source)
                    Selected: 29.97
          Frame Controls Automatically selected:
                    Retiming: (Fast) Nearest Frame
                    Resize Filter: Linear Filter
                    Deinterlace Filter: Fast (Line Averaging)
                    Adaptive Details: On
                    Antialias: 0
                    Detail Level: 0
                    Field Output: Same as Source
          Start timecode from source
          Aspect ratio: Automatic
                    Selected 16:9
          Field dominance: Automatic:
                     Selected Progressive
          Average bit rate: 6.2 (Mbps)
          2 Pass VBR enabled
                    Maximum bit rate: 7.7 (Mbps)
          High quality
          Best motion estimation
          Closed GOP Size: 15, Structure: IBBP
          DVD Studio Pro meta-data enabled
Audio:
Name: AIFF 48:16
Description: 48kHz, 16-bit AIFF stereo audio
File Extension: aiff
Estimated size: unknown
Audio Encoder
          16-bit Integer (Big Endian), Stereo (L R), 48.000 kHz
Error message from DVDSP
Starting DVD Build BIG_DADDY_DVD...
Compiler Initializing...
Precompiling Project BIG_DADDY_DVD
Compiling VMG Information...
Created 8 PGCs in VTSM1
Created 8 PGCs in VMG.
1 Menu(s) will be created...
Compiling Menu PGCs...
Compiling Menu#1 (Menu 1)...
Rendering Menu:Menu 1,Language:1...
Generating Transition: VTSM #01, VOB #1...
Writing VIDEO_TS.VOB
1 VTSs and 1 Titles will be created...
Compiling VTS#1 (Big Daddy compress video)...
Muxing VTS_01_1.VOB
Video Bitrate Too High
Build cancelled
Building was not successful. See log.
I tried the same project in IDVD and it worked like a charm the first time

There is still a DVDSP Forum - it's under Final Cut Studio at https://discussions.apple.com/community/professional_applications/final_cut_stud io
Select "refine this list" in the blue button to nake it easier to find DVDSP related issues.

Accuracy of DVD player bit rate meters?

Anyone know why different DVD players would display drastically different bit rates as a DVD is playing?
I have a 90-minute project (81 min. film and about 8 mins. of extras) authored w/ DVD Studio Pro to DVD-R, with the main film itself compressed using Compressor's "90 minute Best Quality" preset (average video bit rate of 6.2 Mbps and a maximum bit rate of 7.7 Mbps). However, when playing the burned DVD-R back on my home Pioneer tabletop DVD player (which displays bit-rate info superimposed on the TV screen), it shows the bit rate at the above levels but with occassional spikes as high as 8.8 Mbps (these spikes only last about a quarter second). So it sound like Compressor's "maximum" 7.7 setting really isn't maximum, unless the Pioneer's meter is wrong.
Now, really weird: when I play the very same disc on an older Toshiba DVD player which also has a bit rate meter, it shows average bit rates in the 8.5-9.8 range, with spikes as high as 10.0. I've tried playing the film back twice on the Toshiba and it has frozen twice, at different parts of the movie (and not during chapter breaks or markers). I've read that the max. bit rate for all DVD content (video, audio, subtitles, etc). is 10.08, and the max. for video is 9.8. The film I'm playing has no subtitle or other extra streams, just the single video and audio files.
I've played the film fine on 5 other DVD players, so maybe it's just the Toshiba. But the bit rate differences are puzzling.
My concern is that this disc play well on multiple players. As is, it fills 4.29 GB on the disc. Should I recompress the film at Compressor's 120 min. Best Quality setting to lower the bit rate?
Thanks.
Mike

Mike Boedicker wrote:
Anyone know why different DVD players would display drastically different
bit rates as a DVD is playing?
Any system measuring real-time performance is probably doing an estimate.
Doing an accurate measurement would take so much processing power that
the performance itself would be affected. So it's quite possible that
the numbers you're seeing are somewhat inaccurate.
That said, you seem to be pushing the limits of your test systems,
so maybe you should back off on your Compressor settings.
Check out hanumang's advice and silal's links here:
http://discussions.apple.com/message.jspa?messageID=5157012

Mediainfo wont give me the Max Bit Rate Capability all the time. Is there other information I can use to convert to obtain this? Thank you

Below is the information I received from Mediainfo. Is there a way I can figure out the the maximum Bit Rate Capability with this? Lately I have have had movies stop half way through and I think I think the MBPS is too large on some of them. On some moveies Mediainfo will give me the MBPS.
Thank you
Video
ID : 0
Format : MPEG-4 Visual
Format profile : Advanced Simple@L5
Format settings, BVOP : 2
Format settings, QPel : No
Format settings, GMC : No warppoints
Format settings, Matrix : Default (H.263)
Muxing mode : Packed bitstream
Codec ID : XVID
Codec ID/Hint : XviD
Duration : 1h 54mn
Bit rate : 2 060 Kbps
Width : 720 pixels
Height : 304 pixels
Display aspect ratio : 2.35:1
Frame rate : 29.970 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.314
Stream size : 1.65 GiB (90%)
Writing library : XviD 64

Hi, I just watched the video for the Microcell and you have to use your broadband connection to get it to work and the problem is my broadband connection is down the times I'm using my 3G. That's why I use it, because my broadband connection is not working so much of the time.
Any other suggestions? :-)
Martha

Best bit rate for blu rays with Toast 11

I'm burning a ProRes422 (uncompressed @ 18GB) movie to blu-ray using Toast 11 Titanium. The maximum bit rate is 9.0 Mbps. Is this sufficient? It seems very low...
Compressor has never worked properly with burning a blu-ray (I know there are more custom settings). I would use this but have had no luck, the blu-ray never burns properly only had luck with Toast.

Thanks for the info, somehow I've had to pay extra for the blu-ray plug in to burn a blu-ray at 26Mbps.
Now I need to figure out why the audio now is 'cracking' on the deeper parts of the soundtrack. The audio is set to PCM 96kHz 24 bit just like the original Pro Res file. In the original it does not 'peak' or 'distort' on the deeper parts of the soundtrack when playing in Quicktime, not sure what is happening to the audio after being burned to blu-ray. I might have to post in Soundtrack to get some feedback, any suggestions?

Bit rates in Compressor using H264

I have an HD media player that can only handle files up to 4GB (fat32). I need to compress 30 minutes of 1080P HD footage to around 3.6 GB. The problem I keep running into is the complex footage in the finished video.
I'm trying to create a H264 file with a variable bit rate and a maximum bit rate, does anyone know how to do this using compressor?

Thanks Thomas, I'm working with Jeff on this project. With your settings it does't quite work, The Data Rate is not really a peak constrained VBR, but its more of an average bit-rate. I've tried setting the Data Rate to 16000 kbits/s, but I'm not getting the quality output I need for some scenes.
Some scenes don't need more the 8000 kbits/s but others need more like 25,000 kbits/s. With the Automatic VBR I'm getting a mostly what I need, except one scene want to peak at 80,000 kbits/s. The player is limited to 30,000 kbits/s. Also like Jeff stated before the file size of the video must be less than 4GB so it will fit on CF card formatted at FAT32.
I need to be able to set a Average bit rate at around 15,000 kbits/s, with a Max peak at 28,000 kbits/s. Any one with ideas on how to do that?
To put this simply, we need the best possible quality with these specs.
*Codec: H.264*
*File size: <4GB*
*Average bit rate: 15,000 kbits/s*
*Max bit rate: 28,000 kbits/s*
Thanks

Low frame rate even with high bit rate

I am using a Logitech QuickCam Pro for Notebooks (the model that supports UVC per Logitech's website) with a new Mac Pro and iChat. Whether I do a video iChat over the internet or one within my internal network, the fps per the connection doctor of my camera is about 6 fps, even if the bit rate is over 2000 (which is what is was when I did the internal network chat). I can't find any setting where I can increase the fps rate, I can only increase the bit rate in the camera preferences in iChat.
The camera is capable of up to 30 fps and when I do a video recording with it in QuickTime Pro and play it back, QuickTime Pro shows the frame rate as 30. So the camera is connected properly and is working properly. Any ideas on how to get the fps up to 15 in iChat (which seems to be the maximum, per the MacBook Pro I used for my internet network test above)? Thank you.

Thanks for the reply, Tony. Changing the bit rate limit to 500 did not cause the frame rate to change. On my test with my internal network if I had the limit set to none then bit rate was over 2000 but frame rate was only 5-6. When I limited the bit rate to 500 it dropped while the frame rate remained unchanged a 5-6 fps.
When I was doing an internet chat I also changed the bit rate limit to be none, 500, or 1Mbps to see what would happen and the connection doctor showed my frame rate staying at 5-6 and my bit rate staying below 100 (so changing the maximum bit rate setting made no difference). Meanwhile, the person I was chatting with had a frame rate of 15 and a bit rate of about 250.
I'm on a cable modem just like the person I was doing the internet chat with, so I guess the problem is something to do with iChat and my Logitech web cam, not my internet connection.

Need math help, bit rates

Sorry, I know this should be in the compressor or DVD SP forum, but there isn't enough traffic there and I need this ASAP. Hope someone knows bitrate calculations well. I have a file. The total bitrate is 7.15Mb/s. THe audio is 224Kb/s at 48KHz ac3. what is the video average bitrate?
Streamclip tells me the video is 8Mb/s, so obviously it is a VBR file, cause if the entire thing is only 7.15, the video can't be 8 down the whole thing. So I need the average bitrate to match another file that I have yet to compress.
Matt
p.s. I wouldn't mind learning to fish as well, if you are so inclined...
Message was edited by: RedTruck

Hey,
Thanks for the reply. The file was given to me on a DVD. I have permission to rip and re-burn along with another file that I am creating. It is obviously MPEG2, but I already ripped and demuxed, so I now have the m2v.
I have another movie going on the same track (has to be a track so I can make a story in Studio Pro and have smooth playback for a presentation.)
Using MPEG Streamclip for diagnosis, the m2v is 8 Mbs. The audio file is ac3 at 224 Kbs. The entire movie clocked out at 7.15 Mbs. So I need to calculate the average bit rate for the video so I can encode my movie at the same rate.
The whole 1024 bits to bytes and 4.7GB on a disk which is actually 4.38... ah... bloowey... I can't figure out exactly the bit rate so they will fit in the same track. I am actually re-encoding her movie right now so I can just duplicate the setting. But I would still like to know how to get an accurate calculation for the future. I have had to do this before and I always wind up wasting time re-encoding.
Thanks for any help you can give.
Matt

Target & Max Bit Rate - A Little confusing Need file to be 15 GB Blu-Ray Help????

I have a 2 and a half hour project on PPro CS 5.5 that I want to encode in H.264 Blu-Ray. I want to get it to 15 GB.
What woud be the best settings to do so?
The Target Bit Rate and Max Bit Rate have a lot to do with it, but I am a little confused on what each of them really do.
I just want to get it to 15 GB and make sure the Estimated file size somewhat accurate.
Is 15 GB too big for a Blu-Ray?
Thanks in advance
PPro CS 5.5
Media Encoder 5.5.
Thanks in advance

Hi Jeff,
I just started to build just my menus with my QT files inside of them as a "Build to Folder."
I think I know why it's saying 7.1 GB used.
Since the menus in Encore stop and loop after 30 seconds, I did not like that.
I like to play a full song on each menu and then when the song ends, it starts again. If I did that on a standard 30 second menu in Encore, the song would stop every 30 seconds and start again. This was not acceptable to me.
This does not happen in DVD Studio Pro. In DVD Studio Pro, I can put in a full song with Videos in Video Zones, change the loop time to the length of that song, and the menu would play that song, and loop again when it was over.
I wanted to do this in Encore, so I had to make the menus a little longer than the song I wanted to put in them. I did that.
1) I went into After Effects with the background of the menu I wanted to use.
2) It comes in as a .psd file.
3) I then stretched it out to a length a little longer than the song. (For exaample, I'm using a song that is 4 minutes and 50 seconds, so I stretched out the background of that menu to 5 Minutes.)
4) I then rendered out that newly made 5 minute menu out of After Effects, using H.264 1440 x 1080i, 29.97 High Quality.
5) I then brought that newly made 5 minute background back into Encore and placed it over the original 30 second background in Encore.
6) Now the song and the videos inside the "Video Drop Zones" will loop until the song is over, stop, then the song will start again and the videos keep on looping. Just like in DVD Studio Pro
For this particular job I did this 6 times (1 for each sub-menu) depending on the length of the song I am using for each menu.
1) The first sub-menu is a 5 minute menu which, when rendered in After Effects, came out to be 1.5 GB Big
2) The second menu is a 4 minute menu which came out to be 1.2 GB
3) The third is a 4 and a half minute menu which is 1.35 GB
4) The fourth is a 3 and a half minute menu which is 1.05 GB
5) The fifth menu is another 4 minute menu which is 1.2.GB
6) The sixth menu is a 7 minute menu which is 2.1 GB.
When you add them up it actually comes out to be 8.4 GB just the menus without any videos in them.
So Encore has already compressed them down a little.
It's not the videos that are taking up much space, but these menus.
Since I am building my job in Encore to a folder, I want to see what the actual size comes out to be after it's compressd. This will give me an idea of how big I can make my 2 and a half hour wedding. The Target and Max Bit rate.
I hope that sheds some light on why Encore is saying that the menus and QT files are taking up 7.1 GB already.
I wish there was another way that I can have my menus play for the length of any song without having to go into After Effects and stretch each menu to accomodate the length of a particular song. This takes up a lot of space, but it's the way I like to make my menus.
Thanks again

Maximum Bit Rate help

Similar Messages

Maybe you are looking for