Difference of 3.3 Mbps bit rate burn vs 4.7

Is it easy to see the difference between these two encodings? Reason I ask, I finally got a what looks to be pretty quality burn from my 2 hour project encoded at 3.3 Mbps. I read if I encode the audio to AC-3 I can go to a higher bit rate. Will the quality be that much better? I have not yet watched the whole project but it looks pretty good as is. But if it will look even noticeably better with a higher bit rate as a result of compressing the audio I can install compressor, learn to use it and re do the burn.
On another note, will I be able to hear the difference in the audio after it is compressed to ac-3, as I would imagine there would be some quality loss in the compression(?).
3: In the burn I used Constant variable rate, and not 2 pass variable rate. The reason is I was not sure if it would fit on my dvd. Should I try to go for the 2 pass variable rate? My project has equal mix of action and talking heads, however the action is not extremely fast or anything.
4: I used 4.7 in the title randomly. How much higher could I go in the burn bit rate as a result of compressing the audio approx?
Thanks for any info.

You might see a difference - depends on the source footage but thats for you to determine. Do a test.
Using ac3 is a good idea since allows at least 1mb/s jump in your encode rate for video. This is much more important than audio since most don't have the installation to hear the difference between compressed and uncompressed files. The only time I'd use un compressed files is if the project /clients demands the fidelity (like a concert or music title).
Yes...use VBR for when space might be an issue. According to my calculation you can use a VBR target encode rate of 4.8 or so with a peak at around 8.

Similar Messages

Sound quality: If you want to hear the difference between higher and lower bit rates

Have you ever wondered about the difference in the sound quality of music at different bit-rates? Can you hear the difference?
If you listen to 64kbps and 28kbps (either wma or mp3), you'll hear the great difference. However, if you listen to 28kbps and 92kbps (either wma or mp3), you'll find that there is little or no difference (to me, that is).
collegeboy wrote:
We all know that wma 28kbps sounds just as good as wma 320kb
ps.
the reason i and you go higher than 28 is because where able to. you can deny all you want.
If you want to experience better sound quality at higher bit-rates, the best thing to do is to listen to the music at a quiet place. This may sound like lame advise, but it really works. Try 320kbps for the best results. You'll be able to hear minor details you never had before.

SSR wrote:
Wayyyyyy back when I first started encoding MP3s I was using 28 with an inferior encoder. At the time I couldn't spot the difference, but now the difference is stark. Particular types of music (and more specifically instruments and combinations) do emphasise it though.
Actually, you cannot hear the difference when the background noise is loud, or example, public transport. I suggest that one uses a noise cancellation headset. $$$

Burning iTunes Plus and other 256 bit rate material to get best quality?

I understand that iTunes Plus and most songs on Amazon are provided at a higher bit rate than non-Plus iTunes songs in order to provide higher audio quality on playback. But, does this quality differential come through when burning a song to disc from within iTunes?
I ask because of an experiment I just conducted. I downloaded the same song from iTunes (not a Plus version) and from Amazon. The Amazon version takes up twice as much file space as the iTunes version. (The ACC file at 128kbps was 5MB while the MPEG file at 256 kbps was 11.6MB.) However, when I burned both songs to a CD, those files where identical in size. Further, when played on a near-audiophile stereo system, I could hear no discernible difference between the two.
So the question: Does whatever extra information and hence sound quality contained in the Plus or other 256 kbps material get lost in the conversion to audio CD format? Are there settings in iTunes I'm missing? Are there alternative software or file formats available that would burn audio CDs without this loss?
(I realize that whatever difference there is in sound quality would not be detectable on most equipment. What I'm looking for is to preserve quality differences that can be heard on high-end equipment. As it is, I'm able to tell the difference between well-recorded and produced commercial CDs and the same material bought through iTunes.)

The quality of compressed audio is not always linked to file size. I believe it is possible for a 128 kbps AAC file to sound as good as a 256 kbps MP3 file. MP3 is not the best audio compression format but it is by far the most commonplace. A 128 kbps AAC file isn't as good as a 192 kbps AAC file, however.
When your audio files were uncompressed for burning to audio CD they naturally became the same size because there no longer was any compression.
If your objective is to have audio CDs that sound best on high-end equipment then you should continue buying audio CDs rather than purchasing on-line music. That way there is no loss in audio quality from compression. I'm not aware of a source that is selling lossless on-line music downloads.

Video bit rate too high when try to build and burn. Audio is AC3

I am trying to burn a dual layer DVD and when I go to build/format the DVD it says that the video bit rate is too high. I am confused by this because this DVD was burned previously without a problem. Changes had to be made to the project and the files were compressed in compressor with the same settings and now they do not work. The audio is AC3 dolby. Is there some setting that needs to be changed in DVDSP? What am I missing here...
I am using FC Studio 2.
Thanks!
Natalie

I don't know exactly what the total length of the video is in minutes, but I do know that it is 6.8GB for a dual layer. Probably at least 3 hours. I don't know what the target bit rate is? Is what you are referring is to what the compression I used in compressor?
I am using the setting DVD Best Quality 150 minutes 3.7mbps for video and the AC3 for the audio.
I am recompressing all the videos again just in case there was a problem with one of the compressions. I don't understand why it isn't working this time when none of the settings or compression had changed.
Thanks!!

Bit Rate Too High error message when I try to burn 3 minute DVD

I imported a Quicktime Mov from FCP, and when I try to burn to DVD, I get this message.
This has me worried, becuase this 3 minute part is only 1/3 of the whole piece that I am trying to run as a test to check contrast, color balance etc.
I'm not sure what the bit rate is, how to change it or what to change it to.
I don't know if I need to do this in FCP or in DVDSP.
Any help would be appreciated.
J.

http://dvdstepbystep.com/faqs_3.php
Then
http://dvdstepbystep.com/fasttrackover.php to A.Pack Dolby the audio (when you scroll to the bottom there is a link to a movie showing all the steps, about 1 minute or so in you will see Compressor, you can download and scroll to that pint to bypass the Final Cut section)
And make sure to compress the movie outside of DVD SP in Compressor
Basically there is only so high the bitrate can go, regardless of running time of video. If you use one of the presets in Compressor you should be okay as long as you use the A.Pack/AC3 and not the audio

Burn voice mp3 play list to audio CD. convert bit rate or sample rate.

I have several audio files (voice), 30 in all, that I wish to play in a car CD player.
The car player cannot play mp3. Using iTunes I tried buring a play list of mp3 files to an Audio CD.
I get an alert from iTunes that I may require multiple CD's. Each mp3 file is around 90megs in size or about an hours worth of audio (voice).
The audio files are voice no music. But they are at 192 kbps bit rate and 44 khz sample rate.
Is there a way of converting them to squeeze more files onto a CD? Changing bit rate or sample rate?
Can itunes do that? Or is there a utility that can do that?
thanks

Now that memory serves me right. CDs have the MB size and the Minute size on them. example 700MB/80Minutes.
How we forget...
Thanks though

How to resolve audio sampling and bit rate differences before sound mix

I'm editing a project where an additional recorder (Zoom H4n) was used and synched to the camcorder track with Plural Eyes. Some of the sampling and bit rates don't match within the Plural Eyes synchronized clips and I need to send this out for a sound mix. Could I use Compressor to transcode the audio? Would I have to go back to my original separate tracks, transcode in Compressor and then re-synch using Plural Eyes? Next time ProRes from the beginning -
but if there's an easier fix for my current problem it would be much appreciated.

Thanks Michael -- you've helped me with the project before (back in May of this year).
I started this project as a newby back in 2010 and was a bit overwhelmed (i.e. just happy to get everything into FCP and be able to edit.)
I'll try the media manage solution, but if that doesn't work I think I'll live with the one-frame drift. I'm assuming
the only other alternative would be to go back to all the original video and audio files; transcode using Compressor, and then re-synch with Plural Eyes and go back in to match up the edits?
Thanks to your continuing help, I should know how to set things up correctly from the get go for the next one!

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

Problem with bit rate ?

Hi there,
Using FCP7.
After compressing a FCP project with Compressor and burning DVDSP with DVDSP, I realized that scenes containing objects or people in rapid movement where showing jerked images.
The slow motion scenes are fine.
I checked the following
settings for DVDSP burning: VBR two pass;
averageBit rate 4,0,
max rate 7,0
1) the self-contained QT that I started with is not showing this problem.
2) the m2v file obtained from compressor (I use preset setting for high quality compression) does not show this problem when I view it with MPEG streamclip
3) I tried to burn directly the QT file with Toast 10 …get same problem if not worse !.
settings for Toast
automatic re-encoding
average rate 4,0 Mbps
max bit rate 8,0 Mbps
MPEG-2
I guess my problem comes from the bit rate I used ?
I am now confused and I am not sure I understood the impact of the bit rate setting on the quality of the resulting DVD, and I believe that using a high bit rate in DVDSP might result in problems for some clients to play the DVD on their player ?
Could it be something else ?
could someone please give me advice ?
Many thanks in advance
Ivan

I can only think of two possibilities based on the info available:
1. Old DVD player (choking on the bitrate spike)
2. You need to set some compression markers around the scenes while in FCP. This would flag Compressor to pay extra attention to that area. After you output the new clip, I suggest you use the standard High Quality preset (in Compressor) for your program duration e.g., "Highest Quality 90 minute". Don't get creative with the encoding set-up. And ALWAYS used AC-3 audio.

Can no longer change bit rate in AAC custom import settings

I've been re-ripping all my CDs at the new higher bit rate. My import settings were AAC Encoder -- custom, originally set to 256 kbps, VBR, and auto for the other two settings. However, some CDs I wanted at a lower setting, so I would go change the bit rate to either 192 or 224 (just so I'd have more room on my ipod) and there wouldn't be a problem. But now it's stuck -- the pop-up box no longer opens when I choose import settings, AAC Encoder, Custom, so I can't change the bit rate or anything else, and it's stuck on 224 kbps. I can still change bit rate and other settings in the custom menus for MP3, WAV, etc., just not AAC. A repair install of iTunes did not fix the problem.

Hi, Ed. I am running iTunes 9.0.3.15. When I click custom, the settings description in the details box display what they were before this thing happened = 112 kbps (mono)/224 kbps (stereo), VBR, optimized for MMX/SSE2. The pop-up dialogue box that used to appear (where you could choose the specific bit rate from the drop down menu) does not appear at all.
However, when I choose anything other than AAC Encoder, and then pick custom, the pop-up box appears and I can choose the bit rate and adjust the other settings as usual. It's just not happening for AAC Encoder anymore. Since the total un-install (following Apple's specified order) and reinstall didn't work, I'm baffled how to fix this .... (If it makes a difference, I changed the bit rate in the custom box while a CD was being burned...Apparently that was stupid, but I had done it previously without incident.) Thanks.

Better compression at lower bit rates

I've not had much luck getting good h.264 compression from AME at lower bit rates. Are there some secrets that someone has shared? I used to be quite adept back in the day, so it's frustrating having to upload giant files to Vimeo. Any good guidance?
I should be more specific. It seem like close to 5 Mbps is need for full HD, but I remember Flash expert Fabio getting great results in less than 1:
http://sonnati.wordpress.com/
It would be great if AME had some addition controls.

SSR wrote:
Wayyyyyy back when I first started encoding MP3s I was using 28 with an inferior encoder. At the time I couldn't spot the difference, but now the difference is stark. Particular types of music (and more specifically instruments and combinations) do emphasise it though.
Actually, you cannot hear the difference when the background noise is loud, or example, public transport. I suggest that one uses a noise cancellation headset. $$$

Can no longer change bit rate in AAC custom import setting

I want to change personal settings of AAC, but I can't. Still only the last setting, that was 192 Kbps Stereo. My iTunes version is 10.7

Hi, Ed. I am running iTunes 9.0.3.15. When I click custom, the settings description in the details box display what they were before this thing happened = 112 kbps (mono)/224 kbps (stereo), VBR, optimized for MMX/SSE2. The pop-up dialogue box that used to appear (where you could choose the specific bit rate from the drop down menu) does not appear at all.
However, when I choose anything other than AAC Encoder, and then pick custom, the pop-up box appears and I can choose the bit rate and adjust the other settings as usual. It's just not happening for AAC Encoder anymore. Since the total un-install (following Apple's specified order) and reinstall didn't work, I'm baffled how to fix this .... (If it makes a difference, I changed the bit rate in the custom box while a CD was being burned...Apparently that was stupid, but I had done it previously without incident.) Thanks.

What are the Bit Rates of the Music Store and Podcasts?

What is the bit rate quality and format of a song downloaded in the Music Store? And podcasts? Are they perfect, Apple Lossless quality or what...?

This might be true, but you won't experience any improvement in sound quality. Here's some info on bit rates:
This was originally posted by the incredible Sparky the wUnderdog
"As a general principle, you can fit more CDs on your iPod if you encode at lower bitrates (making smaller files), but at the cost of audio quality. Lossless promises to capture all the data on the original CD (thus preserving quality) but coded so the file takes half the space. MP3 and AAC (an implementation of variable bit rate MP4) both eliminate some of the information on the CD in order to compress the digital recording into ever smaller files--the lower the bitrate, the smaller the file, but smaller files mean more information lost and consequent poorer sound quality.
iTunes's MP3 encoder is so-so; the LAME encoder is better at preserving sound fidelity to the original. AAC files ripped in iTunes certainly sound better than its MP3s, with audio quality close to the best LAME MP3s at higher bitrates. With the type of music I listen to most often, sound quality declines substantially as bitrates fall below 256kbps, but LAME or AAC @ 256kbps sounds pretty darned good, and at 320kbps LAME alt-preset-insane is amazingly faithful to the original. However many users claim that with the music they listen to they can't hear the difference between 192 or even 128 kbps files and the original CD source, so they naturally choose higher compression rates to fit more "songs" on their iPods.
CDs take approximately 10MB per minute of music; Apple lossless takes 5MB/minute; LAME insane takes 2.5MB/min; AAC or MP3 at 256kbps take 2MB/min; and iTunes Store files (AAC@128kbps) take 1MB/min. At these rates, a 20GB iPod (really 18.6GB) can hold anywhere from 30 hours to over 300 hours of music. (iPod marketers express this potential playback capacity as "songs," figuring 4 minutes per song--thus 300 hours at 128kbps = 4500 "songs.") You will need to listen to samples ripped with different bitrates and codecs to determine the optimum tradeoff point for you between quality & quantity. It's worth taking some time to do this at the start as it sure beats reripping everything in your collection 2 or 3 times to get it right later.
So far as convenience goes, nothing beats iTunes's one-step process. To change bitrate as you import from CD, go to the iTunes menu > Edit > Preferences, select the Importing tab, choose AAC or MP3 encoder in the "import using" selection box, then choose "Custom" in the "setting" box, and the window permitting bitrate selection will pop up. If you choose iTunes MP3 encoder, at least use VBR (variable bit rate) to maximize the sound quality. (VBR increases sample size as data complexity increases.)
If you would prefer LAME MP3s, fear not, for the easy-to-use CDex ripping software is a free download and requires only one simple extra step to get the files into iTunes for transfer to your iPod. Now if AAC sound quality is comparable to LAME MP3, you might wonder why you should even consider LAME: Because of portability to other devices. At present, hardly anything but iPods can read AACs or Apple Lossless, but almost everything reads MP3s. So if you plan to burn CDs of your compressed files for playback on your home or car CD player (for instance), it would be wise to choose MP3.
One other consideration specific to the iPod: It has a 32MB cache. If you choose a compression rate that results in large files (i.e. lossless), then the cache won't hold very much 'music' and the hard drive will have to spin up frequently to fill it, and that will shorten your battery life somewhat."
JC

Bit rate problems

Re: Video bitrate too high
Posted: Sep 5, 2006 7:50 AM in response to: Rikk Desgres
Reply Email
Hi,
I have exported two 10 minute HDV movies as mpeg2 files, using Compressor, with the default bit rate setting of 6.2/7.7 mbps. When I try to burn a DVD, I get the "bit rate too high error message". I've used the same settings for these files before, and no problem. However, after I made minor changes to these files in FCP, and then tried to export - no luck. Should I try to export reducing the bit rate in Compressor?
Janis

A data rate of 160 or 192 is usually good, you should set Dialog Normalization to -31, preprocessing to none and dechecking Copyright Exists and Content is Original also helps prevent glitches (I had that drilled in my head awhile ago, like in DVD SP 1 time and sort of just follow it as a matter of course, pretty sure it still holds true through DVD SP 4 and Compressor 2, at least it has for me.)

Bit rate for all computer?

Hi all,
I'm burning a DVD in DVDSP 4, I burned and tried it in my MacBook Pro and on normal DVD player and It works perfect, the problem comes when I play it on some not so new PCs, in one of them the buttons (text and silver frame) in the menu seem to repeat in different positions, and in the other computer it plays fine but the audio doesn't work and sounds kind of static... does it have something to do with the encoding bit rate in DVDSP? maybe in Compressor??
HDV material / compressed with DVD best 90
SD DVD/PAL
Bit rate in DVDSP 5.0 Mbps
Max Bit rate 6.2
Appreciate your help!
Javier

Which Windows program was used to play the DVDs? Hopefully not Windows Media Player.
-DH

Difference of 3.3 Mbps bit rate burn vs 4.7

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