Adjust bit rate on movie replay

When I go to YouTube to view videos on my PB G4, I can adjust the streaming bit rate from 480 to 360 to 240. I need to play at 240 on my unit in order to keep the video clip streaming without halting, probably due to my limited RAM capacity of 1.25 mb.
When I view videos on other sites, I cannot find a bit rate adjustment in the video box, and most of the time, the video playback is halting and stuttering. Is it possible to adjust the bit rate on my computer screen another way?
Thank you

This is very interesting isn't it !
I have had a similar problem in porting audio between STP & Pyramix, a PC based DAW - often files that I have exported from STP will be recognised as 32 bit files in Pyramix, resulting in gross distortion, and a totally unusable file. This is most frustrating.
I really have no idea what is happening, but believe it must be to do with the way STP handles audio. Another observation is that if you look at a .STAP file in windows explorer, you will see some interesting things - mainly that it is not a "file" more of a directory, containing for example:
a) the audio file
b) an effect file (if you've got some effect on it, or have spliced it etc)
c) a Metadata file
d) and a render file
Perhaps this has something to do with STP wanting to change the wordlength of the audio that it is handling ???
Anyone ???

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Hello Board,
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Thanks,
CR

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Also, can you mention the exact method of getting to Compressor? That is, are you sending directly from FCP (File > Export > Using Compressor) or are you exporting a QuickTime Movie?
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Hi,
I'm having two issues I'm hoping someone can help me with..
1) My file sizes are much bigger than they're apparently supposed to be. A 10 second clip at 720x576 takes up 32 MB. I've tried both quicktime h.264 and various avi codecs with roughly the same results. A larger 3 minute clip takes up over 500 MB. This is at 100% quality setting. I was told that they shouldn't take up more than 10% of that size so I'm not sure what's going on..
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This is for web use, but mind you there are plenty of sites that offer hd video so it's not a particularly high resolution..
I just don't understand why these files are so big considering the maths.
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Is my bit rate too high?!

I'm new to DVDSP but thought I'd figured it out. I'm burning a 30 minute film, with 13 chapters, to HD-DVD. The simulation works fine, and the build and format seems to go through fine, but the resulting dvd works only on my computer (that I burnt it on).
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http://www.videohelp.com/calc.htm
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1. Export out an uncompressed or lossless 720x480 16x9 Anammorphic @ 23.98 (4444 is a waste since you're not dealing with any Alpha Channel for the encoding)
2. Determine how many minutes you have and find the optimum bitrate with the calculator
3. Plug your file into Compressor and set the correct bitrate and Encode
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Bit Depth and Bit Rate

I have a pre recorded mp3 VO. I placed it into a track bed in GB. Clients wants a compressed audio file with bit depth: 16 bit and bitrate: 128kps max, but recommends 96kbps. If I need to adjust the bit depth and bite rate, can I do it in GB? and if so, where? Thanks for any help.

Please be aware that Bit Depth and Bit Rate are two completely different things!
They belong to a group of buzz words that belong to Digital Audio and that is the field we are dealing with when using GarageBand or any other DAW. Some of those terms pop up even in iTunes.
Digital Audio
To better understand what they are and what they mean, here is a little background information.
Whenever dealing with Digital Audio, you have to be aware of two steps, that convert an analog audio signal into a digital audio signal. These magic black boxes are called ADC (Analog Digital Converter) and “on the way back”, DAC (Digital Analog Converter).
Step One: Sampling
The analog audio (in the form of an electric signal like from an electric guitar) is represented by a waveform. The electric signal (voltage) changes up and down in a specific form that represents the “sound” of the audio signal. While the audio signal is “playing”, the converter measure the voltage every now and then. These are like “snapshots” or samples, taken at a specific time. These specific time intervals are determined by a “Rate”, it tells you how often per seconds something happens. The unit is Hertz [Hz] defined as “how often per seconds” or “1/s”. A Sample Rate of 48kHz means that the converter takes 48,000 Samples per second.
Step Two: Quantize (or digitize)
All these Samples are still analog, for example, 1.6Volt, -0.3Volt, etc. But this analog value now has to be converted into a digital form of 1s and 0s.This is done similar to quantizing a note in GarageBand. The value (i.e. the note) cannot have any position, it has to be placed on a grid with specific values (i.e. 1/16 notes). The converter does a similar thing. It provides a grid of available numbers that the original measured Sample has to be rounded to (like when a note get shifted in GarageBand by the quantize command). This grid, the amount of available numbers, is called the Bit Depth. Other terms like Resolution or Sample Size are also used. A Bit Depth of 16bit allows for 65,535 possible values.
So the two parameters that describe the quality of an Digital Audio Signal are the Sample Rate (“how often”) and the Bit Depth (“how fine of a resolution”). The very simplified rule of thumb is, the higher the Sample Rate, the higher the possible frequency, and the higher the Bit Depth, the higher the possible dynamic.
Uncompressed Digital Audio vs. Compressed Digital Audio
So far I haven’t mentioned the “Bit Rate” yet. There is a simple formula that describes the Bit Rate as the product of Sampel Rate and Bit Depth: Sample Rate * Bit Depth = Bit Rate. However, Bit Depth and how it is used (and often misused and misunderstood) has to do with Compressed Digital Audio.
Compressed Digital Audio
First of all, this has nothing to do with a compressor plugin that you use in GarageBand. When talking about compressed digital audio, we talk about data compression. This is a special form how to encode data to make the size of the data set smaller. This is the fascinating field of “perceptual coding” that uses psychoacoustic models to achieve that data compression. Some smart scientists found out that you can throw away some data in a digital audio signal and you wouldn’t even notice it, the audio would still sound the same (or almost the same). This is similar to a movie set. If you shoot a scene on a street, then you only need the facade of the buildings and not necessary the whole building.
Although the Sample Rate is also a parameter of uncompressed digital audio, the Bit Depth is not. Instead, here is the Bit Rate used. The Bit Rate tells the encoder the maximum amount of bits it can produce per second. This determines how much data it has to throw away in order to stay inside that limit. An mp3 file (which is a compressed audio format) with a Bit Rate of 128kbit/s delivers a decent audio quality. Raising the Bit Rate to 256bit/s would increase the sound quality. AAC (which is technically an mp4 format) uses a better encoding algorithm. If this encoder is set to 128kbit/s, it produces a better audio quality because it is smarter to know which bits to throw away and which one to keep.
Conclusion
Whenever you are dealing with uncompressed audio (aiff, wav), the two quality parameters are Sample Rate [kHz] and Bit Depth [bit] (aka Resolution, aka Bit Size)
Whenever you are dealing with compressed audio (mp3, AAC), the two quality parameters are Sample Rate [kHz] and Bit Rate [kbit/s]
If you look at the Export Dialog Window in GarageBand, you can see that the Quality popup menu is different for mp3/AAC and AIFF. Hopefully you will now understand why.
Hope that helps
Edgar Rothermich
http://DingDingMusic.com/Manuals/
'I may receive some form of compensation, financial or otherwise, from my recommendation or link.'

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.

Controlling output video bit rate in FCPX

I ran into a problem: I created a mp4 file with Share/Export File… (settings: Computer, H.264 Faster Encode, 1920x1080 - edited from an HD camera): its video always freezes at a definite point when played on my BD Player connected to my HDTV through HDMI (audio instead continues on the frozen image).
It seem that the issue is a sudden video bit rate pick of almost 50 Mbps while its average is around 20-30 Mbps. It is not clear to me if this freeze is caused by the BD Player or by the HDTV not being able to handle such pick.
As a test I used Compressor to control the output bit rate (settings: average 20 Mbps and pick 25 Mbps) and this seems to fix the problem. To be more certain I should do more tests, but I'm confident I found a possible solution.
I'd like to know if there is a way in FCPX to control such picks (without using Compressor), either in the Share commands (but it seems to me that they don't provide enough setting controls) or in the timeline. By watching the Video Scopes I can see a quite strong signal in the area where the output file has the bit rate pick. But I don't know any way to have a measure useful to identify them before sharing and avoid a trial and error approach...
Piero
Below the critical point...

Tried to upload a PDF instead of PNG, but no luck. The picture shows a quite standard (I'd say...) image but with highly dense graphic of Y' component in the Y'CbCr Parade (in the limits of 0-100 IRE): much more dense than most images in the rest of the movie. So I assume this might mean a higher bit rate... but it's just an assumption.
Let me summarize my tests:
1st test: FCPX: Share/Export File.. (settings: Computer, H.264 Faster Encode, 1920x1080)
- copied the .mp4 file to USB drive
- USB drive into a BD player connected to HDTV through HDMI >> freezing effect
2nd test: FCPX: Send to Compressor - Compressor: Create Blu-Ray Disk (on Hard Drive) and Video Job with standard Video settings (Automatically select bit rates = ON)
- Played the .img disk with "Mac Blu-Ray Player" on my iMac >> same freezing effect in same position as before on HDTV
3rd test: FCPX: Send to Compressor - Compressor: Create Blu-Ray Disk (on Hard Drive) and Video Job with customized Video settings: Automatically select bit rates = OFF - Average = 20 Mbps - Maximum = 25 Mbps
- Played the .img disk with "Mac Blu-Ray Player" on my iMac >> NO MORE freezing effect (and smaller file by 30%)
I might do more tests (mainly on my HDTV) but I believe the point is the bit rate... and the only way to control it is by using Compressor.
So now my question: is there a color setting that helps in controlling such situation ? e.g. lower saturation, or lower exposure, maybe in mid tones or highlights, or what ?
Thanks so much for your help
Piero

HT4914 I have an iTunes library of some 18k tracks. If I subscribe to iTunes Match, can I delete my library from the pc hard drive and then download my entire collection back at the higher bit rate of 256?

I would like to improve the quality of my iTunes library, most of which were ripped at the old 'higher quality' setting and not lossless.
I would consider subscribing to the iTunes Match programme if I would later be able to download my music back on to my PC at the improved higher bit rate stated.
Is there a problem with this?

In iPhoto, Select All the Photos you want to move... Then goto > File > Export >
Choose the settings as seen here
Click Export and select your External Drive
Best to create a Folder to put them in... and away you go...

Adjust bit rate on movie replay

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