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Gear / Technical Help => Photo / Video Recording => Topic started by: SClassical on February 18, 2009, 12:02:54 AM
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If I have to pick either one or the other which sound recording is best to DVD???
Either 24bit 44.1 kHz OR 16bit 48kHz
(I know the advantage of using 16/48...People can watch it using Windows Media Player because WMP cannot playback 24bit audio).
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dvd video HAS to be 48 or 96. it can not be 44.1
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Actually I put a 16 44.1 audio on the audio time-line and it works using Vegas 8. The audio was not resampled it stayed as 16 44.1 after making the DVD.
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48 kHz sample rate is the digital video standard. Why ask for trouble using anything else? If he original sound is recorded at 44.1, just convert to 48 kHz before using it. Editors might do it automatically when you render the video/audio without telling you.
Nobody will ever hear any difference between 48 and 96 kHz sample rates on DVD, scrap 96.
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Actually I put a 16 44.1 audio on the audio time-line and it works using Vegas 8. The audio was not resampled it stayed as 16 44.1 after making the DVD.
44.1KHz will play on the timeline in Vegas with no issues but if you render it to standard DVD it will resample to 48KHz. DVD cannot be 44.1KHz and even if you have that by some off chance it is not a standard DVD and cannot be guaranteed to play.
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I would say it would depend on the final product and how you are assembling it. If you are recording the audio seperate, I would say 24/48 (I know it wasn't an option listed, but there wasn't any discussion as to how it was being recorded/assembled) so you have maximum control of the audio portion. At some point you will have to go to 48 anyway because as mentioned, it is the standard for DVD audio. If you are doing seperate audio you can adjust the volume with less noise recording 24 bit and work with the audio seperately to make it as nice as possible. If the above are the absolute only options, I would would say 16/48 for general ease in creating a DVD.
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If you go with 24/48, you will have to lower your sample rate on the video, right? Or maybe use VBR for your project. I've always used CBR for video.
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9.8Mbps is the max to keep to DVD standard. That includes video and audio. 16 bit/48KHz PCM WAV is 1536kbps. 24 bit will be slightly higher but I don't know the exact figure. If you use 24/48 bit you'll need to know the exact bitrate and take that into consideration when calculating the vido bitrate.
CBR vs VBR really depends on how much you want to fit on a disc. 1 hour or less I definitely go with CBR. It also depends on what the material is. High motion video will need more information to keep it from degrading. I film beauty pageants and weddings often which are very low motion and can easily fit 2 hours on a disc in VBR and quality is perfectly suitable. I wouldn't dare try to fit 2 hours of handheld shots because quality would definitely be diminished.
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As a closing remark I say that it is a total waste of bandwidth to use 24 bit audio on a DVD. Two reasons:
1) I would bet anything that there is no video or film (even $$$$$$$ film) where the total audio chain is 24 bit resolution. Mics are not, ambience is not, recorders are not, mic-preamps are not... It would have to better than a gloriously recorded classical CD to make it worth your while.
2) Even if the point 1) does not hold, I further bet that nobody has (ok, maybe 5 systems in the world) reproduction systems and rooms where they could fully utilize more than 16 bit resolutions. 16 bits gives over 96 dB dynamic range, for Pete's sake. With even really low room noise levels around 30 dB SPL that would mean over 120 dB SPL peaks!
Get real and use the bandwidth where it really counts: Video quality (less compression there).
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Stick to 16/48.