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Print at May 30, 2020 8:31:06 PM
|Posted by LongJohnGrey at Apr 28, 2004 5:24:22 AM|
Re: How to Create Videos
Thank you, actually. I was not aware that the audio was distorted that badly if decoded and reencoded.
However, I'm thinking more of the video compression. MPeg 2 video (is that layer 1, btw?) can be compressed faster than MPeg 4 video (at least for DivX). MPeg 2 can be done in "real time" (encoding at say, 20-30 fps), while DivX gives me about 8-12 fps.
If I wanted to take a movie of myself playing some of the puzzles, with commentary (hence the audio), so that my officer's could give me feedback on what I'm doing badly, then I need to capture enough fps of video; I can then use DivX to make it small enough to transfer. VirtualDub at least allows me to copy the audio over unchanged, so it won't get any artifacts, and for voice over a cheap microphone, I'm not sure it makes that much difference anyways.
But I do want to thank you for that ... research paper / term paper posting (:-) [had to say it, couldn't resist]
Oh -- video wise, converting MPeg 2 to MPeg 4 doesn't distort that badly. At least, not for a single pass. Repeated Divx re-encoding does worse. [Divx is like VHS -- a prime copy is good, a copy of a copy is ok, and third generation is noticably poorer. At least, for the older 4.x codec series.]
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