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  1. 14th Jan 2004 01:30 #1
    ewharding2000
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    Hello!

    I have a question about bitrates on a AVI to MPEG2 to conversion. When I check the bitrate in VirtualDUB, it says that it is 995 BPS in the AVI. When converting to MPEG can I lower the bitrate setting in TMPEG to around the same amount without losing quality?

    Thanks for your time,

    Eric
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  2. 14th Jan 2004 02:01 #2
    mats.hogberg
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    No. The AVi bit rate and mpeg bit rate are not related at all. The higher bit rate you use when encoding, the closer to the source material quality you'll get (but never really 100%).

    /Mats
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  3. 14th Jan 2004 05:50 #3
    daamon
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    Hi ewharding2000,

    I found this guide:

    http://dvd-hq.info/Compression.html

    ...really useful for my TMPGEnc settings. Explains them in good detail.

    Hope that helps.
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  4. 14th Jan 2004 06:54 #4
    bugster
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    As your avi is almost certainly some form of mpeg-4 variant (divx, xvid etc), which uses much higher compression than mpeg-2, you in fact need to signficantly increase the bitrate to even get close to the quality of the source. You also have to take into account any resizing being done. If the mpeg-2 is higher res than the source avi (say 720 * 480 mpeg for DVD Vs 640*480 4:23 avi), you need to increase the bitrate a corresponding ammount to compensate for the extra data required to represent the extra pixels.

    From a good quality divx (no more than 1 hour per CD), quadruple the bitrate when going to DVD as a starting point.
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