On Wed, 27 Feb 2008, Stan Gammons wrote:
> I tried this using the latest CVS of mjpegtools on a video capture from
> satellite TV using the ADVC-110. Video was 84,120 frames long. Average
> bit rate indicated was 5,017,600 Peak bit rate was 9,274,800 The file
> length was 1,706,553,307
For standard definition TV and a clean (no static) signal between
5 and 6Mb/s is perfectly adequate so the average you're seeing is fine.
It's a good 2hr of video on a DVD value.
The peak rate is probably from the beginning of the encoding - the
encoder starts with 0 and overshoots for a few frames and then
settles down. Nothing to worry about.
> I have not yet made a DVD from this to see what it looks like. I'll try
> to make one later today.
You could also play the .m2v file on the computer without having
to make a DVD - that;s useful as a quick check
> I noticed, as the info lines were scrolling by, some of the q= numbers
> were rather high at times. 62.00 is the highest I saw. EVERY time I saw
Yep - that bug's still present. The frequency of huge values
was reduced but the problem still happens. When it does the picture
quality goes to almost null and the bitrate plummets - that is
probably why your average rate is somewhat lower than I'd expect.
> So I still don't know if the problem is fixed or what.
No, it's not. It is somewhat less severe than it was. Since it is
unpredictable when the problem will happen I guess you'll have to
go back to an earlier version (just keep going back until the
problem goes away ;)) OR use an alternate encoder. Seems that at
least 1 windows encoder will run using Wine. There's also the
TMPGEnc encoder (http://www.tmpgenc.net/en/index.html) - it is where
the 'tmpgenc' quantization matrices were obtained for use with mpeg2enc.
Maybe TMPGEnc runs under wine? Don't know - I've my encoding needs
met in other ways.
Good Luck!
Steven Schultz
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