On Mon, 23 Jan 2006, Bob Stia wrote:
> OK ran mplex again with the new shifted.ac3. At least it did not fail
> immediately. Here is the result:
Something's a bit weird with the input video I think:
> EasyStreet:/workspace # mplex -f 8 -o "movie.mpg" shrink.m2v shifted.ac3
> INFO: [mplex] VIDEO STREAM: e0
> INFO: [mplex] Frame width : 720
> INFO: [mplex] Frame height : 480
> INFO: [mplex] Aspect ratio : 16:9 display
> INFO: [mplex] Picture rate : 29.970 frames/sec
> INFO: [mplex] Bit rate : 9800000 bits/sec
> INFO: [mplex] Vbv buffer size : 229376 bytes
Right up against the limit for DVD - as if "-b 9800" was used without
realizing there will be peaks that need to be taken into account.
but
> INFO: [mplex] Average bit-rate : 4631200 bits/sec
> INFO: [mplex] Peak bit-rate : 22742800 bits/sec
Look at that bitrate spike! 22742800! I think the the input
video was encoded with a rate that was too high and there are
sections that exceed the VBV size of 220KB. The buffering can't
handle the rate spikes in the video stream, that gives the error.
What bitrate was specified when shrink.m2v was created? If 9800 was
used then that doesn't leave any room for peaks.
Try using a slightly lower setting. Maybe 8500, if that works then
move up a little.
Or if you want you can try using a higher bitrate and/or vbv size
with mplex (-r and -b respectively) but it may produce a stream
that won't play in all DVD players...
Cheers,
Steven Schultz
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