On Tue, 10 May 2005, Dik Takken wrote:
> One of my DV files reproducably triggers this error on last week's CVS
> checkout:
I don't think it's necessarily the DV data itself that is the
problem - but rather the exact length (number of frames).
> INFO: [mpeg2enc] Frame 49 49 P q=8.00 sum act=1886.01297
> INFO: [yuvscaler] End of stream!
> INFO: [yuvscaler] Normal exit: end of stream with frame number 50!
> INFO: [yuvcorrect] End of stream!
> INFO: [yuvcorrect] Normal exit: end of stream with frame number 50!
> INFO: [mpeg2enc] Signaling last frame = 49
> mpeg2enc: seqencoder.cc:433: void SeqEncoder::EncodeStream(): Assertion
> `pass1coded.size() == 0' failed.
>
> Bug?
Supposedly Andrew fixed that but I've seen it happen once in a while.
But only on a Linux system. On OS/X I don't see the problem. It's
a threading race condition with an OS dependency ;(
What you can do to work around it is use "-M 0" which disables the
threading logic completely in mpeg2enc. The default of 1 just
enables a 'readahead thread' but almost the identical effect can be
achieved (if it is deemed necessary) with a buffering program (such
as 'bfr' or even 'dd') in front of mpeg2enc. On a local system
(not pulling the data over a network) the default buffering in
mpeg2enc is sufficient so extra readahead or buffering gains only a
small improvement in performance.
Values of of 2 or higher for -M achieve very little speed up - there
are apparently enough serialization points in mpeg2enc that threading
doesn't speed things up much at all.
There haven't been any changes to the encoder in a while but recently
(yesterday and this morning ;)) the automake files and a few minor
compile warning error fixes were checked in. You might want to do
a cvs update;./autogen.sh;./configure;make install when it is
convenient.
Cheers,
Steven Schultz
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