On Thu, Oct 6, 2011 at 23:15, Philip Jägenstedt <[email protected]> wrote: > I'm attempting to use ffmpeg to encode archive-quality MPEG-2 for > http://www.archive.org/details/jagenstedtska-slaktforeningen-visingso-1991-filmvisning > and similar home videos. > > I've encoded using -target pal-dvd -b 8500k -aspect 4:3 -flags > +ilme+ildct and the output MPEG-2 can be found at the above URL. > > When playing this or any similarly encoded file with MPlayer, I get > these two messages: > > [ac3 @ 0x7f502a64b5e0]frame CRC mismatch > [ac3 @ 0x7f502a64b5e0]frame sync error > > The frame sync error is also repeated on every seek. I've tried git > versions of libav going back to v0.6, but it appears this is not a > recent regression. > > Is this cause for concern? Is it the encoder or decoder that is buggy? > Comparing the output of MPlayer's -dumpaudio of the original and > encoded audio tracks the lengths are slightly different, with the > encoded version being about 0.04 seconds delayed, but I'm not sure if > that's related in any way. > > I want to do this right once, so any help is appreciated. Perhaps AC3 > is not even the best option for the purpose?
Sorry for the spam, some Googling turned up https://lists.libav.org/pipermail/ffmpeg-user/2010-August/026430.html on the same issue. With mplayer -demuxer lavf the problem goes away and the -audiodump output is the same number of samples. -- Philip Jägenstedt _______________________________________________ libav-tools mailing list [email protected] https://lists.libav.org/mailman/listinfo/libav-tools
