[Ffmpeg-devel] [BUG] no video transcoding

[Michael Niedermayer]

Hi

On Sat, Apr 14, 2007 at 03:29:52PM +0200, Baptiste Coudurier wrote:
> Hi
> 
> ffmpeg -v 3 -i no_video_transcoding.m2t test.mov
> 
> 
> FFmpeg version SVN-r8731, Copyright (c) 2000-2007 Fabrice Bellard, et al.
>   configuration: --cc=gcc-4.2 --enable-libfaad --enable-libfaac
> --enable-gpl --enable-pthreads --enable-libmp3lame --enable-liba52
> --enable-x264 --enable-pp --disable-vhook
>   libavutil version: 49.4.0
>   libavcodec version: 51.40.3
>   libavformat version: 51.12.1
>   built on Apr 14 2007 15:14:53, gcc: 4.2.0 20070105 (prerelease)
> (Debian 4.2-20070105-1)
> Input #0, mpegts, from 'no_video_transcoding.m2t':
>   Duration: 00:00:05.8, start: 3494.827200, bitrate: 16775 kb/s
>   Stream #0.0[0x31], 1/90000: Video: mpeg2video, yuv420p, 1920x1080,
> 1001/30000, 18000 kb/s, 29.97 fps(r)
>   Stream #0.1[0x34](eng), 1/90000: Audio: ac3, 48000 Hz, 5:1, 384 kb/s
> File 'test.mov' already exists. Overwrite ? [y/N] y
> Output #0, mov, to 'test.mov':
>   Stream #0.0, 1/90000: Video: mpeg4, yuv420p, 1920x1080, 1001/30000,
> q=2-31, 200 kb/s, 29.97 fps(c)
>   Stream #0.1, 1/90000: Audio: aac, 48000 Hz, 5:1, 64 kb/s
> Stream mapping:
>   Stream #0.0 -> #0.0
>   Stream #0.1 -> #0.1
> No accelerated IMDCT transform found
> Press [q] to stop encoding
> timestamp discontinuity 3495197367, new offset= -6990024567
> timestamp discontinuity 9223372033359578441, new offset= 9223372033359948608
> timestamp discontinuity 3494859200, new offset= 9223372029865089408
> timestamp discontinuity -9223372036854404274, new offset= -6990057934
> timestamp discontinuity 9223372036854404274, new offset= 9223372029865089408

this is caused by the 8464->8465 change in libavformat/utils.c
---------
av_estimate_timings_from_pts() flushes the packet queue but doesn't
reset the streams' cur_dts values.  This can lead to a fatal "error,
non monotone timestamps ..." message later, because the out-of-date
cur_dts values are used to compute some packet's dts.

Fix this by calling av_read_frame_flush() and eliminate code
duplication in the process.

The additional hunk gives more detailed error messages.

patch by Wolfram Gloger, wmglo dent.med.uni-muenchen de
---------

ill leave this to wolfram to debug as it is his patch which seems to
cause it ...

[...]
> 
> ftp://ffmpeg:ffmpeg at ftp.smartjog.net/no_video_transcoding.m2t
[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

No great genius has ever existed without some touch of madness. -- Aristotle
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