[FFmpeg-trac] #2042(avformat:new): av_find_best_stream fails to find best stream for included file
FFmpeg
trac at avcodec.org
Wed Dec 19 00:51:12 CET 2012
#2042: av_find_best_stream fails to find best stream for included file
----------------------------------+---------------------------------------
Reporter: DonMoir | Type: defect
Status: new | Priority: normal
Component: avformat | Version: unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
----------------------------------+---------------------------------------
http://sms.pangolin.com/temp/av_find_best_stream_fails.ts
The above file has 9 streams and 4 programs.
All the video streams have AVCodecContext.bit_rate set to zero.
So if you use av_find_best_stream to find the video stream it returns 0
which is the worst stream. The 0 stream has a related audio stream which
has a sample_rate of 0.
For this file, if you first find the best audio stream and then find the
related video file it works as expected finding a descent audio and video
stream.
Typically I don't use av_find_best_stream but I noticed that it had
changed so ran some test on it.
Probably when a file has programs, av_find_best_stream needs to look thru
the programs and analyze the streams for both audio and video independent
of the type passed to av_find_best_stream to find the actual best stream.
Appears to be a cut file but represents a case that can probably happen.
ffplay av_find_best_stream_fails.ts
ffplay version N-47062-g26c531c Copyright (c) 2003-2012 the FFmpeg
developers
built on Nov 25 2012 12:23:20 with gcc 4.7.2 (GCC)
configuration: --disable-static --enable-shared --enable-gpl --enable-
version3
--disable-pthreads --enable-runtime-cpudetect --enable-avisynth
--enable-bzlib
--enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-
libopencore-amrwb
--enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-
libnut
--enable-libopenjpeg --enable-libopus --enable-librtmp --enable-
libschroedinger
--enable-libspeex --enable-libtheora --enable-libutvideo --enable-
libvo-aacenc
--enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
--enable-libx264
--enable-libxavs --enable-libxvid --enable-zlib
libavutil 52. 9.100 / 52. 9.100
libavcodec 54. 77.100 / 54. 77.100
libavformat 54. 37.100 / 54. 37.100
libavdevice 54. 3.100 / 54. 3.100
libavfilter 3. 23.102 / 3. 23.102
libswscale 2. 1.102 / 2. 1.102
libswresample 0. 17.101 / 0. 17.101
libpostproc 52. 2.100 / 52. 2.100
[mpeg2video @ 01184b20] mpeg_decode_postinit() failure
[mpeg2video @ 011b5240] mpeg_decode_postinit() failure
[mpeg2video @ 011f38c0] mpeg_decode_postinit() failure
[mpeg2video @ 01184b20] mpeg_decode_postinit() failure
Last message repeated 1 times
[mpeg2video @ 011f38c0] mpeg_decode_postinit() failure
[mpeg2video @ 01184b20] mpeg_decode_postinit() failure
[mpeg2video @ 011f38c0] mpeg_decode_postinit() failure
[mpeg2video @ 01184b20] mpeg_decode_postinit() failure
[mpeg2video @ 011b5240] mpeg_decode_postinit() failure
[mpeg2video @ 011f38c0] mpeg_decode_postinit() failure
[mpeg2video @ 01184b20] mpeg_decode_postinit() failure
Last message repeated 2 times
[mpeg2video @ 011f38c0] mpeg_decode_postinit() failure
[mpeg2video @ 01184b20] mpeg_decode_postinit() failure
[mpeg2video @ 011f38c0] mpeg_decode_postinit() failure
[mpeg2video @ 01184b20] mpeg_decode_postinit() failure
Last message repeated 1 times
[mpeg2video @ 011f38c0] mpeg_decode_postinit() failure
[mpeg2video @ 01184b20] mpeg_decode_postinit() failure
Last message repeated 2 times
[mpeg2video @ 011f38c0] mpeg_decode_postinit() failure
[mpeg2video @ 01184b20] mpeg_decode_postinit() failure
[mpeg2video @ 011f38c0] mpeg_decode_postinit() failure
[mpeg2video @ 01184b20] mpeg_decode_postinit() failure
[mpeg2video @ 011f38c0] mpeg_decode_postinit() failure
[mpeg2video @ 01184b20] mpeg_decode_postinit() failure
Last message repeated 2 times
[mpeg2video @ 011f38c0] mpeg_decode_postinit() failure
[mpeg2video @ 01184b20] mpeg_decode_postinit() failure
[mpeg2video @ 011f38c0] mpeg_decode_postinit() failure
[mpeg2video @ 01184b20] mpeg_decode_postinit() failure
Last message repeated 1 times
[mpeg2video @ 011f38c0] mpeg_decode_postinit() failure
[mpeg2video @ 01184b20] mpeg_decode_postinit() failure
Last message repeated 1 times
[mpeg2video @ 011f38c0] mpeg_decode_postinit() failure
[mpeg2video @ 01184b20] mpeg_decode_postinit() failure
[mpegts @ 011608e0] Stream #1: not enough frames to estimate rate;
consider incr
easing probesize
[mpegts @ 011608e0] Stream #8: not enough frames to estimate rate;
consider incr
easing probesize
[mpegts @ 011608e0] Could not find codec parameters for stream 1 (Audio:
ac3 (AC
-3 / 0x332D4341), 0 channels, s16): unspecified sample rate
Consider increasing the value for the 'analyzeduration' and 'probesize'
options
[mpegts @ 011608e0] Could not find codec parameters for stream 8 (Audio:
ac3 (AC
-3 / 0x332D4341), 0 channels): unspecified sample format
Consider increasing the value for the 'analyzeduration' and 'probesize'
options
[NULL @ 0118aae0] start time is not set in estimate_timings_from_pts
[NULL @ 0120f8a0] start time is not set in estimate_timings_from_pts
[mpegts @ 011608e0] PES packet size mismatch
Last message repeated 2 times
Input #0, mpegts, from
'd:\flashfiles\movies\av_find_best_stream_fails.ts':
Duration: 00:00:09.11, start: 63323.810800, bitrate: 18418 kb/s
Program 2
Stream #0:5[0x21]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
yuv420p
, 704x480 [SAR 10:11 DAR 4:3], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #0:6[0x24]( ): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
stereo, s1
6, 192 kb/s
Stream #0:7[0x25](eng): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
stereo, s1
6, 192 kb/s
Program 3
Stream #0:4[0x31]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
yuv420p
, 704x480 [SAR 10:11 DAR 4:3], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #0:8[0x34]( ): Audio: ac3 (AC-3 / 0x332D4341), 0 channels
Program 4
Stream #0:0[0x41]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
yuv420p
, 704x480 [SAR 10:11 DAR 4:3], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #0:1[0x164](eng): Audio: ac3 (AC-3 / 0x332D4341), 0 channels,
s16
Program 6
Stream #0:3[0x61]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
yuv420p
, 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #0:2[0x64](eng): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
5.1(side),
s16, 384 kb/s
Invalid sample rate or channel count!
Frame changed from size:0x0 to size:704x480 8KB sq= 0B f=0/0
75431.85 A-V: 0.000 fd= 0 aq= 0KB vq= 11KB sq= 0B f=0/0
Invalid sample rate or channel count is displayed since it chose a video
stream that had a related audio stream with sample_rate of zero.
VLC selected the wrong stream as well. WMP and Media Player Classic
selected better streams.
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2042>
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