[FFmpeg-trac] #8437(avcodec:new): ffprobe: Wrong aspect ratio is reported
FFmpeg
trac at avcodec.org
Thu Dec 19 16:35:18 EET 2019
#8437: ffprobe: Wrong aspect ratio is reported
---------------------------------+--------------------------------------
Reporter: nafmo | Type: defect
Status: new | Priority: normal
Component: avcodec | Version: git-master
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
---------------------------------+--------------------------------------
Summary of the bug:
At $DAYJOB, we are using ffmpeg/ffprobe to detect the aspect ratio of a
program in a transport stream. After our customer upgraded the encoder
software, ffprobe now reports 16:9 aspect ratio instead of 4:3. The
streams are otherwise encoded in the same way.
For the sample files, I have kept only the PIDs relevant to the service
that reports the incorrect aspect ratio from the sample provided by the
customer. They have agreed to sharing the sample for the purpose of this
bug report. I am including a sample encoded with both the old and the new
version for reference. Please note that the actual image is 16:9, but it
should be signalled as 4:3.
I tried hooking into libavcodec/mpeg12dec.c:mpeg_decode_postinit() and
mpeg_deocde_sequence_display_extension() to see if I can understand why it
is detecting the clips differently, but so far I have not been able to
understand what is going on.
Correct: https://www.dropbox.com/s/fl6m9fh49va1oy7/SPTV-
AR-4-3-061-PGM05.ts?dl=1
Incorrect: https://www.dropbox.com/s/6h0illmu7ghomcl/SPTV-
AR-4-3-070-PGM05.ts?dl=1
How to reproduce:
Incorrect output "DAR 16:9":
{{{
$ ./ffprobe SPTV-AR-4-3-070-PGM05.ts
ffprobe version N-96094-gaad0e26f93 Copyright (c) 2007-2019 the FFmpeg
developers
built with gcc 8 (Debian 8.3.0-6)
configuration:
libavutil 56. 36.101 / 56. 36.101
libavcodec 58. 65.100 / 58. 65.100
libavformat 58. 35.101 / 58. 35.101
libavdevice 58. 9.101 / 58. 9.101
libavfilter 7. 69.101 / 7. 69.101
libswscale 5. 6.100 / 5. 6.100
libswresample 3. 6.100 / 3. 6.100
[mpeg2video @ 0x55b53eed8cc0] Invalid frame dimensions 0x0.
Last message repeated 22 times
[mpegts @ 0x55b53eeafd80] start time for stream 3 is not set in
estimate_timings_from_pts
[mpegts @ 0x55b53eeafd80] PES packet size mismatch
Last message repeated 1 times
Input #0, mpegts, from 'SPTV-AR-4-3-070-PGM05.ts':
Duration: 00:00:17.68, start: 225.307844, bitrate: 4513 kb/s
Program 1
Metadata:
service_name : T-CR01-PGM01HD
service_provider: Harmonic
Program 2
Metadata:
service_name : T-CR01-PGM02HD
service_provider: Harmonic
Program 3
Metadata:
service_name : T-CR01-PGM03HD
service_provider: Harmonic
Program 4
Metadata:
service_name : T-CR01-PGM04HD
service_provider: Harmonic
Program 5
Metadata:
service_name : T-CR01-PGM05SD
service_provider: Harmonic
Stream #0:0[0x1001]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
yuv420p(tv, bt709, top first), 720x480 [SAR 32:27 DAR 16:9], Closed
Captions, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #0:1[0x1041]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000
Hz, stereo, fltp, 138 kb/s
Stream #0:2[0x1051]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000
Hz, stereo, fltp, 155 kb/s
Stream #0:3[0x1201]: Subtitle: arib_caption (Profile A) ([6][0][0][0]
/ 0x0006)
Program 6
Metadata:
service_name : T-CR01-PGM06SD
service_provider: Harmonic
Program 7
Metadata:
service_name : T-CR01-PGM07SD
service_provider: Harmonic
Program 8
Metadata:
service_name : T-CR01-PGM08SD
service_provider: Harmonic
Unsupported codec with id 96272 for input stream 3
}}}
Correct output "DAR 4:3":
{{{
$ ./ffprobe SPTV-AR-4-3-061-PGM05.ts
ffprobe version N-96094-gaad0e26f93 Copyright (c) 2007-2019 the FFmpeg
developers
built with gcc 8 (Debian 8.3.0-6)
configuration:
libavutil 56. 36.101 / 56. 36.101
libavcodec 58. 65.100 / 58. 65.100
libavformat 58. 35.101 / 58. 35.101
libavdevice 58. 9.101 / 58. 9.101
libavfilter 7. 69.101 / 7. 69.101
libswscale 5. 6.100 / 5. 6.100
libswresample 3. 6.100 / 3. 6.100
[mpeg2video @ 0x5633746f1cc0] Invalid frame dimensions 0x0.
Last message repeated 28 times
[mpegts @ 0x5633746c8d80] start time for stream 3 is not set in
estimate_timings_from_pts
[mpegts @ 0x5633746c8d80] PES packet size mismatch
Last message repeated 1 times
Input #0, mpegts, from 'SPTV-AR-4-3-061-PGM05.ts':
Duration: 00:00:13.42, start: 46.268967, bitrate: 4539 kb/s
Program 1
Metadata:
service_name : T-CR01-PGM01HD
service_provider: Harmonic
Program 2
Metadata:
service_name : T-CR01-PGM02HD
service_provider: Harmonic
Program 3
Metadata:
service_name : T-CR01-PGM03HD
service_provider: Harmonic
Program 4
Metadata:
service_name : T-CR01-PGM04HD
service_provider: Harmonic
Program 5
Metadata:
service_name : T-CR01-PGM05SD
service_provider: Harmonic
Stream #0:0[0x1001]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
yuv420p(tv, bt709, top first), 720x480 [SAR 8:9 DAR 4:3], Closed Captions,
29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #0:1[0x1041]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000
Hz, stereo, fltp, 127 kb/s
Stream #0:2[0x1051]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000
Hz, stereo, fltp, 178 kb/s
Stream #0:3[0x1201]: Subtitle: arib_caption (Profile A) ([6][0][0][0]
/ 0x0006)
Program 6
Metadata:
service_name : T-CR01-PGM06SD
service_provider: Harmonic
Program 7
Metadata:
service_name : T-CR01-PGM07SD
service_provider: Harmonic
Program 8
Metadata:
service_name : T-CR01-PGM08SD
service_provider: Harmonic
Unsupported codec with id 96272 for input stream 3
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/8437>
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