[FFmpeg-trac] #867(avformat:open): -tag:[v|a] doesn't force a fourcc

Wed Jan 18 06:08:33 CET 2012

#867: -tag:[v|a] doesn't force a fourcc
------------------------------------+------------------------------------
             Reporter:  dericed     |                    Owner:
                 Type:  defect      |                   Status:  open
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:  atag mov    |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  0           |
------------------------------------+------------------------------------

Comment (by dericed):

 So this patch does force the output to use the 'in24' codec id; however
 the resulting file plays out as silence or a faint buzz sound.

 Here's the ffmpeg report

 {{{
 ffmpeg started on 2012-01-18 at 00:04:21
 Report written to "ffmpeg-20120118-000421.log"
 Command line:
 ./ffmpeg -y -report -i SoundieF.mpeg -ss 10 -t 5 -vn -acodec pcm_s24le
 -atag in24 SoudieF_ffmpeg_in24.mov
 ffmpeg version N-36769-gb18e17e Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Jan 12 2012 21:51:39 with llvm_gcc 4.2.1 (Based on Apple Inc.
 build 5658) (LLVM build 2335.15.00)
   configuration:
   libavutil      51. 34.100 / 51. 34.100
   libavcodec     53. 55.100 / 53. 55.100
   libavformat    53. 29.100 / 53. 29.100
   libavdevice    53.  4.100 / 53.  4.100
   libavfilter     2. 59.100 /  2. 59.100
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0.  6.100 /  0.  6.100
 [mpeg @ 0x7fd570828a00] Format mpeg probed with size=4096 and score=52
 [mpeg @ 0x7fd570828a00] probing stream 0 pp:2500
 [mpeg @ 0x7fd570828a00] Probe with size=794, packets=1 detected mpegvideo
 with score=25
 [mpeg @ 0x7fd570828a00] probing stream 0 pp:2499
 [mpeg @ 0x7fd570828a00] Probe with size=2809, packets=2 detected mpegvideo
 with score=25
 [mpeg @ 0x7fd570828a00] probing stream 0 pp:2498
 [mpeg @ 0x7fd570828a00] Probe with size=4824, packets=3 detected mpegvideo
 with score=25
 [mpeg @ 0x7fd570828a00] probing stream 0 pp:2497
 [mpeg @ 0x7fd570828a00] probing stream 0 pp:2496
 [mpeg @ 0x7fd570828a00] Probe with size=8854, packets=5 detected mpegvideo
 with score=25
 [mpeg @ 0x7fd570828a00] probing stream 0 pp:2495
 [mpeg @ 0x7fd570828a00] probing stream 0 pp:2494
 [mpeg @ 0x7fd570828a00] probing stream 0 pp:2493
 [mpeg @ 0x7fd570828a00] probing stream 0 pp:2492
 [mpeg @ 0x7fd570828a00] Probe with size=16914, packets=9 detected
 mpegvideo with score=25
 [mpeg @ 0x7fd570828a00] probing stream 0 pp:2491
 [mpeg @ 0x7fd570828a00] probing stream 0 pp:2490
 [mpeg @ 0x7fd570828a00] probing stream 0 pp:2489
 [mpeg @ 0x7fd570828a00] probing stream 0 pp:2488
 [mpeg @ 0x7fd570828a00] probing stream 0 pp:2487
 [mpeg @ 0x7fd570828a00] probing stream 0 pp:2486
 [mpeg @ 0x7fd570828a00] probing stream 0 pp:2485
 [mpeg @ 0x7fd570828a00] probing stream 0 pp:2484
 [mpeg @ 0x7fd570828a00] Probe with size=33034, packets=17 detected
 mpegvideo with score=51
 [mpeg @ 0x7fd570828a00] probed stream 0
 [mpeg2video @ 0x7fd570831000] err{or,}_recognition separate: 1; 1
 [mpeg2video @ 0x7fd570831000] err{or,}_recognition combined: 1; 10001
 [mpeg2video @ 0x7fd570831000] detected 2 logical cores
 [mpeg2video @ 0x7fd570831000] Unsupported bit depth: 0
 [mp2 @ 0x7fd570830a00] err{or,}_recognition separate: 1; 1
 [mp2 @ 0x7fd570830a00] err{or,}_recognition combined: 1; 10001
 [mpeg @ 0x7fd570828a00] max_analyze_duration 5000000 reached at 5005000
 Input #0, mpeg, from 'SoundieF.mpeg':
   Duration: 00:02:24.10, start: 839.378778, bitrate: 3786 kb/s
     Stream #0:0[0x1e0], 152, 1/90000: Video: mpeg2video (Main), yuv420p,
 352x480 [SAR 20:11 DAR 4:3], 3500 kb/s, 29.97 fps, 29.97 tbr, 90k tbn,
 59.94 tbc
     Stream #0:1[0x1c0], 193, 1/90000: Audio: mp2, 48000 Hz, stereo, s16,
 224 kb/s
 Incompatible sample format 's16' for codec 'pcm_s24le', auto-selecting
 format 's32'
 [pcm_s24le @ 0x7fd570831c00] err{or,}_recognition separate: 1; 1
 [pcm_s24le @ 0x7fd570831c00] err{or,}_recognition combined: 1; 10001
 [mp2 @ 0x7fd570830a00] err{or,}_recognition separate: 1; 10001
 [mp2 @ 0x7fd570830a00] err{or,}_recognition combined: 1; 10001
 Output #0, mov, to 'SoudieF_ffmpeg_in24.mov':
   Metadata:
     encoder         : Lavf53.29.100
     Stream #0:0, 0, 1/48000: Audio: pcm_s24le (in24 / 0x34326E69), 48000
 Hz, stereo, s32, 2304 kb/s
 Stream mapping:
   Stream #0:1 -> #0:0 (mp2 -> pcm_s24le)
 Press [q] to stop, [?] for help
 size=    1405kB time=00:00:04.99 bitrate=2305.2kbits/s
 video:0kB audio:1404kB global headers:0kB muxing overhead 0.051193%
 }}}

 I tested the same equivalent command in ffmbc which did produce a playable
 file. Here's the ffmbc output

 {{{
 ffmbc -y -i SoundieF.mpeg -ss 10 -t 5 -vn -acodec pcm_s24le -atag in24
 SoundieF_ffmbc_in24.mov
 FFmbc version 0.7-rc4
 Copyright (c) 2008-2011 Baptiste Coudurier and the FFmpeg developers
 Input #0, mpeg, from 'SoundieF.mpeg':
  Duration: 00:02:24.11, start: 839.368778, bitrate: 3786 kb/s
    Stream #0.0[0x1e0](und): Video: mpeg2video (Main), yuv420p, 352x480i
 tff [PAR 20:11 DAR 4:3], 3500 kb/s, 29.97 fps
    Stream #0.1[0x1c0](und): Audio: mp2, 48000 Hz, stereo, s16, 224 kb/s
 Incompatible sample format 's16' for codec 'pcm_s24le', auto-selecting
 format 's32'
 Output #0, mov, to 'SoundieF_ffmbc_in24.mov':
  Metadata:
    encoder: FFmbc 0.7
    Stream #0.0(und): Audio: pcm_s24le, 48000 Hz, stereo, s32, 2304 kb/s
 Stream mapping:
  Stream #0.1 -> #0.0
 Press [q] to stop, [?] for help
 adding 863 audio samples in stream #0.1
 [mov @ 0x7f9309000c00] replacing header in front, copying  1.38MB
 size=    1411kB time=00:00:05.00 bitrate=2306.5kbits/s
 video:0kB audio:1409kB global headers:0kB muxing overhead 0.107009%
 }}}

 I'll attach the output files to the ticket. Perhaps the ticket should be
 renamed to 'support in24 audio'.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/867#comment:4>
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