#200 closed defect (fixed)
aac - failure decoding audio stream when audio configuration changes
| Reported by: | Glenn Callow | Owned by: | |
|---|---|---|---|
| Priority: | normal | Component: | avcodec |
| Version: | git-master | Keywords: | |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | yes | |
| Analyzed by developer: | no |
Description
After testing early Freeview HD support with MythTV, on some recordings on audio would stop partway through the recording. This typically happens on program start/end and the following error is reported:
[aac_latm @ 0xf13bc0]channel element 0.0 is not allocated
Using a recorded file, both VLC and Mplayer exhibit the same problem, which indicates FFMpeg as the likely source. What appears to happen is there is a change in audio configuration in some of the streams from stereo to six speakers and back again. FFMpeg can decode both configurations fine, but fails if a transition occurs mid-stream.
I've posted a 50MB clip that exhibits the problem at:
http://www.mediafire.com/?5zx2x3zv2g6hxys
The audio decodes fine for the first three quarters of the clip, and then fails when the program starts.
Attachments (3)
Change History (8)
comment:1 by , 14 years ago
| Component: | undetermined → avcodec |
|---|---|
| Reproduced by developer: | set |
| Status: | new → open |
| Summary: | aac_latm - failure decoding audio stream when audio configuration changes → aac - failure decoding audio stream when audio configuration changes |
| Version: | unspecified → git-master |
by , 14 years ago
| Attachment: | stereo51.aac added |
|---|
by , 14 years ago
| Attachment: | stereomono.aac added |
|---|
comment:2 by , 13 years ago
| Resolution: | → fixed |
|---|---|
| Status: | open → closed |
comment:3 by , 13 years ago
| Resolution: | fixed |
|---|---|
| Status: | closed → reopened |
The original sample still fails (parse_adts_frame_header is never called)
$ ffmpeg -i stereo51.loas out.ac3
ffmpeg version N-32813-g6d789f5, Copyright (c) 2000-2011 the FFmpeg developers
built on Sep 23 2011 09:28:25 with gcc 4.5.3
configuration: --cc=/usr/local/gcc-4.5.3/bin/gcc
libavutil 51. 17. 0 / 51. 17. 0
libavcodec 53. 17. 0 / 53. 17. 0
libavformat 53. 13. 0 / 53. 13. 0
libavdevice 53. 4. 0 / 53. 4. 0
libavfilter 2. 43. 3 / 2. 43. 3
libswscale 2. 1. 0 / 2. 1. 0
[loas @ 0x12b8780] max_analyze_duration 5000000 reached at 5013333
[loas @ 0x12b8780] Estimating duration from bitrate, this may be inaccurate
Input #0, loas, from 'stereo51.loas':
Duration: N/A, bitrate: N/A
Stream #0.0: Audio: aac_latm, 48000 Hz, stereo, s16
Incompatible sample format 's16' for codec 'ac3', auto-selecting format 'flt'
Output #0, ac3, to 'out.ac3':
Metadata:
encoder : Lavf53.13.0
Stream #0.0: Audio: ac3, 48000 Hz, stereo, flt, 128 kb/s
Stream mapping:
Stream #0.0 -> #0.0 (aac_latm -> ac3)
Press [q] to stop, [?] for help
[aac_latm @ 0x12beb20] channel element 0.0 is not allocated
Error while decoding stream #0.0
Error while decoding stream #0.0
...
Error while decoding stream #0.0
Error while decoding stream #0.0
Last message repeated 692 times
size= 308kB time=00:00:19.68 bitrate= 128.0kbits/s
video:0kB audio:308kB global headers:0kB muxing overhead 0.000000%
by , 13 years ago
| Attachment: | stereo51.loas added |
|---|
comment:5 by , 13 years ago
Sadly the fix for this issue caused some other files to decode corrupted.
See Issue574 for details.
I will attach two non-latm samples that show the problem:
$ ffmpeg -i stereomono.aac out1.wav ffmpeg version git-N-29973-gf2962ac, Copyright (c) 2000-2011 the FFmpeg developers built on May 17 2011 01:56:25 with gcc 4.5.3 configuration: --cc='/usr/local/gcc-4.5.3/bin/gcc -m32' --enable-gpl libavutil 51. 2. 1 / 51. 2. 1 libavcodec 53. 6. 0 / 53. 6. 0 libavformat 53. 1. 0 / 53. 1. 0 libavdevice 53. 0. 0 / 53. 0. 0 libavfilter 2. 5. 0 / 2. 5. 0 libswscale 0. 14. 0 / 0. 14. 0 libpostproc 51. 2. 0 / 51. 2. 0 [NULL @ 0x8ca3b20] Format aac detected only with low score of 25, misdetection possible! [aac @ 0x8ca5960] channel element 3.3 is not allocated [aac @ 0x8ca3b20] Estimating duration from bitrate, this may be inaccurate Input #0, aac, from 'stereomono.aac': Duration: 00:00:05.47, bitrate: 129 kb/s Stream #0.0: Audio: aac, 48000 Hz, stereo, s16, 129 kb/s Output #0, wav, to 'out1.wav': Metadata: encoder : Lavf53.1.0 Stream #0.0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s Stream mapping: Stream #0.0 -> #0.0 Press [q] to stop, [?] for help [aac @ 0x8ca5960] channel element 3.3 is not allocated Error while decoding stream #0.0 [aac @ 0x8ca5960] channel element 0.0 is not allocated Error while decoding stream #0.0 Error while decoding stream #0.0 ... Error while decoding stream #0.0 Error while decoding stream #0.0 Last message repeated 167 times size= 248kB time=1.32 bitrate=1536.3kbits/s ^M video:0kB audio:248kB global headers:0kB muxing overhead 0.017326%out1.wav contains one second of stereo sound, mplayer -ac ffaac -sb 31500 stereomono.aac plays the remaining >3 seconds of mono.
$ ffmpeg -i stereo51.aac out2.wav ffmpeg version git-N-29973-gf2962ac, Copyright (c) 2000-2011 the FFmpeg developers built on May 17 2011 01:56:25 with gcc 4.5.3 configuration: --cc='/usr/local/gcc-4.5.3/bin/gcc -m32' --enable-gpl libavutil 51. 2. 1 / 51. 2. 1 libavcodec 53. 6. 0 / 53. 6. 0 libavformat 53. 1. 0 / 53. 1. 0 libavdevice 53. 0. 0 / 53. 0. 0 libavfilter 2. 5. 0 / 2. 5. 0 libswscale 0. 14. 0 / 0. 14. 0 libpostproc 51. 2. 0 / 51. 2. 0 [aac @ 0x8ca5960] Sample rate index in program config element does not match the sample rate index configured by the container. [aac @ 0x8ca5960] channel element 3.1 is not allocated [aac @ 0x8ca3b20] max_analyze_duration reached [aac @ 0x8ca3b20] Estimating duration from bitrate, this may be inaccurate Input #0, aac, from 'stereo51.aac': Duration: 00:00:17.98, bitrate: 177 kb/s Stream #0.0: Audio: aac, 48000 Hz, stereo, s16, 177 kb/s Output #0, wav, to 'out2.wav': Metadata: encoder : Lavf53.1.0 Stream #0.0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s Stream mapping: Stream #0.0 -> #0.0 Press [q] to stop, [?] for help [aac @ 0x8ca5960] Sample rate index in program config element does not match the sample rate index configured by the container. [aac @ 0x8ca5960] channel element 3.1 is not allocated Error while decoding stream #0.0 [aac @ 0x8ca5960] Not evaluating a further program_config_element as this construct is dubious at best. [aac @ 0x8ca5960] channel element 0.0 is not allocated Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Last message repeated 22 times [aac @ 0x8ca5960] Not evaluating a further program_config_element as this construct is dubious at best. [aac @ 0x8ca5960] channel element 0.0 is not allocated Error while decoding stream #0.0 Error while decoding stream #0.0 ... Error while decoding stream #0.0 Error while decoding stream #0.0 Last message repeated 22 times [aac @ 0x8ca5960] Not evaluating a further program_config_element as this construct is dubious at best. [aac @ 0x8ca5960] channel element 0.0 is not allocated Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Error while decoding stream #0.0 Last message repeated 13 times size= 1368kB time=7.30 bitrate=1536.0kbits/s ^M video:0kB audio:1368kB global headers:0kB muxing overhead 0.003141%out2.wav contains 7 seconds of stereo sound, mplayer -ac ffaac -channels 6 -sb 180000 stereo51.aac plays four (more) seconds of 5.1 sound.