#5039: Incorrect TrueHD decoding
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Reporter: cehoyos | Owner:
Type: defect | Status: new
Priority: normal | Component: avcodec
Version: git-master | Keywords: thd
Blocked By: | Blocking:
Reproduced by developer: 0 | Analyzed by developer: 0
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http://thread.gmane.org/gmane.comp.video.ffmpeg.devel/203994
A user uploaded a TrueHD sample that is supposed to only contain 0xFFFFFF
but the two first channels of the output file always contain 0x01 or 0x02.
{{{
$ ffmpeg -i warnings_cut.thd -acodec pcm_s24le out.wav
ffmpeg version N-76844-g3885ef0 Copyright (c) 2000-2015 the FFmpeg
developers
built with gcc 4.7 (SUSE Linux)
configuration: --enable-gpl
libavutil 55. 9.100 / 55. 9.100
libavcodec 57. 16.100 / 57. 16.100
libavformat 57. 19.100 / 57. 19.100
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 15.100 / 6. 15.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, truehd, from 'warnings_cut.thd':
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Audio: truehd, 48000 Hz, 7.1, s32 (24 bit)
Output #0, wav, to 'out.wav':
Metadata:
ISFT : Lavf57.19.100
Stream #0:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, 7.1,
s32 (24 bit), 9216 kb/s
Metadata:
encoder : Lavc57.16.100 pcm_s24le
Stream mapping:
Stream #0:0 -> #0:0 (truehd (native) -> pcm_s24le (native))
Press [q] to stop, [?] for help
[truehd @ 0x2d32460] Lossless check failed - expected 00, calculated 05.
[truehd @ 0x2d32460] Lossless check failed - expected 00, calculated 08.
[truehd @ 0x2d32460] Lossless check failed - expected 00, calculated 0b.
[truehd @ 0x2d32460] Lossless check failed - expected 00, calculated 08.
[truehd @ 0x2d32460] Lossless check failed - expected 00, calculated 0f.
[truehd @ 0x2d32460] Lossless check failed - expected 00, calculated 08.
[truehd @ 0x2d32460] Lossless check failed - expected 00, calculated 0f.
...
...
[truehd @ 0x2d32460] Lossless check failed - expected 00, calculated 0c.
[truehd @ 0x2d32460] Lossless check failed - expected 00, calculated 09.
[truehd @ 0x2d32460] Lossless check failed - expected 00, calculated 0e.
[truehd @ 0x2d32460] Lossless check failed - expected 00, calculated 0f.
[truehd @ 0x2d32460] Lossless check failed - expected 00, calculated 04.
[truehd @ 0x2d32460] Lossless check failed - expected 00, calculated 03.
[truehd @ 0x2d32460] Lossless check failed - expected 00, calculated 0a.
[truehd @ 0x2d32460] Lossless check failed - expected 00, calculated 01.
[truehd @ 0x2d32460] Lossless check failed - expected 00, calculated 02.
[truehd @ 0x2d32460] Lossless check failed - expected 00, calculated 0a.
[truehd @ 0x2d32460] Lossless check failed - expected 00, calculated 09.
[truehd @ 0x2d32460] Lossless check failed - expected 00, calculated 05.
size= 56934kB time=00:00:50.60 bitrate=9216.0kbits/s
video:0kB audio:56933kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.000175%
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/5039>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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