[FFmpeg-trac] #6216(avcodec:new): TrueHD encoder creates non bitexact files
FFmpeg
trac at avcodec.org
Fri Mar 3 21:33:43 EET 2017
#6216: TrueHD encoder creates non bitexact files
--------------------------------------+---------------------------------
Reporter: jamrial | Owner:
Type: defect | Status: new
Priority: normal | Component: avcodec
Version: git-master | Keywords: truehd
Blocked By: | Blocking:
Reproduced by developer: 0 | Analyzed by developer: 0
--------------------------------------+---------------------------------
Summary of the bug:
How to reproduce:
{{{
./ffmpeg -i truehd.wav -f md5 -
ffmpeg version N-83737-g68ee800a9d Copyright (c) 2000-2017 the FFmpeg
developers
built with gcc 6.3.0 (Rev2, Built by MSYS2 project)
configuration: --enable-gpl --enable-nonfree --enable-libx264 --enable-
libx265 --enable-libfdk_aac --enable-libvpx --enable-libmp3lame --enable-
libvorbis --enable-libopus --target-os=mingw32 --arch=x86_64 --cpu=haswell
--extra-cflags='-D_WIN32_WINNT=0x0602' --cc='ccache gcc'
--samples=../samples --prefix=/mingw64
libavutil 55. 47.101 / 55. 47.101
libavcodec 57. 82.100 / 57. 82.100
libavformat 57. 66.103 / 57. 66.103
libavdevice 57. 3.100 / 57. 3.100
libavfilter 6. 74.100 / 6. 74.100
libswscale 4. 3.101 / 4. 3.101
libswresample 2. 4.100 / 2. 4.100
libpostproc 54. 2.100 / 54. 2.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, wav, from 'truehd.wav':
Metadata:
encoder : Lavf57.66.103
Duration: 00:00:02.02, bitrate: 1411 kb/s
Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz,
stereo, s16, 1411 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (pcm_s16le (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, md5, to 'pipe:':
Metadata:
encoder : Lavf57.66.103
Stream #0:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
Metadata:
encoder : Lavc57.82.100 pcm_s16le
MD5=d886c9feaf7dddcdff3a5adcfa4c57bc
size= 0kB time=00:00:02.02 bitrate= 0.1kbits/s speed= 952x
video:0kB audio:348kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: unknown
}}}
{{{
% ./ffmpeg -i truehd.wav -c:a truehd -strict -2 truehd.thd
ffmpeg version N-83737-g68ee800a9d Copyright (c) 2000-2017 the FFmpeg
developers
built with gcc 6.3.0 (Rev2, Built by MSYS2 project)
configuration: --enable-gpl --enable-nonfree --enable-libx264 --enable-
libx265 --enable-libfdk_aac --enable-libvpx --enable-libmp3lame --enable-
libvorbis --enable-libopus --target-os=mingw32 --arch=x86_64 --cpu=haswell
--extra-cflags='-D_WIN32_WINNT=0x0602' --cc='ccache gcc'
--samples=../samples --prefix=/mingw64
libavutil 55. 47.101 / 55. 47.101
libavcodec 57. 82.100 / 57. 82.100
libavformat 57. 66.103 / 57. 66.103
libavdevice 57. 3.100 / 57. 3.100
libavfilter 6. 74.100 / 6. 74.100
libswscale 4. 3.101 / 4. 3.101
libswresample 2. 4.100 / 2. 4.100
libpostproc 54. 2.100 / 54. 2.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, wav, from 'truehd.wav':
Metadata:
encoder : Lavf57.66.103
Duration: 00:00:02.02, bitrate: 1411 kb/s
Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz,
stereo, s16, 1411 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (pcm_s16le (native) -> truehd (native))
Press [q] to stop, [?] for help
Output #0, truehd, to 'truehd.thd':
Metadata:
encoder : Lavf57.66.103
Stream #0:0: Audio: truehd, 44100 Hz, stereo, s16, 128 kb/s
Metadata:
encoder : Lavc57.82.100 truehd
size= 57kB time=00:00:02.02 bitrate= 231.8kbits/s speed= 103x
video:0kB audio:57kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.000000%
}}}
{{{
./ffmpeg -i truehd.thd -f md5 -
ffmpeg version N-83737-g68ee800a9d Copyright (c) 2000-2017 the FFmpeg
developers
built with gcc 6.3.0 (Rev2, Built by MSYS2 project)
configuration: --enable-gpl --enable-nonfree --enable-libx264 --enable-
libx265 --enable-libfdk_aac --enable-libvpx --enable-libmp3lame --enable-
libvorbis --enable-libopus --target-os=mingw32 --arch=x86_64 --cpu=haswell
--extra-cflags='-D_WIN32_WINNT=0x0602' --cc='ccache gcc'
--samples=../samples --prefix=/mingw64
libavutil 55. 47.101 / 55. 47.101
libavcodec 57. 82.100 / 57. 82.100
libavformat 57. 66.103 / 57. 66.103
libavdevice 57. 3.100 / 57. 3.100
libavfilter 6. 74.100 / 6. 74.100
libswscale 4. 3.101 / 4. 3.101
libswresample 2. 4.100 / 2. 4.100
libpostproc 54. 2.100 / 54. 2.100
Input #0, truehd, from 'truehd.thd':
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Audio: truehd, 44100 Hz, stereo, s32 (24 bit)
Stream mapping:
Stream #0:0 -> #0:0 (truehd (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, md5, to 'pipe:':
Metadata:
encoder : Lavf57.66.103
Stream #0:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
Metadata:
encoder : Lavc57.82.100 pcm_s16le
[truehd @ 0000000002544f40] Lossless check failed - expected 07,
calculated 04.
[truehd @ 0000000002544f40] Lossless check failed - expected 06,
calculated 04.
[truehd @ 0000000002544f40] Lossless check failed - expected 00,
calculated 02.
[truehd @ 0000000002544f40] Lossless check failed - expected 01,
calculated 03.
MD5=cba280ea373fa6287016c9bca7900bac
size= 0kB time=00:00:01.99 bitrate= 0.1kbits/s speed= 104x
video:0kB audio:346kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: unknown
}}}
The resulting stream is also for some reason reported as 24bit (s32)
instead of 16bit.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/6216>
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