#779 closed defect (fixed)
Channels swapping when decode TrueHD 6.1
Reported by: | TDiTP_ | Owned by: | |
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Priority: | important | Component: | avcodec |
Version: | git-master | Keywords: | thd |
Cc: | Blocked By: | ||
Blocking: | Reproduced by developer: | yes | |
Analyzed by developer: | no |
Description
Old problem with decoding of standart (and common) TrueHD 6.1-configuration:
Decoding of this layout by ffmpeg Win32 Build:
D:\>ffmpeg -i 0.thd -acodec pcm_s24le 0-ffmpeg.wav ffmpeg version N-35709-g7d531e8, Copyright (c) 2000-2011 the FFmpeg developers built on Dec 12 2011 13:50:00 with gcc 4.6.2 configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-runtime-cpud etect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libopencore-amrnb --enable -libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libop enjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --en able-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx 264 --enable-libxavs --enable-libxvid --enable-zlib libavutil 51. 32. 0 / 51. 32. 0 libavcodec 53. 43. 0 / 53. 43. 0 libavformat 53. 24. 0 / 53. 24. 0 libavdevice 53. 4. 0 / 53. 4. 0 libavfilter 2. 53. 0 / 2. 53. 0 libswscale 2. 1. 0 / 2. 1. 0 libpostproc 51. 2. 0 / 51. 2. 0 [truehd @ 020D94A0] Estimating duration from bitrate, this may be inaccurate Input #0, truehd, from '0.thd': Duration: N/A, start: 0.000000, bitrate: N/A Stream #0:0: Audio: truehd, 48000 Hz, 7 channels (FL+FR+FC+LFE+BC+SL+SR), s32 Output #0, wav, to '0-ffmpeg.wav': Metadata: encoder : Lavf53.24.0 Stream #0:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, 7 channels (FL+FR+FC+ LFE+BC+SL+SR), s32, 8064 kb/s Stream mapping: Stream #0:0 -> #0:0 (truehd -> pcm_s24le) Press [q] to stop, [?] for help [truehd @ 020D9D00] End of stream indicated. size= 3938kB time=00:00:04.00 bitrate=8064.1kbits/s video:0kB audio:3938kB global headers:0kB muxing overhead 0.001686%
Swapping channels is result:
input -> after_ffmpeg L -> L C -> C R -> R LFE -> LFE Cs -> SR Ls -> BC Rs -> SL
Here you can find all samples (input wavs and output TrueHD 6.1): http://www.mediafire.com/?lnkntqswa3qpd3c. PCMs were encoded by Dolby Media Producer Suite.
P.S. Exactly the same problem was in eac3to, but developer just decided to rename channels, as i can see.
Change History (3)
comment:1 by , 12 years ago
Keywords: | 6.1 decode decoder removed |
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Reproduced by developer: | set |
Resolution: | → fixed |
Status: | new → closed |
Version: | unspecified → git-master |
comment:2 by , 11 years ago
Keywords: | thd added; TrueHD removed |
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comment:3 by , 3 years ago
This is still good (checked wav in audition 2021, Center surround has sound in the end and compared to original many wav's), but of course the encoder does not support 6.1 and uses 5.1 while reencoding; is writing Center surround (that is only present in 6.1 not in 5.1) in both left and right surround.
Should be fixed, thank you for the sample!