#11321: dolby digital plus 7.1 defective decoding
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Reporter: Alexander | Type: defect
Status: new | Priority: normal
Component: avcodec | Version:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Greetings.
Summary of the bug:
I found out that the decoding of ddp 7.1 and ddp 7.1 joc is defective. It
looks like the audio data frames from one channel are dropping out into
the other channels. It happens in random places. This can be clearly seen
in the spectrogram, zooming in on a given defect location shows the
absence of signal in one channel and the presence of it in another. It
can be clearly audible as clicks on separate channels, but may not be
audible when listening on the player in stereo downmix. The defect appears
on all versions of ffmpeg with libavcodec decoder higher than 59.37.100.
How to reproduce:
{{{
ffmpeg-master-latest-win64-gpl\bin>ffmpeg.exe -drc_scale 0 -i
"sample.eac3" -c pcm_s24le "sample.wav"
ffmpeg version N-117868-gecc7d5db9c-20241123
libavcodec 61. 25.102 / 61. 25.102
}}}
How to reproduce:
{{{
ffmpeg-n7.1-latest-win64-gpl-7.1\bin>ffmpeg.exe -drc_scale 0 -i
"sample.eac3" -c pcm_s24le "sample_n7.1.wav"
ffmpeg version n7.1-36-g20c8a3f5ff-20241123
libavcodec 61. 19.100 / 61. 19.100
}}}
How to reproduce:
{{{
ffmpeg-n6.1-latest-win64-gpl-6.1\bin>ffmpeg.exe -drc_scale 0 -i
"sample.eac3" -c pcm_s24le "sample_n6.1.wav"
ffmpeg version n6.1.2-15-ga6a07eebdf-20241123
libavcodec 60. 31.102 / 60. 31.102
}}}
How to produce **correct results without defects:**
{{{
ffmpeg-n5.1-latest-win64-lgpl-5.1\bin>ffmpeg.exe -drc_scale 0 -i
"sample.eac3" -c pcm_s24le "sample_n5.1.wav"
ffmpeg version n5.1.6-11-gcde3c5fc0c-20241123
libavcodec 59. 37.100 / 59. 37.100
}}}
Screenshots of defects:
{{{
https://drive.google.com/file/d/1fYKmj9YUl3Zpz171mo57Taq81-rrI-
iP/view?usp=sharing
https://drive.google.com/file/d/157jC97KsJdpnwH0hh-SjFJtS-
T4BBVDD/view?usp=sharing
https://drive.google.com/file/d/1iVZAGU6iSpcE6bc3ZukQMJrcfSQiyNUg/view?usp=sharing
https://drive.google.com/file/d/1SBQR9wY1-OaXnJEs_wz6r5VktmhUvAJF/view?usp=sharing
}}}
eac3 7.1 sample:
{{{
https://drive.google.com/file/d/1H78XIQCBHg9YIj8gpcXWJ4uAVqGvI0sz/view?usp=sharing
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11321>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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