#5482: g721 (g726): fix audiable artefacts
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Reporter: ami_stuff | Owner: (none)
Type: defect | Status: open
Priority: normal | Component: avcodec
Version: git-master | Resolution:
Keywords: g726 | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by ami_stuff):
this also decodes into terrible quality:
{{{
./ffmpeg -i sin8k.wav -acodec g726 -y g726.wav
ffmpeg version N-112362-g4c422de1db Copyright (c) 2000-2023 the FFmpeg
developers
built with gcc 11 (Ubuntu 11.4.0-1ubuntu1~22.04)
configuration:
libavutil 58. 27.100 / 58. 27.100
libavcodec 60. 30.101 / 60. 30.101
libavformat 60. 15.100 / 60. 15.100
libavdevice 60. 2.101 / 60. 2.101
libavfilter 9. 11.100 / 9. 11.100
libswscale 7. 4.100 / 7. 4.100
libswresample 4. 11.100 / 4. 11.100
[aist#0:0/pcm_s16le @ 0x555b18bafb80] Guessed Channel Layout: mono
Input #0, wav, from 'sin8k.wav':
Metadata:
encoder : Lavf60.15.100
Duration: 00:00:30.00, bitrate: 128 kb/s
Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 8000 Hz, 1
channels, s16, 128 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (pcm_s16le (native) -> adpcm_g726 (g726))
Press [q] to stop, [?] for help
Output #0, wav, to 'g726.wav':
Metadata:
ISFT : Lavf60.15.100
Stream #0:0: Audio: adpcm_g726 (E[0][0][0] / 0x0045), 8000 Hz, mono,
s16, 32 kb/s
Metadata:
encoder : Lavc60.30.101 g726
[out#0/wav @ 0x555b18baf980] video:0kB audio:117kB subtitle:0kB other
streams:0kB global headers:0kB muxing overhead: 0.076667%
size= 117kB time=00:00:29.95 bitrate= 32.1kbits/s speed=1.75e+03x
}}}
{{{
./ffmpeg -i g726.wav -y out.wav
ffmpeg version N-112362-g4c422de1db Copyright (c) 2000-2023 the FFmpeg
developers
built with gcc 11 (Ubuntu 11.4.0-1ubuntu1~22.04)
configuration:
libavutil 58. 27.100 / 58. 27.100
libavcodec 60. 30.101 / 60. 30.101
libavformat 60. 15.100 / 60. 15.100
libavdevice 60. 2.101 / 60. 2.101
libavfilter 9. 11.100 / 9. 11.100
libswscale 7. 4.100 / 7. 4.100
libswresample 4. 11.100 / 4. 11.100
Input #0, wav, from 'g726.wav':
Metadata:
encoder : Lavf60.15.100
Duration: 00:00:30.00, bitrate: 32 kb/s
Stream #0:0: Audio: adpcm_g726 (E[0][0][0] / 0x0045), 8000 Hz, mono,
s16, 32 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (adpcm_g726 (g726) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, wav, to 'out.wav':
Metadata:
ISFT : Lavf60.15.100
Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 8000 Hz, mono,
s16, 128 kb/s
Metadata:
encoder : Lavc60.30.101 pcm_s16le
[out#0/wav @ 0x55a97e71dac0] video:0kB audio:469kB subtitle:0kB other
streams:0kB global headers:0kB muxing overhead: 0.016250%
size= 469kB time=00:00:29.69 bitrate= 129.3kbits/s speed= 986x
}}}
the problem does not happen with "-acodec g722"
--
Ticket URL: <https://trac.ffmpeg.org/ticket/5482#comment:2>
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