#5482(undetermined:new): g721 (g726): fix audiable artefacts
#5482: g721 (g726): fix audiable artefacts -------------------------------------+------------------------------------- Reporter: ami_stuff | Owner: Type: defect | Status: new Priority: normal | Component: Version: | undetermined unspecified | Keywords: Blocked By: | Blocking: Reproduced by developer: 0 | Analyzed by developer: 0 -------------------------------------+------------------------------------- decodes ok with sox https://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket1955/g721_1ch_44khz.au also reproducible with g726 sample: https://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket1955/g726_44khz_2bit.au {{{ C:\>ffmpeg -i C:\g721_1ch_44khz.au out.wav ffmpeg version N-79632-g3ce1988 Copyright (c) 2000-2016 the FFmpeg developers built with gcc 4.5.0 (GCC) 20100414 (Fedora MinGW 4.5.0-1.fc14) configuration: --prefix=/var/www/users/research/ffmpeg/snapshots/build --arch= x86 --target-os=mingw32 --cross-prefix=i686-pc-mingw32- --cc='ccache i686 -pc-min gw32-gcc' --enable-pthreads --enable-memalign-hack --enable-runtime- cpudetect -- enable-cross-compile --enable-static --disable-shared --extra- libs='-lws2_32 -lw inmm -lpthread' --extra-cflags='--static -I/var/www/users/research/ffmpeg/snapsh ots/build/include' --extra-ldflags='-static -L/var/www/users/research/ffmpeg/sna pshots/build/lib' --enable-bzlib --enable-zlib --enable-gpl --enable- version3 -- enable-nonfree --enable-libx264 --enable-libspeex --enable-libtheora --enable-li bvorbis --enable-libfaac --enable-libxvid --enable-libopencore-amrnb --enable-li bopencore-amrwb --enable-libmp3lame --enable-libfreetype --enable-libvpx --disab le-decoder=libvpx libavutil 55. 22.101 / 55. 22.101 libavcodec 57. 38.100 / 57. 38.100 libavformat 57. 34.103 / 57. 34.103 libavdevice 57. 0.101 / 57. 0.101 libavfilter 6. 44.100 / 6. 44.100 libswscale 4. 1.100 / 4. 1.100 libswresample 2. 0.101 / 2. 0.101 libpostproc 54. 0.100 / 54. 0.100 Input #0, au, from 'C:\g721_1ch_44khz.au': Duration: 00:00:30.01, start: 0.000000, bitrate: 176 kb/s Stream #0:0: Audio: adpcm_g726le ([23][0][0][0] / 0x0017), 44100 Hz, mono, s 16, 176 kb/s [wav @ 0x2c3eb60] Using AVStream.codec to pass codec parameters to muxers is dep recated, use AVStream.codecpar instead. Output #0, wav, to 'out.wav': Metadata: ISFT : Lavf57.34.103 Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono, s16, 705 kb/s Metadata: encoder : Lavc57.38.100 pcm_s16le Stream mapping: Stream #0:0 -> #0:0 (adpcm_g726le (g726le) -> pcm_s16le (native)) Press [q] to stop, [?] for help size= 2585kB time=00:00:30.01 bitrate= 705.6kbits/s speed= 213x video:0kB audio:2585kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.002946% }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/5482> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#5482: g721 (g726): fix audiable artefacts ------------------------------------+----------------------------------- Reporter: ami_stuff | Owner: 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 | ------------------------------------+----------------------------------- Changes (by cehoyos): * keywords: => g726 * status: new => open * version: unspecified => git-master * component: undetermined => avcodec Comment: I don't think this is _LE related or a regression: I can reproduce the artefacts with e344c1ea when forcing the little endian bitstream reader so I guess this is an issue in our G.726 implementation. -- Ticket URL: <https://trac.ffmpeg.org/ticket/5482#comment:1> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#5482: g721 (g726): fix audiable artefacts ------------------------------------+----------------------------------- 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 | ------------------------------------+----------------------------------- 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> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#5482: g721 (g726): fix audiable artefacts ------------------------------------+----------------------------------- 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 | ------------------------------------+----------------------------------- Changes (by ami_stuff): * Attachment "sin8k.wav" added. -- Ticket URL: <https://trac.ffmpeg.org/ticket/5482> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
#5482: g721 (g726): fix audiable artefacts ------------------------------------+----------------------------------- 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 | ------------------------------------+----------------------------------- Changes (by Lastique): * cc: Lastique (added) -- Ticket URL: <https://trac.ffmpeg.org/ticket/5482#comment:3> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker
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