Opened 3 years ago
Closed 3 years ago
#9437 closed defect (needs_more_info)
bursts of noise in alac output
Reported by: | Nat Goodspeed | Owned by: | |
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Priority: | normal | Component: | avcodec |
Version: | 4.3.2 | Keywords: | noise output |
Cc: | Blocked By: | ||
Blocking: | Reproduced by developer: | no | |
Analyzed by developer: | no |
Description
Summary of the bug:
Converting a particular 2-minute .ogg file to ALAC as .m4a produces a file containing brief bursts of white noise every couple seconds. This seems reminiscent of #2497, which was closed as fixed 8 years ago. Also that one only complained of a single burst of noise.
Moreover, although iTunes correctly reports the song duration as 2:02, at about 1:12 (after 16 such bursts) iTunes abruptly stops playing.
The whole point of attempting this conversion is to be able to play my nontrivial collection of .ogg files on iTunes, hence it must be a format understood by that player. I want to convert to ALAC rather than plain AAC since the original .ogg files are already lossy and I don't want to degrade the quality in conversion. This is the first song file I've tried, but results so far are hardly encouraging.
How to reproduce:
% ffmpeg -i songfile.ogg -acodec alac songfile.m4a ffmpeg is quite recently installed from MacPorts: ffmpeg version 4.4 Copyright (c) 2000-2021 the FFmpeg developers built with Apple LLVM version 10.0.0 (clang-1000.10.44.4) ... libavutil 56. 70.100 / 56. 70.100 libavcodec 58.134.100 / 58.134.100 libavformat 58. 76.100 / 58. 76.100 libavdevice 58. 13.100 / 58. 13.100 libavfilter 7.110.100 / 7.110.100 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 9.100 / 5. 9.100 libswresample 3. 9.100 / 3. 9.100 libpostproc 55. 9.100 / 55. 9.100
I selected Version 4.3.2 in the pulldown since I don't see version 4.4 there.
Attachments (1)
Change History (11)
comment:1 by , 3 years ago
follow-up: 4 comment:3 by , 3 years ago
oggdec/ogg123 decodes with same burst noises, so not our bug at least.
comment:4 by , 3 years ago
Replying to Elon Musk:
oggdec/ogg123 decodes with same burst noises, so not our bug at least.
Do we know what vorbis engine Clementine uses? That player plays that file without the noise bursts.
follow-up: 6 comment:5 by , 3 years ago
Actually i misread your report. I thought you talk about small burst at beginning and not about constant burst of noise. Anyway I can not reproduce your issue at all.
Looks like flawed ffmpeg build to me. Try another one.
comment:6 by , 3 years ago
Replying to Elon Musk:
Actually i misread your report. I thought you talk about small burst at beginning and not about constant burst of noise. Anyway I can not reproduce your issue at all.
Looks like flawed ffmpeg build to me. Try another one.
This one is from ffmpeg 4.3.1 on Ubuntu, installed via the Ubuntu Software app:
https://drive.google.com/file/d/1DPyUAfaGDV2mjI93tTZwnrnEBj5GQXHw/view?usp=sharing
ffmpeg version n4.3.1 Copyright (c) 2000-2020 the FFmpeg developers built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04) configuration: --prefix= --prefix=/usr --disable-debug --disable-doc --disable-static --enable-cuda --enable-cuda-sdk --enable-cuvid --enable-libdrm --enable-ffplay --enable-gnutls --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libmp3lame --enable-libnpp --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopus --enable-libpulse --enable-sdl2 --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxvid --enable-nonfree --enable-nvenc --enable-omx --enable-openal --enable-opencl --enable-runtime-cpudetect --enable-shared --enable-vaapi --enable-vdpau --enable-version3 --enable-xlib libavutil 56. 51.100 / 56. 51.100 libavcodec 58. 91.100 / 58. 91.100 libavformat 58. 45.100 / 58. 45.100 libavdevice 58. 10.100 / 58. 10.100 libavfilter 7. 85.100 / 7. 85.100 libswscale 5. 7.100 / 5. 7.100 libswresample 3. 7.100 / 3. 7.100 libpostproc 55. 7.100 / 55. 7.100
As you can hear, this suffers from bursts of static too. I haven't done a head-to-head to determine whether the static bursts appear in exactly the same places, but that seems likely.
comment:8 by , 3 years ago
Replying to Elon Musk:
Try with 4.4 instead.
It took me a while, but I did retry with ffmpeg 4.4, this one built from MacPorts on a newer Mac:
$ ffmpeg -i "Everybody's Weird.ogg" -acodec alac "Everybody's Weird.m4a" ffmpeg version 4.4 Copyright (c) 2000-2021 the FFmpeg developers built with Apple clang version 12.0.5 (clang-1205.0.22.11) configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-avresample --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-librsvg --enable-libtheora --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libsoxr --enable-libspeex --enable-libass --enable-libbluray --enable-lzma --enable-gnutls --enable-fontconfig --enable-libfreetype --enable-libfribidi --enable-zlib --disable-libjack --disable-libopencore-amrnb --disable-libopencore-amrwb --disable-libxcb --disable-libxcb-shm --disable-libxcb-xfixes --disable-indev=jack --enable-opencl --disable-outdev=xv --enable-audiotoolbox --enable-videotoolbox --enable-sdl2 --disable-securetransport --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --enable-libzimg --enable-libdav1d --arch=x86_64 --enable-x86asm --enable-libx265 --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid libavutil 56. 70.100 / 56. 70.100 libavcodec 58.134.100 / 58.134.100 libavformat 58. 76.100 / 58. 76.100 libavdevice 58. 13.100 / 58. 13.100 libavfilter 7.110.100 / 7.110.100 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 9.100 / 5. 9.100 libswresample 3. 9.100 / 3. 9.100 libpostproc 55. 9.100 / 55. 9.100 Input #0, ogg, from 'Famous_Last_Words_-_ODDS14_Everybody's_Weird.ogg': Duration: 00:02:02.07, start: 0.000000, bitrate: 122 kb/s Stream #0:0: Audio: vorbis, 44100 Hz, stereo, fltp, 128 kb/s Metadata: title : Everybody's Weird artist : Famous Last Words album : CDDB info not available track : 14 genre : folk comment : Produced using crip v3.7 (http://bach.dynet.com/crip) on Sun Jun 10 20:19:07 EDT 2007 sourcemedia : CD discid : 0d0c5d14 encoding : OggEnc v1.0.2 -q 4 REPLAYGAIN_TRACK_PEAK: 0.91232300 REPLAYGAIN_TRACK_GAIN: -3.94 dB Side data: replaygain: track gain - -3.940000, track peak - 0.000021, album gain - unknown, album peak - unknown, File 'Everybody's Weird.m4a' already exists. Overwrite? [y/N] y Stream mapping: Stream #0:0 -> #0:0 (vorbis (native) -> alac (native)) Press [q] to stop, [?] for help [alac @ 0x7fd41100be00] encoding as 24 bits-per-sample Output #0, ipod, to 'Everybody's Weird.m4a': Metadata: encoder : Lavf58.76.100 Stream #0:0: Audio: alac (alac / 0x63616C61), 44100 Hz, stereo, s32p (24 bit), 128 kb/s Metadata: title : Everybody's Weird artist : Famous Last Words album : CDDB info not available track : 14 genre : folk comment : Produced using crip v3.7 (http://bach.dynet.com/crip) on Sun Jun 10 20:19:07 EDT 2007 sourcemedia : CD discid : 0d0c5d14 encoding : OggEnc v1.0.2 -q 4 REPLAYGAIN_TRACK_PEAK: 0.91232300 REPLAYGAIN_TRACK_GAIN: -3.94 dB encoder : Lavc58.134.100 alac Side data: replaygain: track gain - -3.940000, track peak - 0.000021, album gain - unknown, album peak - unknown, size= 21573kB time=00:02:02.04 bitrate=1448.1kbits/s speed= 178x video:0kB audio:21566kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.032725%
The song is still interrupted by frequent bursts of static. I could post the output file, but to me it sounds just like the one I already linked above.
comment:9 by , 3 years ago
I'm really out of ideas. on master i enabled integer and undefined sanitizer and they reported nothing relevant, so i never get those bursts of noise.
comment:10 by , 3 years ago
Resolution: | → needs_more_info |
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Status: | new → closed |
Feel free to reopen if this still happens and upload ffmpeg -i buggy.alac x.wv wavpack file of decoding from your side.
To make this valid ticked you need to provide that input file.