#9342 closed defect (invalid)
Audio clipping when joining segments with aselect filter
Reported by: | xamarin | Owned by: | |
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Priority: | normal | Component: | undetermined |
Version: | unspecified | Keywords: | |
Cc: | Blocked By: | ||
Blocking: | Reproduced by developer: | no | |
Analyzed by developer: | no |
Description
Summary of the bug:
How to reproduce:
Create a destination video by cutting 2 pieces of video from a big file and merging them together. In they place where they join, it produces a clipping noise on speakers, due to the sound waveform.
% ffmpeg -report -y -i in.mp4 -vf "select='between(t,72.75,74)+between(t,644.7,670)', setpts=N/FRAME_RATE/TB" -af "aselect='between(t,72.75,74)+between(t,644.7,670)', asetpts=N/SR/TB" -c:v libx265 -x265-params pass=1 -b:v 1700k -c:a aac -b:a 160k -f mp4 NUL && ffmpeg -y -i in.mp4 -vf "select='between(t,72.75,74)+between(t,644.7,670)', setpts=N/FRAME_RATE/TB" -af "aselect='between(t,72.75,74)+between(t,644.7,670)', asetpts=N/SR/TB" -c:v libx265 -x265-params pass=2 -b:v 1700k -c:a aac -b:a 160k -f mp4 out.mp4 $ ffmpeg --version ffmpeg version 2021-07-21-git-f614390ecc-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers built with gcc 10.3.0 (Rev5, Built by MSYS2 project) configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --en able-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpe g --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva 2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint libavutil 57. 1.100 / 57. 1.100 libavcodec 59. 3.102 / 59. 3.102 libavformat 59. 4.101 / 59. 4.101 libavdevice 59. 0.100 / 59. 0.100 libavfilter 8. 0.103 / 8. 0.103 libswscale 6. 0.100 / 6. 0.100 libswresample 4. 0.100 / 4. 0.100 libpostproc 56. 0.100 / 56. 0.100
Attachments (2)
Change History (4)
by , 3 years ago
Attachment: | waveform-clipping-on-Audacity.png added |
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comment:1 by , 3 years ago
Resolution: | → invalid |
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Status: | new → closed |
This bug report makes no sense.
Selecting random audio from random points and joining them and expect fluid transformation is unrealistic. If you really need it, you can sort of do it with acrossfade filter. But that is just a hack, if 2 segments diverge drastically and crossfading is short you will get distortions or clicks or both.
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Representation of the waveform on Audacity at merging point