![]() ![]() ![]() ![]() You can try with any video, also with this 2:įfmpeg -i "starwarssub2.vob" -c:v libx264 -preset medium -b:v 750k -profile:v baseline -level 3.0 -pix_fmt yuv420p -c:a aac -b:a 64k -ac 1 "starwarssub2 64k mono.mp4"įfmpeg version N-85091-g23ae3cc Copyright (c) 2000-2017 the FFmpeg developersĬonfiguration: -enable-gpl -enable-version3 -enable-cuda -enable-cuvid -enable-d3d11va -enable-dxva2 -enable-libmfx -enable-nvenc -enable-avisynth -enable-bzlib -enable-fontconfig -enable-frei0r -enable-gnutls -enable-iconv -enable-libass -enable-libbluray -enable-libbs2b -enable-libcaca -enable-libfreetype -enable-libgme -enable-libgsm -enable-libilbc -enable-libmodplug -enable-libmp3lame -enable-libopencore-amrnb -enable-libopencore-amrwb -enable-libopenh264 -enable-libopenjpeg -enable-libopus -enable-librtmp -enable-libsnappy -enable-libsoxr -enable-libspeex -enable-libtheora -enable-libtwolame -enable-libvidstab -enable-libvo-amrwbenc -enable-libvorbis -enable-libvpx -enable-libwavpack -enable-libwebp -enable-libx264 -enable-libx265 -enable-libxavs -enable-libxvid -enable-libzimg -enable-lzma -enable-zlibĭuration: 00:00:38.31, start: 2891.089167, bitrate: 7911 kb/s So, it makes me think maybe it's not really CBR?Īnd althought "-b:a" is supossed to make CBR, when compressing only audio, MediaInfo always reports Variable Bitrate, so no bitrate is visible with it.įfmpeg -i "1min stereo.wav" -c:a aac -b:a 64k -ac 1 "1min 64kb mono.aac" MediaInfo also reports a strange 64.5 kbps bitrate (when I wrote 64k), with 2 channels, 1 original channel and Front C position:ġ92k -> 159Kbps and Variable (with a max bitrate of 192Kbps) % ffmpeg -i input -c:v libx264 -b:v 750k -profile:v baseline -level 3.0 -pix_fmt yuv420p -c:a aac -b:a 64k -ac 1 outputįfmpeg version FFmpeg version: 20170330-ad7aff0 When converting stereo to mono, even it seems to really convert to mono, it's been reported as stereo and with a strange bitrate (not CBR?) by MediaInfo and VLC. ![]()
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