[FFmpeg-user] Large Sized output files recieved while encoding the audio

[Bouke / edit 'B]

Hi Shubham,
When I copy your mail below (not done on this list, mind you!), it’s exactly as long as it was before. What do you expect?
Bouke



> On 20 Apr 2022, at 15:01, Shubham Tiwari <shubham.tiwari at observe.ai> wrote:
> 
> Hi,
> 
> When I run ffmpeg command on a wav file, the received output file is of
> large size as compared to the original file. The command and the output are
> below,
> 
> *FFMPEG command*
> 
> % ~/Downloads/audio/ffmpeg -i call-redacted.wav output.wav
> 
> ffmpeg version 4.4.1-tessus  https://evermeet.cx/ffmpeg/  Copyright (c)
> 2000-2021 the FFmpeg developers
> 
>  built with Apple clang version 11.0.0 (clang-1100.0.33.17)
> 
>  configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg
> --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl
> --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d
> --enable-libfreetype --enable-libgsm --enable-libmodplug
> --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb
> --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg
> --enable-libopus --enable-librubberband --enable-libshine
> --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora
> --enable-libtwolame --enable-libvidstab --enable-libvmaf
> --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp
> --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid
> --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3
> --pkg-config-flags=--static --disable-ffplay
> 
>  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
> 
>  libswscale      5.  9.100 /  5.  9.100
> 
>  libswresample   3.  9.100 /  3.  9.100
> 
>  libpostproc    55.  9.100 / 55.  9.100
> 
> Input #0, mp3, from 'call-redacted.wav':
> 
>  Metadata:
> 
>    encoder         : Lavf58.45.100
> 
>  Duration: 00:13:06.38, start: 0.138125, bitrate: 64 kb/s
> 
>  Stream #0:0: Audio: mp3, 8000 Hz, stereo, fltp, 64 kb/s
> 
> Stream mapping:
> 
>  Stream #0:0 -> #0:0 (mp3 (mp3float) -> pcm_s16le (native))
> 
> Press [q] to stop, [?] for help
> 
> Output #0, wav, to 'output.wav':
> 
>  Metadata:
> 
>    ISFT            : Lavf58.76.100
> 
>  Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 8000 Hz, stereo,
> s16, 256 kb/s
> 
>    Metadata:
> 
>      encoder         : Lavc58.134.100 pcm_s16le
> 
> size=   24569kB time=00:13:06.17 bitrate= 256.0kbits/s speed=2.97e+03x
> 
> video:0kB audio:24569kB subtitle:0kB other streams:0kB global headers:0kB
> muxing overhead: 0.000310
> 
> 
> *Input and output file sizes*
> 
> du -sh call-redacted.wav
> 
> 6.5M call-redacted.wav
> 
> du -sh output.wav
> 
> 24M output.wav
> 
> 
> Alternatively, when I run the same command but change the output
> file's extension to mp3, the correct sized file is returned. But the time
> taken (6 seconds) in this case is quite higher than the previous case(less
> than 1 second). The command and output is below,
> 
> 
> 
> ~/Downloads/audio/ffmpeg -i call-redacted.wav output.mp3
> 
> ffmpeg version 4.4.1-tessus  https://evermeet.cx/ffmpeg/  Copyright (c)
> 2000-2021 the FFmpeg developers
> 
>  built with Apple clang version 11.0.0 (clang-1100.0.33.17)
> 
>  configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg
> --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl
> --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d
> --enable-libfreetype --enable-libgsm --enable-libmodplug
> --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb
> --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg
> --enable-libopus --enable-librubberband --enable-libshine
> --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora
> --enable-libtwolame --enable-libvidstab --enable-libvmaf
> --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp
> --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid
> --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3
> --pkg-config-flags=--static --disable-ffplay
> 
>  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
> 
>  libswscale      5.  9.100 /  5.  9.100
> 
>  libswresample   3.  9.100 /  3.  9.100
> 
>  libpostproc    55.  9.100 / 55.  9.100
> 
> Input #0, mp3, from 'call-redacted.wav':
> 
>  Metadata:
> 
>    encoder         : Lavf58.45.100
> 
>  Duration: 00:13:06.38, start: 0.138125, bitrate: 64 kb/s
> 
>  Stream #0:0: Audio: mp3, 8000 Hz, stereo, fltp, 64 kb/s
> 
> Stream mapping:
> 
>  Stream #0:0 -> #0:0 (mp3 (mp3float) -> mp3 (libmp3lame))
> 
> Press [q] to stop, [?] for help
> 
> Output #0, mp3, to 'output.mp3':
> 
>  Metadata:
> 
>    TSSE            : Lavf58.76.100
> 
>  Stream #0:0: Audio: mp3, 8000 Hz, stereo, fltp
> 
>    Metadata:
> 
>      encoder         : Lavc58.134.100 libmp3lame
> 
> size=    2304kB time=00:13:06.17 bitrate=  24.0kbits/s speed= 130x
> 
> video:0kB audio:2304kB subtitle:0kB other streams:0kB global headers:0kB
> muxing overhead: 0.011063
> 
> du -sh output.mp3
> 
> 3.3M output.mp3
> 
> 
> Please help me out in identifying the right command options for optimum
> time and filesize.
> 
> 
> Regards,
> 
> Shubham
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