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

Wed Apr 20 21:19:17 EEST 2022

Rephrasing the requirement.

We have an audio pipeline which redacts the audios using the set of start
time and end time provided from our ML team. To achieve this, we execute
the ffmpeg command with filter
"volume=enable='between(t,starttime,endtime)':volume=0".
For some cases, we are receiving audio files with codecs which are causing
the outputs to have large file sizes. One such example is below,
ffprobe and ffmpeg output of the file is attached to the mail.
*command:* ffmpeg -i call.wav -af "volume=enable='between(t,0,1)':volume=0"
output.wav
*behaviour: *executed within a second, input file size 2.1 mb, output file
size 176 mb

As we can see here, the output file size is 88 times the original. The
objective here is to achieve the output file size of less than 2-3 times
the original without reducing the sound quality.
I went through the documentation but couldn't find any suitable way to fix
it. Let me know if anyone knows the issue in my command. Please point me to
some resource containing the details of audio codecs and filtering.

Regards,
Shubham

On Wed, Apr 20, 2022 at 11:33 PM Shubham Tiwari <shubham.tiwari at observe.ai>
wrote:

> Thanks Bouke for the opinion.
> Help from any other person is appreciated!!
>
> Regards,
> Shubham
>
> On Wed, Apr 20, 2022 at 11:27 PM Bouke / edit 'B <bouke at editb.nl> wrote:
>
>>
>>
>> > On 20 Apr 2022, at 19:50, Shubham Tiwari <shubham.tiwari at observe.ai>
>> wrote:
>> >
>> > 1 million audio files per day.
>>
>> Hire a specialist. Now. Immediately. Pay him / her well. Do NOT hesitate.
>> Do NOT think, just do it. Right now.
>> It WILL pay off.
>> Did I mention you DO NOT HAVE time to waste?
>>
>>
>> Bouke / edit 'B
>>
>> videotoolshed.com
>> Van Oldenbarneveltstraat 33
>> 6512 AS Nijmegen, the Netherlands
>> +31 6 21817248
>> If you want to send me large files, please use:
>> https://videotoolshed.wetransfer.com/ <
>> https://videotoolshed.wetransfer.com/>
>>
>>
>>
>>
>> _______________________________________________
>> ffmpeg-user mailing list
>> ffmpeg-user at ffmpeg.org
>> https://ffmpeg.org/mailman/listinfo/ffmpeg-user
>>
>> To unsubscribe, visit link above, or email
>> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".
>>
>
-------------- next part --------------
~/Downloads/ffprobe -i call.wav 
ffprobe version 4.4.1-tessus  https://evermeet.cx/ffmpeg/  Copyright (c) 2007-2021 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, ogg, from 'call.wav':
  Duration: 00:15:36.90, start: 0.000000, bitrate: 19 kb/s
  Stream #0:0: Audio: opus, 48000 Hz, stereo, fltp

------------------------------------------------------------------------------------------------------------------------------------------------------

With WAV output
 ~/Downloads/ffmpeg -i call.wav -af "volume=enable='between(t,0,1)':volume=0" 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, ogg, from 'call.wav':
  Duration: 00:15:36.90, start: 0.000000, bitrate: 19 kb/s
  Stream #0:0: Audio: opus, 48000 Hz, stereo, fltp
Stream mapping:
  Stream #0:0 -> #0:0 (opus (native) -> 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), 48000 Hz, stereo, s16, 1536 kb/s
    Metadata:
      encoder         : Lavc58.134.100 pcm_s16le
[opus @ 0x7f78d8009800] Error parsing the packet header.peed= 609x    
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
Error while decoding stream #0:0: Invalid data found when processing input
[opus @ 0x7f78d8009800] Error parsing the packet header.
[opus @ 0x7f78d8009800] Too many errors when draining, this is a bug. Stop draining and force EOF.
Error while decoding stream #0:0: Internal bug, should not have happened
size=  175668kB time=00:15:36.87 bitrate=1536.0kbits/s speed= 608x    
video:0kB audio:175667kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000043%

in-shtiwari at in-shtiwari temp % du -sh call.wav 
2.1M	call.wav
in-shtiwari at in-shtiwari temp % du -sh output.wav 
176M	output.wav