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amaro

Member

Registered: 2022-02-08

Posts: 88  

ffmpeg split file using -segment_times

Hello everybody!

Trying to split one file into parts based on its silence gaps.

Using the '-segment_times' option of 'ffmpeg' with a file named '/media/split' containing the silence gaps times gives an error

ffmpeg -i "/media/input.mp3" -vn -map 0 -f segment -segment_times /media/split "output%03d.mp3"
[segment @ 0x624777763a40] Invalid time duration specification '/media/split' in times list /media/split
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:0 -- 
Conversion failed!

However, using the silence gaps times from that file directly works fine

ffmpeg -i "/media/input.mp3" -vn -map 0 -f segment -segment_times 00:23:19,00:33:15 "output%03d.mp3"
ffmpeg version 4.3.5-0+deb11u1 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 10 (Debian 10.2.1-6)
  configuration: --prefix=/usr --extra-version=0+deb11u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  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
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, mp3, from '/media/input.mp3':

The file looks like this

cat /media/split
00:23:19,00:33:15

Checked the 'ffmpeg' page here

https://ffmpeg.org/ffmpeg-formats.html#segment

and it says

segment_times times

Specify a list of split points. times contains a list of comma separated duration specifications, in increasing order.

How should that file look in order for the command to work?
Thank you!

Last edited by amaro (2023-06-09 23:43:04)

ralph.ronnquist

Administrator

From: Battery Point, Tasmania, AUS

Registered: 2016-11-30

Posts: 1,117  

Re: ffmpeg split file using -segment_times

NI web search result: https://ffmpeg.org/ffmpeg-formats.html# … gment_002c

enjoy.

amaro

Member

Registered: 2022-02-08

Posts: 88  

Re: ffmpeg split file using -segment_times

NI web search result: https://ffmpeg.org/ffmpeg-formats.html# … gment_002c

enjoy.

although I am sure the author(s) of that page believe(s) everything is explained clearly, regarding that issue it seems useless as long as there are only examples of putting the times directly in the command and there are no examples of how the file should look like

rbit

Member

Registered: 2018-06-12

Posts: 41  

Re: ffmpeg split file using -segment_times

segment_times times

    Specify a list of split points. times contains a list of comma separated duration specifications, in increasing order. See also the segment_time option.

It doesn't seem that -segment_times takes a filename argument.  You could try -segment_times $(cat /media/split) and see if that works

amaro

Member

Registered: 2022-02-08

Posts: 88  

Re: ffmpeg split file using -segment_times

segment_times times

    Specify a list of split points. times contains a list of comma separated duration specifications, in increasing order. See also the segment_time option.

It doesn't seem that -segment_times takes a filename argument.  You could try -segment_times $(cat /media/split) and see if that works

hmm, that didn't occur to me...

here is the output

ffmpeg -i "/media/input.mp3" -vn -map 0 -f segment -segment_times $(cat /media/split) "output%03d.mp3"
Automatic encoder selection failed for output stream #0:0. Default encoder for format segment (codec none) is probably disabled. Please choose an encoder manually.
Error selecting an encoder for stream 0:0

with the '-c copy' option

ffmpeg -i "/media/input.mp3" -vn -c copy -map 0 -f segment -segment_times $(cat /media/split) "output%03d.mp3"
[segment @ 0x586a4de6f240] Invalid time duration specification 'duration' in times list duration
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #1:0 (mjpeg (native) -> png (native))
  Stream #0:0 -> #1:1 (mp3 (mp3float) -> mp3 (libmp3lame))
    Last message repeated 1 times

adding the '-c copy' option produced one empty text file

ll
total 0
-rw-r--r-- 1 vb vb 0 Jun 11 01:15 output%03d.mp3

interestingly, renaming the '/media/split' file as '.csv' automagically turned it into

cat /media/split.csv
duration 00:23:19, 00:33:15

and the output was

ffmpeg -i "/media/input.mp3" -vn -c copy -map 0 -f segment -segment_times $(cat /media/split.csv) "output%03d.mp3"
[NULL @ 0x650df004aa40] Unable to find a suitable output format for '00:33:15'
00:33:15: Invalid argument

thank you, rbit!