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• Convert from opus to ogg file using ffmpeg [python soundfile]

  27 septembre 2021, par Zabir Al Nazi

  I'm using python soundfile to audio files in one of my projects. I have a dataset that contains opus files.

  


  python soundfile can not read opus files directly but can read ogg files. (https://github.com/bastibe/python-soundfile/issues/252)

  


  How can I convert all the opus files to ogg files with ffmpeg ?

  


  I have tried the following command,

  


   ffmpeg -i test_file_2.opus -c:a libvorbis -b:a 16k test_file_2.ogg



  


  But I get an error,

  


  ffmpeg version 4.3 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7.3.0 (crosstool-NG 1.23.0.449-a04d0)
  configuration: --prefix=/opt/conda --cc=/opt/conda/conda-bld/ffmpeg_1597178665428/_build_env/bin/x86_64-conda_cos6-linux-gnu-cc --disable-doc --disable-openssl --enable-avresample --enable-gnutls --enable-hardcoded-tables --enable-libfreetype --enable-libopenh264 --enable-pic --enable-pthreads --enable-shared --disable-static --enable-version3 --enable-zlib --enable-libmp3lame
  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
[ogg @ 0x55bad6b9cbc0] 543 bytes of comment header remain
Input #0, ogg, from 'test_file_2.opus':
  Duration: 00:00:14.10, start: 0.000000, bitrate: 34 kb/s
    Stream #0:0: Audio: opus, 48000 Hz, mono, fltp
    Metadata:
      album           : Onder Moeders Vleugels
      ENCODER_OPTIONS : --quiet
      artist          : Louisa May Alcott
      title           : 02 - Een vroolijk kerstfeest
      encoder         : opusenc from opus-tools 0.1.10;Lavf57.83.100
Unknown encoder 'libvorbis'



  


• brew install ffmpeg installs python 3.9

  13 novembre 2020, par mrgloom

  For some reason brew install ffmpeg downloads python 3.9 as dependence

  


  ==> Installing dependencies for ffmpeg: gnutls, python@3.9, glib, cairo, gobject-introspection, harfbuzz, libass and libvpx


  


  As I can see here https://formulae.brew.sh/formula/ffmpeg there is no dependence on python 3.9

  


  How can I install ffmpeg for my current python Python 3.7.7 ?

  


  Update :

  


  Maybe something is broken in my python installation ?

  


  brew info python&#xA;&#xA;python@3.9: stable 3.9.0 (bottled)&#xA;Interpreted, interactive, object-oriented programming language&#xA;https://www.python.org/&#xA;/usr/local/Cellar/python/3.7.7 (4,165 files, 64.0MB) *&#xA;  Poured from bottle on 2020-04-03 at 20:11:58&#xA;From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/python@3.9.rb&#xA;License: Python-2.0&#xA;==> Dependencies&#xA;Build: pkg-config ✔&#xA;Required: gdbm ✔, openssl@1.1 ✔, readline ✔, sqlite ✔, xz ✔&#xA;==> Caveats&#xA;Python has been installed as&#xA;  /usr/local/bin/python3&#xA;&#xA;Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to&#xA;`python3`, `python3-config`, `pip3` etc., respectively, have been installed into&#xA;  /usr/local/opt/python@3.9/libexec/bin&#xA;&#xA;You can install Python packages with&#xA;  pip3 install <package>&#xA;They will install into the site-package directory&#xA;  /usr/local/lib/python3.9/site-packages&#xA;&#xA;See: https://docs.brew.sh/Homebrew-and-Python&#xA;==> Analytics&#xA;install: 588,344 (30 days), 666,372 (90 days), 666,373 (365 days)&#xA;install-on-request: 104,126 (30 days), 105,703 (90 days), 105,705 (365 days)&#xA;build-error: 0 (30 days)&#xA;</package>

  


  brew info shows python@3.9 but actually it's 3.7.7 :

  


  /usr/local/bin/python3 -V
Python 3.7.7


  


• Convert set of PNGs into rawvideo .raw FFMPEG

  13 août 2020, par Wire

  Recently, I have been trying to modify the boot animation of a little robot. It is a .raw file and it contains every RGB565 frame one after the other. I have been able to get all of the frames using

  


  ffmpeg -f rawvideo  -pixel_format rgb565 -video_size 184x96 -framerate 10 -i "boot_anim.raw" -r 1/1 boot_anim%02d.png

  


  But if I try to repack it with

  


  ffmpeg -i boot_anim%02d.png -f rawvideo -pix_fmt rgb565 -framerate 10 -video_size 184x96 -r 1/1 "boot_anim.raw"

  


  it only puts in the first two frames and nothing else. I have also tried libx264 and putting in vcodecs manually. Same result. I'm new to ffmpeg and Linux overall.

  


  Here is the full output :

  


  ffmpeg version N-98716-gb40dd2f Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --enable-encoder=png --enable-decoder=png
  libavutil      56. 58.100 / 56. 58.100
  libavcodec     58.100.100 / 58.100.100
  libavformat    58. 50.100 / 58. 50.100
  libavdevice    58. 11.101 / 58. 11.101
  libavfilter     7. 87.100 /  7. 87.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
Input #0, image2, from 'boot_anim%02d.png':
  Duration: 00:00:00.44, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: png, rgba(pc), 184x96, 25 fps, 25 tbr, 25 tbn, 25 tbc
File 'boot_anim.raw' already exists. Overwrite? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (png (native) -> rawvideo (native))
Press [q] to stop, [?] for help
[swscaler @ 0x556d6993d940] full chroma interpolation for destination format 'rgb565le' not yet implemented
Output #0, rawvideo, to 'boot_anim.raw':
  Metadata:
    encoder         : Lavf58.50.100
    Stream #0:0: Video: rawvideo (RGB[16] / 0x10424752), rgb565le, 184x96, q=2-31, 282 kb/s, 1 fps, 1 tbn, 1 tbc
    Metadata:
      encoder         : Lavc58.100.100 rawvideo
frame=    2 fps=0.0 q=-0.0 Lsize=      69kB time=00:00:02.00 bitrate= 282.6kbits/s dup=0 drop=9 speed= 871x    
video:69kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%


  


  Any help appreciated !