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• FFMPEG Transcode H265 video from 10-bit to 8-bit

  6 juin 2020, par Zach

  I'm trying to convert my library from various formats into HEVC 8-bit mainly to shrink my library down. This is generally working but I've run into an issue when trying to convert an existing file from 10-bit H.265 to 8-bit H.265.

  



  My processor, an Intel Celeron J3455, supports hardware decoding/encoding H.265 at 8-bit but only hardware decoding for 10-bit.

  



  It seems that ffmpeg is attempting to keep the video as 10-bit to match the source rather than allowing me to convert to 8-bit and this is creating an error.

  



  Here is a sample command that I'm using :

  



  ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i input.10bit.x265.mkv -map 0:0 -c:v:0 hevc_vaapi -vf "scale_vaapi=w=-1:h=1080" -b:v 4027047 -map 0:1 -c:a:0 aac -b:a 384000 -ac 6 -map 0:s -scodec copy -map_metadata:g -1 -metadata JBDONEVERSION=1 -metadata JBDONEDATE=2020-06-06T20:52:36.072Z -map_chapters 0 output.8bit.x265.mkv

  



  The error I get is :

  



  [hevc_vaapi @ 0x5568b27fb1c0] No usable encoding entrypoint found for profile VAProfileHEVCMain10 (18).

Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height


  



  From what I can tell ffmpeg looks at the source and selectes VAProfileHEVCMain10 instead of VAProfileHEVCMain. I'd like to force it to output 8-bit.

  



  I've tried adding -pix_fmt yuv420p but that gives me this error :

  



  Incompatible pixel format 'yuv420p' for codec 'hevc_vaapi', auto-selecting format 'vaapi_vld' 


  



  I've also tried making this change to the command : "scale_vaapi=w=-1:h=1080,format=yuv420p"

  



  However that gives me the error :

  



  Impossible to convert between the formats supported by the filter 'Parsed_scale_vaapi_0' and the filter 'auto_scaler_0'

Error reinitializing filters!


  



  Any suggestions ?

  


• 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