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• FFMPEG Interframe to intraframe without 'converting' or losing data

  11 août 2017, par Domenick Simpson

  I’m new to this so I apologise I couldn’t find the answer after searching.

  I am just ripping some video content for my film show-reel (specifically the Lego movie bluray) and came across some issues. When using ’makeMKV’ and ’xMedia Recode’ to perform a lossless transfer of the video data into an mp4 container I am getting artifacts in After Effects due to the interframe encoding of this bluray in H264 format. This doesn’t seem to be a problem with the Lego Batman movie bluray for some reason, maybe it uses Interframe. Anyway, some frames have block artifacts etc when editing / cutting shots.

  Is there a way to convert this original MP4 stream into the same format without losing data / into an intraframe mp4 for editing purposes ?

  I have used various re-encoding methods to H264 and prores that don’t result in block artifacts but result in less quality and different colourspace, and, higher file sizes.

  In FFMPEG I also tried exporting the mp4 as a png sequence but I assume due to the conversion of YUV to RGB I am getting quite noticeable differences in reds and gamma. I’d also prefer to keep this as a H264 or single video file if possible. Full disclosure, I tried various conversion types rgb24 etc to retain colour info but this didn’t work either.

• Matching loudness of commentary track with FFmpeg

  9 mai 2017, par Jon Sangster

  I am using FFmpeg to mix a MP3 file containing a commentary track into the soundtrack of multimedia file. So far I have had great success using FFmpeg’s sidechaincompress filter to auto-duck the soundtrack stream before mixing in the commentary. You can hear the commentary clearly, even when there’s loud music or explosions going on in the film.

  Awesome.

  However, the issue I have now is during the very quiet scenes. When the soundtrack is very quiet, the commentary seems far too loud. If I adjust the volume of the entire commentary track so that it sounds right during the quiet scenes, it’s too heard to hear during the loud scenes.

  My current idea is to somehow use the sidechaincompress filter to duck the commentary track as well, before finally mixing it into the soundtrack. The problem though is that sidechaincompress compresses the target’s volume when the source is loud, but I need the volume to be compressed when the source is quiet.

  I have to admit that I am a quiet the newbie in this domain, so I may coming at this entirely wrong. I’m happy for any advice you can provide !

• Why does x264 keep giving me "command not found" error on my Mac ? [closed]

  2 juillet 2021, par hd-dvd

  I just installed x264 via Homebrew on my Mac running MacOS 11.4 Big Sur. I'm trying to encode a video but I can't get x264 to run properly.

  


  This is the command I am running in the Terminal :

  


  x264 --bitrate 25000 --preset veryslow --bluray-compat --tune film --vbv-maxrate 40000 --vbv-bufsize 30000 --level 4.1 --keyint 30 --open-gop --slices 4 --fake-interlaced --colorprim "bt709" --transfer "bt709" --colormatrix "bt709" --sar 1:1 --pass 1 -o out.264 in.mp4

  


  and this is what it outputs :

  


  bash: x264 --bitrate 25000 --preset veryslow: command not found

  


  If I delete the --preset part then it just gets hung up on some other part, like --tune.

  


  I have tried brew doctor and there are no errors.

  


  If I just run x264 then it gives me x264 [error]: No input file. Run x264 --help for a list of options. so it seems as if x264 is installed. I don't know where to begin troubleshooting this but I'd like to get it to work.

  


  If I simplify the command way down to x264 -o out.264 in.mp4 then I get :

  


  avs [error]: failed to load avisynth
raw [error]: raw input requires a resolution.
x264 [error]: could not open input file `in.mp4' via any method!


  


  I would greatly appreciate some pointers on how to get this working.