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• FFmpeg covering H264 to H265 without loosing quality

  5 septembre 2022, par drekka

  I'm looking to convert some mkv files with H264 streams to mkv with H265 streams to save some space. Currently I'm doing this :

  


  ffmpeg -i test.mkv -map 0:v -map 0:m:language:eng -c:v libx265 -c:a copy -c:s copy test-2.mkv


  


  But I notice that the progress is displaying with a low q like this

  


  frame=  484 fps=3.2 q=32.6 size=    2560kB time=00:00:20.70 bitrate=1012.9kbits/s speed=0.136x


  


  Not an expert here, but it's my understanding that high quality is around q22-18 with a lower number being better.

  


  So if I want H265 without any lose of quality should I add a q argument to set it lower ? Or is that just going to do nothing because the original material isn't great and it's that q I'm seeing in the progress display ?

  


  Follow up : The encoding's now finished and much to my surprise the H265 file is not just smaller, but massively smaller. My original test file was 29G in size, the resulting H265 is 1.5G in size. Way smaller than I was expected.

  


• using ffmpeg to resize video with black bars

  23 juillet 2018, par Jens S

  i have a video with resolution 720:576 and i want it to have the ratio 16:9, e.g. 1024:576 with black bars on the sides. don’t know if it matters, but i am working with ffmpeg for windows. After research i tried the solution i found on 2 related questions :

  -i .\video.mp4 -vf scale=1024:576:force_original_aspect_ratio=decrease,pad=1024:576:(ow-iw)/2:(oh-ih)/2,setsar=1 out.mp4

  but i get an output that "ow-iw" was not recognized. Here is the complete output. unfortunatly it is in german(as am i) if u tell me how to change the output language i will provide it in english :

  ow-iw : Die Benennung "ow-iw" wurde nicht als Name eines Cmdlet, einer Funktion, einer Skriptdatei oder eines ausführbaren Programms erkannt. Überprüfen Sie die Schreibweise des
  
  Namens, oder ob der Pfad korrekt ist (sofern enthalten), und wiederholen Sie den Vorgang.
  
  In Zeile:1 Zeichen:119
  
  + ... :576:force_original_aspect_ratio=decrease,pad=1024:576:(ow-iw)/2:(oh- ...
  
  +                                                             ~~~~~
  
      + CategoryInfo          : ObjectNotFound: (ow-iw:String) [], CommandNotFoundException
  
      + FullyQualifiedErrorId : CommandNotFoundException

• Wanted : ffmpeg expert to help me with an encoding problem (paid job)

  22 août 2022, par Michael Heuberger

  Good day,

  


  I'm the developer of www.videomail.io and experience issues with audio. It's a heavily used, free service to enable Deaf people to email in Sign Language. Runs on ffmpeg (under node-fluent-ffmpeg) and JavaScript (Node.js).

  


  Since I am Deaf myself, I am unable to repair some audio-related issues while muxing video with audio together on server side via ffmpeg. Reason for adding audio is to expand the target audience.

  


  That said, I'm searching for someone to help me with this. It's a paid job !

  


  Requirements :

  


  

  • Must know ffmpeg very well, especially on how to encode audio (WAV) and video (MP4) together without any audio delays.

  


  • Knowing JavaScript would be a massive plus for writing code

  


  • Has time in the following weeks, I guess about 10 hours or so.

  


  


  If you are keen, ping me please. My page is www.binarykitchen.com - thanks !