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• avutil/tests/channel_layout : make printing results part of the tests

  8 mars 2024, par Marton Balint

  avutil/tests/channel_layout : make printing results part of the tests
  Deduplicates a lot of code.
  Some minor differences (mostly white space and inconsistent use of quotes) are
  
  expected in the fate tests, there was no point aiming for exactly the same
  
  formatting.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavutil/tests/channel_layout.c
  • [DH] tests/ref/fate/channel_layout

• Split video stream with FFmpeg and play part with FFplay [closed]

  22 mars 2024, par Jan Hein

  I have a video stream send with FFmpeg to a other computer on my local network.
At the receiver computer I want to split the video stream in multiple parts and play them at the receiver computer. How can I do that ?

  


  Example :
Stream send form sender to receiver is 1000x1000 pixels.
At the receiver split the 1000x1000 pixel stream into four parts of 500x500 pixels, and play them all four on the receiver in a separate player.

  


  I have tryed it with a multicast stream to the receiver, and played it four times with FFplay, but that was not working correct.

  


  I also hve looked for multiple outputs with FFmpeg and then multiple pipes to FFplay, but could not find a solution.

  


• Can anyone tell me ffmpeg.wasm command to converting 24-bit color image to 8-bit color image without affecting transparency part ?

  4 avril 2024, par Rohit Nayak

  I am a new developer and currently developing a png compressor to compress png image file using next.js 14 app directory and I found the right command to do so

  


  ffmpeg -i input.png -c:v png -pix_fmt pal8 -vf "split[a][b];[a]alphaextract[am];[b]palettegen=stats_mode=diff[pl];[b][pl]alphamerge" output.png


  


  but i am unable to do so because I don't know how to convert that to ffmpeg.wash command.

  


  I am using node.js v20.11.0, @ffmpeg/ffmpeg version 0.12.6 and @ffmpeg/util 0.12.1", alone with @ffmpeg/core@ version 0.12.2 which seems to work well.

  


  My code is as following :

  


      ffmpeg.exec([
      "-i",
      `${file.name}`,
      "-c:v",
      "png",
      "-pix_fmt",
      "pal8",
      "-vf",
      "split[a][b];",
      "[a]alphaextract[am];",
      "[b]palettegen=stats_mode=diff[pl];",
      "[b][pl]paletteuse=new=1:alpha_threshold=128",
      `output.png`,
    ]);


  


  Is there anyone who can solve this problem ?
An early action will highly be appreciated😊

  


  Answer in the form of

  


  ffmpeg.exec([...commands ])