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• FFmpeg-wasm colorbalance filter always create washed out image, how to fix this ?

  15 août 2022, par Pieter-Jan Delbecke

  I'm using FFmpeg wasm in the browser (React.js).
When I want to adjust the colors of a video using the colorbalance videofilter it always produces a washed out image.

  


  await ffmpeg.run("-i", "test.mov", "-vf", "colorbalance=-0.4:-0.2:0.2:-0.4:-0.2:0.2:0:0:0.0", "-pix_fmt", "yuv420p", "test.mp4");


  


  I'm usig the exact same command as in FFmpeg in my terminal (where it works correctly)

  


  ffmpeg -i test.mov -vf colorbalance=-0.4:-0.2:0.2:-0.4:-0.2:0.2:0:0:0.0 -pix_fmt yuv420p output02.mp4


  


  Has someone experienced the same issue ?
Washed-out image attached

  


• How to decode H264 stream to image byte array with ffmpeg in C# ?

  1er juin 2022, par massivemoisture

  I have an application in C# that receives H264 stream from a socket.

  


  The stream is in Annex B format. I want to decode the stream to individual image as a byte array.

  


  I saw this code snippet using PyAV, courtesy of leng-yue (https://github.com/leng-yue/py-scrcpy-client/blob/main/scrcpy/core.py) :

  


  raw_h264 = self.__video_socket.recv(0x10000)
                packets = codec.parse(raw_h264)
                for packet in packets:
                    frames = codec.decode(packet)
                    for frame in frames:
                        frame = frame.to_ndarray(format="bgr24")
                        if self.flip:
                            frame = cv2.flip(frame, 1)
                        self.last_frame = frame
                        self.resolution = (frame.shape[1], frame.shape[0])


  


  How can I do something similar with ffmpeg but in C# and the output is a byte array in BGR24 ? Thank you !

  


• ffmpeg complex filter pip loop not working

  4 août 2021, par Dzseti

  I am using an ffmpeg complex filter to :

  


  

  1. turn a number of images into a slideshow

  


  2. scale the slideshow to 1/6th of its original size

  


  3. loop the slideshow infinitely

  


  4. set the looping slideshow as a picture-in-picture over another looping video

  


  


  then add audio from another file which determines the maximum length of the final video.

  


  Everything is working except step 3.

  


  Here is my code (broken down into individual lines) :

  


  ffmpeg -y 
-loop 1 -t 5.5 -i /uploads/2021/07/slide04-scaled.jpg 
-loop 1 -t 5.5 -i /uploads/2021/07/Slide05-scaled.jpg 
-loop 1 -t 5.5 -i /uploads/2021/07/Slide06-scaled.jpg 
-i /slowwmo-videos/intro.mp4 
-i /uploads/2021/07/busy_bees_01.mp3 
-filter_complex 
"
[1]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+5/TB[a1];
[2]fade=d=0.5:t=in:alpha=1,setpts=PTS-STARTPTS+10/TB[a2];
[0][a1]overlay[b2];
[b2][a2]overlay[slides];
[slides]loop=loop=-1,scale=iw/6:ih/6,format=yuv420p,fps=fps=25[pip];
[3][pip]overlay=W-w-100:200[v]
" 
-map [v]:v:0 -map 4:a:0 -vcodec libx264 -profile:v main -video_track_timescale 25000 -pix_fmt yuv420p -s 1280x720 -acodec aac -af aresample=44100 -shortest /slowwmo-videos/busy_bees/7494.ts