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• Encode video frame by frame using FFmpeg

  15 décembre 2019, par Lauren

  I’m trying to encode a WebRTC video. WebRTC provides this method

  @Override
  
  public void onFrame(VideoFrame frame){
  
     //FFmpeg command
  
  }

  Each VideoFrame is YUV420 and provides information about rotation(integer), timestamp(long), width and height(https://github.com/webrtc-uwp/webrtc/blob/master/sdk/android/api/org/webrtc/VideoFrame.java).

  Is it possible to use the above event-method to encode the Video using FFmpeg ?

  Obviously, video frames would be provided dynamically maybe that’s an issue.

• ffmpeg : record/capture stream and do scene detection at the same time

  2 août 2022, par AnodeCathode

  Is it possible to both capture (record) an RTSP stream and capture scene change events using a single ffmpeg command ? I can almost do what I want with :

  



  ffmpeg -i 'rtsp://mystream' \
-map 0:v -map 0:a -c:v copy -c:a copy -f segment \
-segment_time 300 -segment_format matroska -strftime 1 "%Y%m%d%H%M%S_video.mkv" \
-map 0:v -an -filter:v "select='gt(scene,0.1)'" -frames:v 1 "%Y%m%d%H%M%S_scenechange.png"


  



  This gives me nice 300s stream segments saved to disk, and a scene.png when a scene change is detected. However, scene.png only appears when I terminate the process, and when I do, I only get the last scene event. Ideally I'd like to get a new PNG (or even better, a short video clip) anytime a scene change is detected, without interrupting the recording of video.mkv. I'm sure it can be done with pipes and multiple ffmpeg commands, but for simplicity's sake (and mostly my own curiosity at this point), I'd like to see what can be done with just a single process.

  


• Embed graphics/information to a streaming

  3 mars 2016, par Jorge Anzola

  How can I embed information or graphics to a stream.
  Like the "marquee" (IDK what’s its name) in a football/soccer game or any other live event. (Score, time and logo)

  

  I’ve to add a watermark with FFMPEG’s filter like

  ffmpeg -i sample.mp4 -i info.png -filter_complex overlay -c:v copy -c:a copy -f flv rtmp://wowzaServerAdress

  And I was thinking to change info.png with updated info. I had no idea if that could work, it was just a test. Anyhow, it gave this error :

  Streamcopy requested for output stream 0:0, which is fed from a complex filtergraph. Filtering and streamcopy cannot be used together.

  So, basically that error killed my only idea. Do you know how can achieve this with FFMPEG or similar ? I’d prefer not to use something like Xsplit.