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• How to make a thread with libavcodec library ?

  12 janvier 2014, par Blue Sky

  How can I make a thread using libavcodec (ffmpeg library) ? I want to call avformat_open_input within a separate thread to check for an available video stream at a specific UDP address. The reason for this is that avformat_open_input checks the UDP address continuously in a loop until a video data comes available, and during this period the program looks like halted. Any idea ? Thanks !

• Is there a way to combine identical frames when outputting animated gif ?

  4 juillet 2023, par XylemFlow

  Some of the animations I export to animated gif with FFmpeg have long pauses where the frames are identical. Is there a way for FFmpeg to detect this and encode them as a single frame with a longer pause period ? In other words, combine identical frames. I currently use

  


  -vf palettegen=stats_mode=full
-f gif -lavfi paletteuse=diff_mode=rectangle:dither=none -loop -1


  


  The file sizes are quite large as a result. Optimizing them with ezgif makes them a lot smaller by combining the frames.

  


• How to convert images to a video by the time they have been taken/saved and not by name ?

  26 avril 2019, par Xester Menia

  I have a Livestream that takes pictures every one or two seconds. Then I have a folder in which the pictures are being saved.
  Usually I would just simply take ffmpeg -start_number -i IMG_%d.JPG video.webm (I need the end format in .webm). I want to use the saved pictures to form a time-lapse to put up next to the stream. So people can see the last 24h/ 7d and 90d. So I wondered if I could code that all the pics of that time period are used and only them.
  I later want it to happen automatic, so i dont have to write the code new every day.

  Thanks for your help