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• How can I synchronize audio and video in real-time transcoding using ffmpeg API ?

  25 mai 2023, par qwer

  I was using ffmpeg api for realtime tanscoding, but somethimes when the system resources (memory) become limited , audio and video is out of syn, as i was tanscoding and pushing rtmp stream so it involves both decoding and and encoding , do i need some sync method to solve the problem, on whatside should i do the synchronizton, during the demux decode time or the encode push stream time,thanks in advance.

  


  i was experencing the problem,and i don't konw how to solve the problem , i was trying to sync the pts in the demux period , read the avpacket and sync the time based on current system time,but no luck.

  


• ffmpeg command to insert the Static frames in a video, if the video has the gaps inside of it ?

  1er septembre 2020, par geo-freak

  I have a 10 min video file(.ts file), it has the gaps(empty video) from 4th min to 7th min. I want to insert the static frames from start of the gaps to end of the gap.

  


  I have a command to create the static video with null(silent) audio.

  


  ffmpeg -loop 1 -i img002.jpg -f lavfi -i anullsrc=channel_layout=5.1:sample_rate=48000 -c:v libx264 -t 10 -pix_fmt yuv420p -vf scale=480:320 -y output.ts


  


  I want to add this static video with silent audio in a a recording from specific period.

  


  How can I achieve it ?

  


  Thanks in advance.

  


• FFMPEG delay mutliple overlay videos (with different delays)

  28 avril 2019, par Bamba675

  I’m trying to overlay a video (for example a report) with different other videos or images, like hints to the facebook page or a hint to the website. These other videos or images are smaller than the original and sometimes transparent (rgba).

  I already tried to overlay multiple videos, which works pretty well :
  

  ffmpeg -i 30fps_fhd.mp4 -i sample.mp4 -i timer.webm -i logo.jpg -filter_complex "overlay = x=100:y=1000, overlay = x=30:y=66:eof_action=pass, overlay = x=0:y=0" -acodec copy -t 70 out.mp4

  But now, I want to start some videos or images not at the beginning of the video, instead after a period of time.
  I found flags like ’itsoffset’ or ’setpts’, but I dont know how to apply them on this ’multiple video / image overlay command’.

  LG Bamba