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• How to choose the thumbnail of the first video instead of the second video when you concatenate them with FFMPEG ?

  4 octobre 2018, par Lanh Dien Xa Tam

  I’ve been using FFMPEG to bulk add outro to my videos. This is the code I use :

  for %%f in (*.mp4) do (
  
    echo.>%%f.txt
  
    echo file '%%f' >> %%f.txt
  
    echo file 'outro/outro.mp4' >> %%f.txt
  
  )
  
  
  
  for %%f in (*.txt) do (
  
     ffmpeg -f concat -i %%f -c copy concatenated/%%f.mp4
  
  )

  The problem is the thumbnail of the output videos is always is the second video’s (the outro) but not the first. Does anybody here know how to pick the first video thumbnail to be the output’s thumbnail instead of the second’s ?

• Ffmpeg hls live stream video freezes for a second but audio continues and video catches up

  13 décembre 2022, par Bluchip Studio

  I am using the latest version of ffmpeg to create a hls live stream todo this i am using the following command

  


  /root/ffmpeg -y -loglevel debug -threads 0 -probesize 512000 -analyzeduration 512000 -user_agent "Chrome/98.0.4758.102" -i https://example.com/input.m3u8 -c:v copy -c:a copy -async 1 -tune zerolatency -fflags +genpts -hls_init_time 2.002 -hls_time 2.002 -hls_list_size 20 -hls_flags delete_segments+append_list -hls_segment_type mpegts -hls_segment_filename "/var/www/html/hls/segment_%05d.ts" -f hls "/var/www/html/hls/playlist.m3u8"


  


  I initially tried using fmp4 but i noticed the video would lag behind major and the audio would end up well ahead so i switched to mpegts

  


  i managed to fix the audio issue here using -async 1 on fmp4 this made no diffrence now i have a small issue where my stream will open and play but the video will freez every few seconds while the audio continues and then the video will jump to catch back up and continue then it will do it again and again and again

  


  dose anyone know what may be causing this issue i tried swapping to x264 in stead of copying the video stream and using force key frames to set a key frame every 2 seconds but this resulted in well the same issue if not a little worse

  


  i kind of expected the stream to play perfect with the settings i have and with the logs set to debug i cant see any errors at all

  


• I have created video using several images .. how to add fadein effect while every frame changing in video ? [duplicate]

  20 mai 2019, par Jeeva Murugan

  This question already has an answer here :

  • FFmpeg command for crossfading between 5 videos .How to manage setpts=PTS-STARTPTS ?
    
    1 answer
    

  I am running this code for creating video. How to add fadein effect for every frame in the video ?

  ffmpeg -r 2  -t 9 -pattern_type glob -i '*.png'  single_video.mp4