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• How to overlay video on video with FFMPEG

  28 septembre 2021, par Yogas

  ihave 2 input video.mp4 (with audio) and notif.mov (with audio). I want to overlay notif.mov on video.mp4. I tried this code :

  


  ffmpeg -y -i video.mp4 -i "notif.mov" -filter_complex "[0:v][1:v]overlay=0:0" output.mp4

  


  both videos playing simultaneously, but sound missing from second input (notif.mov)

  


  Any tips ? Thank you !

  


• Can you stream multiple video clips to youtube or twitch with a separate audio track with a different length than the video clips with FFMPEG ?

  8 juin 2020, par Fight Fire With Fire

  What I'd like to do is stream a set of video clips to youtube or twitch using FFMPEG. Right now i loop thru the videos file names in a list called DIRECTORY. video[0] is the file name and send to stream_url with the audio for the video attached.

  



  What i would love to figure out, is there a way I could mux in a single audio track streaming to youtube/twitch but switch the video clips out live. Here is the code I am working with right now :

  



  
     for video in directory:
            command = [
            "ffmpeg" , "-re" , "-i" , video[0] ,
            "-vcodec" , "libx264", "-pix_fmt", "yuv420p",
            "-preset" , "medium" , "-r" , "30" , "-g" , "48" , "-b:v" , "2500k" ,
            "-acodec" , "libmp3lame" , "-ar" , "44100", "-threads" , "6" ,
            "-q:a" , "3" , "-b:a" , "712000" ,"-bufsize", "512k" , "-f" ,
            "flv" , STREAM_URL,
        ]
             subprocess.run(command)



  


• How to handle queueing of video encoding during multiple video uploads ?

  6 mars 2016, par Yash Desai

  I am working on developing a video streaming site where users can upload videos to the site (multiple videos at once using the uploadify jquery plugin).

  Now, I am faced with the question of encoding the videos to FLV for streaming them online.

  When should the video encoding process take place ? Should it take place immediately after uploads have finished (i.e redirect the user to upload success page, and then start encoding in the background using exec command for ffmpeg ?) However, using this approach, how do i determine if the encoding has finished successfully ? What if users upload a corrupt video and ffmpeg fails to encode it ? How do i handle this in PHP ?

  How do i queue encoding of videos since multiple users can upload videos at the same ? Does FFMpeg has its own encoding queue ?

  I also read about gearman and message queueing options such as redis and AMQP in another related SO thread. Are these one of the potential solutions ?

  I would really appreciate if someone could give answers to my questions.