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• Generate Black frames between concatenated videos ffmpeg

  9 février 2019, par Alex K

  I’m trying to concatenate 2 videos together using ffmpeg concat, but I want to have there be 2 seconds of black between the 2 videos.

  The problem is that whenever I’ve tried to generate a black video and concatenated it in, the properties never match my input video exactly, and so the concatenation is all broken - the audio is broken or the frames change at the wrong speed or generally concatenation fails.

  Here’s the output of ffmpeg -i my_input_video1.mp4 (and is identical for my_input_video2.mp4) :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input_vid1.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.3.100
  
    Duration: 00:00:03.07, start: 0.000000, bitrate: 191 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 480x270, 116 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 63 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler

  How can I generate a 2 second black video with these properties so that it can be concatenated with my input videos ?

• How do i convert videos uploaded by user to .swf ?

  3 avril 2020, par Anish Silwal

  I am creating a website which enables to upload videos. But we know that user can upload any kind of video but the browser can't play them. So, I thought that I somehow can convert them into .swf and play them using a flash player. I tried to use ffmpeg-php but it didn't worked. my code was :

  



  shell_exec('ffmpeg -i in.mp4 out.swf');


  



  It does not show any error neither it returns out.swf.

  



  Please ! help me.

  


• FFMPEG joining multiple videos in grid

  31 mars 2020, par Adam Gosztolai

  I am trying to join a series of videos in a grid. Here is a command I used for 3 videos.

  ffmpeg -y -i /mnt/labserver/vid1.mp4 -i /mnt/labserver/vid2.mp4 -i /mnt/labserver/vid3.mp4 -filter_complex "color=s=360x360:c=Black [nbase];[0:v]setpts=PTS-STARTPTS,scale=180x180[b0];[1:v]setpts=PTS-STARTPTS,scale=180x180[b1];[nbase][b0]overlay=shortest=1:x=0:y=180[temp0];[temp0][b1]overlay=repeatlast=1:x=0:y=360[temp1];[temp1][b2]overlay=repeatlast=1:x=0:y=540[temp2]" -c:v libx264 -pix_fmt yuv420p /mnt/labserver/videos_joined.mp4

  I get the following error

  Invalid stream specifier: b2

  As far as I recall this has previously worked for me. Could someone tell me what could be wrong here and whether perhaps the error depends on the FFmpeg version ?

  Thank you !!