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• FFMPEG- how to set presentation timestamp of a second video while merging a second video side-by-side with a first video

  14 octobre 2020, par Sankalpa Sarkar

  I was trying to merge a second video into a first video, side-by-side in a stacked fashion as a self-interest work. The twist is the video is a recording of a video call, where a second user might join at a later stage than the first user. The cumulative recording of the video call must reflect that the second user joins at a later stage than the first user. For this, I am using this code :

  


  DIFF=$(($start_ts-$BASEts))
DIFFms=`echo "scale=0;$DIFF/1000" | bc`
DIFFs=`echo "scale=4;$DIFF/1000000" | bc`
ffmpeg -i $a.webm -i b.webm -filter_complex \
    "[0]pad=2*iw:1*ih[l];[1]setpts=PTS-STARTPTS+$DIFFs/TB[1v]; [l][1v]overlay=x=W/2[v]; \
    [1]adelay=$DIFFms|$DIFFms[1a]; \
    [0][1a]amix=inputs=2[a]" \
    -map "[v]" -map "[a]" -vcodec libvpx -cpu-used -5 -deadline realtime finalOutput.webm


  


  However, the error being thrown here is :

  


  [Parsed_setpts_1 @ 0x55ada9df1dc0] [Eval @ 0x7ffff35acb60] Undefined constant or missing '(' in '/TB'
[Parsed_setpts_1 @ 0x55ada9df1dc0] Error while parsing expression 'PTS-STARTPTS+/TB'
[AVFilterGraph @ 0x55ada9d6c2a0] Error initializing filter 'setpts' with args 'PTS-STARTPTS+/TB'
Error initializing complex filters.
Invalid argument


  


  It is unable to read the $DIFFs variable at all, is what I figured. Can anybody help me out here ?

  


• Overlay a video and an image over a background video and shift that background video's position to the right

  4 août 2023, par sybr

  I'm currently working on a way to improve my production process for the videos that I'm making. I usually edit videos using two folders full of clips. Being able to automate putting these together in Premiere would save me a lot of time.

  


  I'm using the FFMpegCORE C# library, as well as Xabe.FFMpeg to achieve what I'm trying to do, and I've currently reached the point of creating two separate videos using the clips I mentioned earlier.

  


  The final step that I need to solve is to overlay the overlay video (overlay.mp4) over the background video (background.mp4), add an overlay image to add a clean divider (overlay.png) between the edges of the videos, and to somehow shift the position of the background video 33% to the right (background.mp4).

  


  This is the script I've come up with so far :

  


  ffmpeg -i overlay.mp4 -i background.mp4 -i overlay.png -filter_complex \ 
"[1:v]scale=608:1080[a]; [0:v]pad=1920:1080[b]; [b][a]overlay[out]; \
[out][2:v]overlay[out]; [0][1]amix[a];" \
-map [out] -map [a] -c:v libx264 -crf 30 -pix_fmt yuv420p -y output.mp4


  


  Is there a way to shift the background video to the right ? Or should I manually edit the video files ?

  


  Would love some help here, also eager to learn more about FFmpeg, so some explanation would be highly appreciated !

  


  Edit :

  


  Just found the solution, padding the background video for 33% and then cropping the final out back to 1920x1080 seemed to do the trick !

  


  ffmpeg -i overlay.mp4 -i background.mp4 -i overlay.png -filter_complex "[1:v]scale=608:1080[a]; [0:v]pad=2560:0:x=1920:y=1080[b]; [b][a]overlay[out]; [out][2:v]overlay[out]; [out]crop=1920:1080:0:0[out]; [0][1]amix[a];" -map [out] -map [a] -c:v libx264 -crf 30 -pix_fmt yuv420p -y output.mp4


  


• Play video overlay over video not working in ffmpeg

  24 décembre 2017, par Sumit Marwha

  I am trying to play video over another video using ffmpeg. When i am trying to play video from starting then overlay video plays. But if i try to overlay video from n seconds it doesn’t work

  ffmpeg -i input.mp4 -i overlay.mp4
  
  -filter_complex [1:v]scale=920:920[out],[out][0]overlay=0:0:enable='between(t\,4\,8)'[out]
  
  -map [out] output.mp4

  If i change between(t\,4\,8) to between(t\,0\,4) then overlay video works normally. It is not working for between(t\,4\,8). Please help how to solve it