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• How do i add multiple sound effects (mp3) to a video (mp4) at any given time in the video ? [closed]

  25 octobre 2023, par StudentProgrammer

  I am trying to automate my editing process. I have a video.mp4 with a given length, a folder with different sound-effects.mp3 and a list of timestamps = (t1, t2, t3...). I would like to be able to insert any sound-effect at any given time in the video. Furthermore a sound may last multiple seconds and overlap another sound. I've tried to visualize the concept with images.
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Preferably this would be done in Python. However, I would be extremely happy if anyone took their time to help me out using any means of programming required.

  


  I have tried using Moviepy without much success as I am only able to add sound to the start of the video. Perhaps ffmpeg is the way to go.

  


• 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 ?

  


• After Effects as backend movie engine ?

  8 août 2014, par jarasss

  I’m working right now on a project that could allow me to generate movies based on the user input. User will upload some samples (photos, movies) to the web app and web server should generate movie based on that input and some predefined movie compositions.

  I know that there are plenty of libraries for ffmpeg that could let me connect movies, photos programmatically (for example https://github.com/schaermu/node-fluent-ffmpeg for node.js) , but I was wondering if it’s possible to use Aftereffects for that purpose since I have some knowledge in that software. I imagine that there should be set of scripts in Aftereffects that could import user uploaded data, fire the movie renderer and save output to the given location.

  Do you think this is achievable using Aftereffects ? Or maybe someone had similar problem and solved that differently ?

  Cheers !