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• FFmpeg for automatic video generation from images?

  22 January 2018, by Dionisis K

  I want to implement an automatic video generation from images, like facebook’s anniversary video. And I would also like to add some filters. I’ve been searching a lot and read FFmpeg’s documentation which is pretty amazing.

  In the future I want to have 10-20 "bashscripts" with different filters leading to different themes (e.g. fade-in, zoom, overlay images, left-to-right, etc..)

  So my biggest concern is having an interface which offers readable code and provides scalability. Since ffmpeg is a bashscript i searched for a wrapper

  There are wrappers in

  • https://github.com/PHP-FFMpeg/PHP-FFMpeg for php ,which doesn’t support image convertion to videos and complex filters .
  • https://github.com/fluent-ffmpeg/node-fluent-ffmpeg which looks promising but also difficult to go with complex filters
  • and https://github.com/kkroening/ffmpeg-python for python.I think that it s pretty good

  Are there any other wrappers worth to check ?
  Would you recommend something from the above ?
  Is there any pros and cons using a specific programming language for this particular case?
  Is there anything else i should bear in mind before I make a decision?

• FFMpeg: how to merge video and audio and tail align video to audio length?

  28 September 2021, by Bobby

  I have a video file and an audio file to merge together. Audio duration is shorter than video. I want to align them at tail and cut off the head part of the video.

  


  Graph illustration:

  


  [xxxx------] video
    [------] audio
    [======] merged


  


  Where "x" parts of the video is removed.

  


  The duration of the video/audio is unknown but the audio duration is guaranteed to be shorter than video. The reason of it being unknown is because I'm generating video dynamically and pipe to FFmpeg, so it is not possible to know the duration beforehand.

  


• Cutting HEVC video results in parts stating with no video (black image) but correct audio for a few seconds

  8 June 2020, by Oliver

  i have large HEVC video files and want to cut out parts of them. I use ffmpeg for that with the following command:

  



  ffmpeg -i input.mp4 -ss 01:18:47.040 -c:v copy -c:a copy -to 01:18:42.640 output.mp4


  



  i know that there can be problems when copy is used and no re-encoding, that is why i checked before that the frames specified in the -ss and -to parameters where keyframes (i-frames).

  



  So iam expecting to get a clean cut at the beginning and at the end. But what i get is 10 seconds of black image with normal audio in the beginning until the video starts. To make this clear: 10 seconds of video are missing in the beginning but the audio is fine.

  



  Btw: when moving the -ss part before the -i there seem to be no problems with the video (at least in the beginning). I know about the differences of putting -ss before and after the -i, but i also know, that using -ss after the -i should be slower (and was more accurate in the past) but should not make any differences in the final result. That is why I am so irritated.