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• Ffmpeg , overlay two sequences of png's and turn them into a movie

  12 mai 2014, par Lau Llobet

  i’ve found how to turn a png sequence into a movie, also i’ve found how to overlay two movies using transparency but I don’t know how to do both things at once (using png’s tranparency).

  The bottom layer of png’s is smaller than the top one and needs to be stretched to a certain resolution and also have a padding to be centered.

  The output dont have to have alpha (black for alpha is ok).

  I’m a bit confused by the abundance of filter options

  ---

  Edit :

  for the moment i’ve found :

  ./ffmpeg -i ./seq1/%d.bmp -vf "movie=./%d.png [a]; [in][a] overlay=0:366" combined.m2v

  it works , now i’ve got to find the padding and resize things

  ---

  thank you in advance.

• How can I fill skipped video frames of a movie with duplicated frames using ffmpeg ?

  28 août 2017, par Aviv Sharon

  I have an avi movie that contains some skipped frames (can be easily seen with virtual dub, that it duplicates them to the previous frame).
  My question is how can I use ffmpeg tool to convert a movie to be the same, just to fill the skipped frames with the previous ones, without changing the compression, using the very same source frames.
  I know there is a "-vsync cfr" option that works when re-encoding ("-vcodec [some codec]"), and there is "-vcodec copy", which maintains the codec and quality. However, these 2 ("-vsync cfr -vcodec copy") are not working together. In such case, the output video is the same as the input video (bit-exact).

  Any clue how can I do it ? Thanks

• Append tracks in Movie using FFMPEG android

  19 juin 2014, par Arslan Ahmad

  I want to APPEND a 2 audio track and one video in to the Movie I am using FFMPEG library. It always pick second sound track instead of both. Any help ?

  Movie result = new Movie();
  
  
  
              if (audioTracksRecordAppend.size() > 0) {
  
                  result.addTrack(new AppendTrack(audioTracksRecordAppend
  
                          .toArray(new Track[audioTracksRecordAppend.size()])));
  
              }
  
  
  
              if (audioTracksRecord.size() > 0) {
  
                  result.addTrack(new AppendTrack(audioTracksRecord
  
                          .toArray(new Track[audioTracksRecord.size()])));
  
              }
  
              if (videoTracks.size() > 0) {
  
                  result.addTrack(new AppendTrack(videoTracks
  
                          .toArray(new Track[videoTracks.size()])));
  
              }