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• Got two working ffmpeg commands, help me transform them

  7 mars 2019, par lukistar

  here are two different commands.

  ffmpeg -i input.mp3 -i second.mp3 -filter_complex "[0:a]atrim=end=10,asetpts=N/SR/TB[begin];[0:a]atrim=start=10,asetpts=N/SR/TB[end];[begin][1:a][end]concat=n=3:v=0:a=1[a]" -map "[a]" output

  This command inserts second.mp3 into input.mp3. It seems to always keep the parameters of input.mp3. It inserts it in exact 10 seconds of input.mp3.

  Here is the second command :

  ffmpeg -i input.mp3 -i second.mp3 -filter_complex "[1:a]adelay=10000|10000[1a];[0:a][1a]amix=duration:first" output

  This command is closer to my final goal. It plays input.mp3 and in exact 10 seconds it plays along second.mp3 without stopping input.mp3’s sound.

  My final goal is to create final.mp3.

  Its duration must always equal input.mp3 duration. It must keep the samplerate, the count of channels, etc of input.mp3

  When playing final.mp3, it must play the whole input.mp3.
  But each 10-15 seconds, it must play second.mp3 without stopping input.mp3.
  It could be said that I must use "Second command" but in a loop.
  It would be great if there is one-line command for that in ffmpeg.
  I am working with flac, mp3 and wav and both of the commands, I got, work great for what they are doing.

  For example :

  input.mp3 could be 40 seconds long.

  second.mp3 could be 2 seconds long.

  When I play final.mp3 it will be 40 seconds long, but each 10-15 seconds(on random) it will play second.mp3 at the same time as input.mp3.

  Sadly I have no experience with ffmpeg, both of the commands I got are answers to questions here in stackoverflow. Hope somebody can help me. Thank you !

• Flutter ffmpeg : Video merger not working

  17 septembre 2021, par Madhusri J

  I have been trying to merge two videofiles using ffmpeg in flutter but a single videofile is merging two times and the sound of video is not working

  


  This is my code

  


   final appDir = await getExternalStorageDirectory();
 String rawDocumentPath = appDir!.path;
 final outputPath = '$rawDocumentPath/videomerge.mp4';

 final FlutterFFmpeg _flutterFFmpeg = new FlutterFFmpeg();

 String commandToExecute = '-y -i ${VideoFiles[0].path} -i ${VideoFiles[1].path} 
  -filter_complex \'[0:v][0:v]concat=n=2:v=1:a=0[out]\' -map \'[out]\' $outputPath';

 _flutterFFmpeg.execute(commandToExecute).then((rc) => print("FFmpeg process exited with 
 rc $rc"));


  


  Any help would be greatly appreciated :)

  


• Concatenating image with video for Freeze frame effect

  12 mai 2015, par Code_Ed_Student

  I am currently trying to achieve with ffmepg a freeze frame effect. This is something easy to do with adobe after effects shown here. However I would like to achieve a freeze frame effect(of 5 seconds duration) followed by the 15 second video for the final output video. This should amount to a final duration of 20 seconds. However with the settings below, I am getting a still image with the video following but it does not show a "freeze frame effect". How can I achieve a "freeze frame effect" in ffmpeg ?

  //create image

  ffmpeg -i "/media/test/test.mp4" -ss 00:00:00.023222 -vframes 1 "/media/test/test.png"

  //create freeze image effect

  ffmpeg -i "/media/test/test.mp4" -loop 1 -i "/media/test/test.jpg" -an \
  
  -filter_complex "[1:v]trim=start=0:end=5[ol];[0:v]setpts=[nv];[nv][ol]overlay=eof_action=pass[final]" \
  
  -map '[final]' -c:a aac -strict experimental -c:v libx264 -q 1 "/media/test/test_effect.mp4"