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• How do you loop an audio watermark over audio in Fluent FFMpeg ?

  3 juillet 2022, par uponly

  I'd like to loop an audio watermark over a longer piece of audio, say every 20 seconds.

  


  Right now I have mixed the two pieces of audio and the watermark plays at the very beginning :

  


  command = ffmpeg(tempFilePath) // File path to base audio file
                .setFfmpegPath(ffmpeg_static)
                .input(tempWatermarkAudioPath) // File path to watermark audio file
                // Need to loop the watermark
                .complexFilter("amix=inputs=2:duration=longest")
                .audioChannels(2)
                .audioFrequency(48000)
                .format('mp3')
                .output(targetTempFilePath);


  


  I have looked at ffmpeg : How to repeat an audio "watermark" and tried to do the following to no avail :

  


  .complexFilter("amovie=" + tempWatermarkAudioPath + ":loop=0,asetpts=N/SR/TB[beep];[0][beep]amix=duration=longest,volume=2")


  


  and

  


  .complexFilter("amovie=[b]:loop=0,asetpts=N/SR/TB[b];[0][b]amix=duration=longest,volume=2")


  


  In both these cases I get "File path not found" using Google Cloud Functions.

  


  Any help would be greatly appreciated.

  


• FFMPEG : titlecard for concatentaed video results in slow-mo

  3 septembre 2020, par epilitimus

  I have three clips I have extracted from a longer video. When I concatenate them together everything works fine, as would be expected since they all came from the same source.

  


  Now I want to add a title card to the front of the merged video.

  


  I generated an image in GIMP with the same dimensions as the video frames and then used ffmpeg to generate a 5 sec. video from it. When I concatenated it onto the front of the other three I run into problems.

  


  The title card segment plays correctly and then the remaining segments are (both video and audio) in slow-mo. Also the titlecard runs longer than 5 sec and the main segment audio starts before the corresponding video.

  


  I know the problem is with the generation of the title card clip but so far I can't figure out what I am missing. Obviously my bitrates are wrong but how do I get them to match up ?

  


  what I have so far :

  


  my generation script :

  


  #!/bin/bash

ffmpeg -y -ss 0:03:33 -t 0:0:33.5 -i seg1.vob -filter:a "volume=4" seg1.mp4
ffmpeg -y -ss 0:13:25.5 -t 0:0:57 -i seg1.vob -filter:a "volume=4" seg2.mp4
ffmpeg -y -ss 0:16:25.5 -t 0:0:43 -i seg1.vob -filter:a "volume=4" seg3.mp4
ffmpeg -y -ss 0:7:10 -t 0:0:10 -i seg1.vob -filter:a "volume=4" -vn -b:a 394k title.mp3
ffmpeg -y -loop 1 -i title.png -t 0:0:5 -i title.mp3 -c:a aac -b:a 394k -shortest title.mp4 
ffmpeg -y -f concat -safe 0 -i contents.txt -c copy merged.mp4 


  


  and contents.txt :

  


  file 'title.mp4'
file 'seg1.mp4'
file 'seg2.mp4'
file 'seg3.mp4'


  


  ffprobe on seg1.mp4 :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'seg1.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    encoder         : Lavf58.20.100
  Duration: 00:00:33.52, start: 0.000000, bitrate: 677 kb/s
    Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 720x480 [SAR 32:27 DAR 16:9], 275 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 30k tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 6 channels, fltp, 394 kb/s (default)
    Metadata:
      handler_name    : SoundHandler


  


  and for title.mp4 :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'title.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    encoder         : Lavf58.20.100
  Duration: 00:00:05.02, start: 0.000000, bitrate: 1290 kb/s
    Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 720x480 [SAR 191:194 DAR 573:388], 898 kb/s, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 389 kb/s (default)
    Metadata:
      handler_name    : SoundHandler


  


• add a part of an audio file to a certain part of video , in loop using FFmpeg

  5 octobre 2017, par 1234567

  I have two files one Audio and one video file,

  The audio file is 1 min long,

  and the video file is 2 min 30 sec long,

  I want to add a part of audio, with loop not the whole audio file to the video , using FFmpeg

  say from 15 sec to 33 sec of the audio file

  to a part of video say from 45 sec to 1min 30 sec

  this code has worked with a single file which is 18 sec long , which is added to a certain part of video with a loop

  "-y","-i",j,
  
                          "-filter_complex",
  
                          "amovie="+audio+":loop=999,asetpts=N/SR/TB," +
  
                                  "atrim=0:45,adelay=45000|45000,aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=1.5[a1];" +
  
                                  "[0:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=2.0[a2];" +
  
                                  " [a1][a2]amerge,pan=stereo:c0code>

  the problem is If I have a 1 min long audio file and just want to extract a 18 sec part form it , and add it to video in a loop how can that be done