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• Why every audio part louder in FFmpeg while I join them in one audio ?

  13 mai 2024, par Volodymyr Bilovus

  I trying to make dubbing for audio. I have original audio track and I want to put translated audio parts on top of the original.

  


  translated audio 100% vol : —p1--- ---p2— -----p3--- —p4—

  


  original audio 5% vol : -----------------------------------------

  


  Here is my FFmpeg command with filter_complex

  


  ffmpeg -i video_wpmXlZF4XiE.opus -i 989-audio.mp3 -i 989-audio.mp3 -i 989-audio.mp3 -i 989-audio.mp3 \
-filter_complex "\
[0:a]loudnorm=I=-14:TP=-2:LRA=7, volume=0.05[original]; \
[1:a]loudnorm=I=-14:TP=-2:LRA=7, adelay=5000|5000, volume=1.0[sent1]; \
[2:a]loudnorm=I=-14:TP=-2:LRA=7, adelay=10000|10000, volume=1.0[sent2]; \
[3:a]loudnorm=I=-14:TP=-2:LRA=7, adelay=20000|20000, volume=1.0[sent3]; \
[4:a]loudnorm=I=-14:TP=-2:LRA=7, adelay=30000|30000, volume=1.0[sent4]; \
[original][sent1][sent2][sent3][sent4]amix=inputs=5:duration=longest[out]" \
-map "[out]" output.mp3


  


  Audios I put on top of the original audio track is the same -i 989-audio.mp3 I made it by purpose to show the problem
And here is the audio levels on final generated track.


  


  As you can see, first and second only slightly different but third
and fourth have totally different(higher) volume level (Notice, audio is the same).
Why it's happened. And how can I workaround this odd behaviour ?

  


• How we compressed videofile (all format) in android programmatically

  29 mars 2017, par prakash choudhary

  i am stuck with the funtionality for the compressed video before upload to the Amazon s3. i am looking functionality like the whatsup that compressed all the video of the gallery and camera after R&D i got FFmpeg library but that is increasing size of the app apk.Please there is any alternative t ? Any idea about this problem

• Heterogeneous list of files as input for ffmpeg

  3 décembre 2018, par sargue

  The short TL ;DR question is :

  How can I use a list of files instead of multiple -i FILE arguments to ffmpeg ?

  I am hitting the 8.196 command line limit on Windows. On linux I am not having this issue.

  The arguments are images, video files and audio files, so I can’t use the concat demuxer, for example.

  I am working on a fork of this project to generate a slideshow of images with Ken Burns effects and background music. The reason I am forking the original one is because I want to be able to add video clips alongside the images.

  The ruby script generates a long ffmpeg command line. This command line is too long for Windows. As an example I’m trying to process about 700+ inputs and the command line is 19.732 bytes long.

  A short, example, command line generated by the ruby script :

  ffmpeg -hide_banner -y -i "001.JPG" -i "please.mp4" -i "002.JPG" -i "002b.mp4" -i "003.JPG" -i "asfalto.mp3" -filter_complex_script script.txt -t 37.933 -map [out] -map [aout] -preset ultrafast -tune stillimage -c:v libx264 out.mp4