CODEWITHSUNDEEP
mlt
user2455079
user2455079

Reputation: 418

MLT framework (melt) add music only to specified time in video

Need to add music to video only to some parts For example from 100frame to 500frame (4s - 20s)

Overall task is to merge a lot of videos and add music only to some of them.

Upvotes: 0

Views: 1285

Answers (1)

Brian
Brian

Reputation: 1210

You can put the audio and video on different tracks and use the mix transition to combine the audio.

# melt video.mp4 \
   -audio-track -blank 100 audio.mp3 \
   -transition mix in=100 out=500 a_track=0 b_track=1

Further explanation here: https://www.mltframework.org/bin/view/MLT/MltMelt#Transitions

Mix transition documentation here: https://www.mltframework.org/bin/view/MLT/TransitionMix

EDIT1:

To mute the audio from a video clip, you can apply the volume filter:

# melt video.mp4 -attach-clip volume gain=0 ...

To change the volume of a clip, you can also apply the volume filter:

... -audio-track -blank 100 audio.mp3 -attache-clip volume gain=3dB ...

Volume filter documentation: https://www.mltframework.org/bin/view/MLT/FilterVolume

To stop the music playing, you should set an "out" point. Also, you should put all the audio clips on one track and then specify the transitions:

# melt video.mp4 -attach-clip volume gain=0 \
   -audio-track -blank 100 audio1.mp3 out=400 -blank 300 audio2.mp3 out=400 \
   -transition mix in=100 out=500 a_track=0 b_track=1
   -transition mix in=800 out=1200 a_track=0 b_track=1

Upvotes: 3

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