Am 22.06.2021 um 12:14 schrieb ibur...@compuscience.com:
I concatenate 3 videos as below:
Video 1 - 13 seconds with audio
Video 2 - 4 seconds without audio (I generated this video using xfade
transition
Video 3 - 4 seconds with audio
If I concatenate video 1 and 3 everything works fine; audio synchronization
is correct from start to end. However, when I concatenate all 3 of them, the
audio from video 3 starts playing a little bit before the end of video 2. As
video 3 is a person talking, you clearly see that the audio doesn't match
the mouth movements.
When you use the concat demuxer, all input streams must have the same
size (width * height), same video codec, same framerate, same audio
codec, same number of audio tracks and the same audio sample rate.
There are two possible solutions:
1. You can add a silent audio track when you generate the second video.
Just add a second input to your command line, for example:
-f lavfi -i anullsrc=cl=stereo -shortest
2. Or use the "acrossfade" filter when you generate the second video.
Michael
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