There is a noticeable delay of the video relative to the audio in all videos: https://kolibri-demo.learningequality.org/en/learn/#/topics/c/a57d2d00605350e580541d54b6d0be08  I suspect this line: https://github.com/learningequality/sushi-chef-free-english-with-hello-channel/blob/master/sushichef.py#L312-L313 Example original video: https://www.youtube.com/watch?v=VSTAnETMFJA ## Consequences Difficult to integrate information from both streams. In particular this is a channel for learning English so makes the delay more undesirable. ## Possible solutions: 1/ Look at the library settings to avoid introducing the delay 2/ Add a postprocessing step ``` echo "Delaying audio of $1 by 60ms" ffmpeg -i "tmp-$1" -itsoffset 0.06 -i "tmp-$1" -map "0:0" -map "1:1" -acodec copy -vcodec copy "faster-$1" ``` via http://alien.slackbook.org/blog/fixing-audio-sync-with-ffmpeg/
There is a noticeable delay of the video relative to the audio in all videos:
https://kolibri-demo.learningequality.org/en/learn/#/topics/c/a57d2d00605350e580541d54b6d0be08
I suspect this line:
https://github.com/learningequality/sushi-chef-free-english-with-hello-channel/blob/master/sushichef.py#L312-L313
Example original video: https://www.youtube.com/watch?v=VSTAnETMFJA
Consequences
Difficult to integrate information from both streams. In particular this is a channel for learning English so makes the delay more undesirable.
Possible solutions:
1/ Look at the library settings to avoid introducing the delay
2/ Add a postprocessing step
via http://alien.slackbook.org/blog/fixing-audio-sync-with-ffmpeg/