...
9. Video stream from Bob is published:
Merging stream records using ffmpeg
Stream record files can be merged in chronological order using ffmpeg. To allow this, when stream is created, stream timeshift relative to room creation time is specified with setTimeShift() method, by default:
| Code Block | ||||
|---|---|---|---|---|
| ||||
stream.setTimeShift(new Date().getTime() - room.getCreateDate().getTime()); |
This method can be used from client web application.
Stream record files written by this way are merged with command (two participants example)
| Code Block | ||||
|---|---|---|---|---|
| ||||
ffmpeg -i stream1.mp4 -i stream2.mp4 -filter_complex "[0:v]pad=iw*2:ih[int];[int][1:v]overlay=W/2:0[vid];[0:a][1:a]amerge[a]" -map [vid] -map "[a]" -ac 2 -strict -2 -c:v libx264 -crf 23 -preset veryfast output.mp4
|
Where
- stream1 - first participant stream
- stream2 - second participant stream
To merge files obtained during our test, enter the command:
| Code Block | ||||
|---|---|---|---|---|
| ||||
ffmpeg -i stream-34296a60-7b36-11e8-bd9c-31aaed48935e-db8mp51bajcidn9qmcnda3967k.mp4 -i stream-5aeb2351-7b36-11e8-b398-b74e804508b2-g97j81cgrf8h1m7jl7184fa788.mp4 -filter_complex "[0:v]pad=iw*2:ih[int];[int][1:v]overlay=W/2:0[vid];[0:a][1:a]amerge[a]" -map [vid] -map "[a]" -ac 2 -strict -2 -c:v libx264 -crf 23 -preset veryfast output.mp4
|
Then play output.mp4.file:
