video:1310kB audio:113kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 3.604597%
I'm currently doing a quick capture, just to manually calculate the
difference between the start times of the two streams, then using that
value inside the asetpts filter to offset the audio stream by that amount.
This roughly works, but the difference between the input start times
changes slightly every time, so I'd like to be able to calculate this
difference inside the asetpts filter, using I something like -af
'asetpts=PTS+([stream 1 start time]-[stream 2 start time])/TB'.
Is there a way to do this? What is the proper syntax?