Hello, I need help with filter concept. Basically, I would like to achieve the following. I have two input streams (not files): audio/video stream and second auxiliary audio stream. I would like to mix audio channel from first input and audio channel from second input and output it as output audio/video stream. What I failed to do is to sync two audio streams. I would like the second audio stream be resampled onto first stream time stamps online and missed audio be replaced with silence. I.e. input audio/video stream has to be retransmitted as output without delay under any circumstances. I tried to use -af asyncts filter for second input, but this didn't help: when frames in second audio stream are missed, then output framerate decreases.
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