I have a video with two audiotracks, in two different languages, and I have two sound cards. I want to play this video with both audiotracks playing, each through its own audio device.
Is there any way to do that?
The video is in .mkv format, the player I use is MPC-HC (but I'd happily switch to any other, if it can do what I'm trying to do)
You first need a product that can issue sound to two devices simultaneously. Not many sound products can do that, as the majority just issues the sound to the default sound device. Or you can run two players of the same file, each issuing its sound to a different card (hard to synchronize correctly).
A product that does video editing and mixing might be capable of doing this. I have heard that MixPad (shareware $59.95) is one such product.
It should also be possible with the open-source GStreamer multimedia framework (some study required), by creating a pipe similar to this :
# The number and order of the tracks must be known
gst-launch-1.0 \
filesrc location=example.mkv ! decodebin name=decoded \
decoded.src_0 ! queue ! autovideosink \
decoded.src_1 ! queue ! audioconvert ! alsasink device="hw:1,0" \
decoded.src_2 ! queue ! audioconvert ! alsasink device="hw:2,0"
