Muxing stuff that's already compressed

jasper-isis · Post by **jasper-isis** » Thu Jan 23, 2003 10:19 pm

How do you mux a compressed video with a to-be-compressed audio file without losing any visual quality? I experimented with VirtualDub and realized that Direct Stream Copy for video doesn't work with AVS files.

Could it be because D.S.C. actually grabs the AVS source file?

<sigh> Should've remembered everything I wanted to do in AVISynth before compressing...

Jebadia · Post by **Jebadia** » Thu Jan 23, 2003 10:46 pm

you can't direct stream copy an AVS file with out it being enormous, mainly because through the AVS, I guess Vdub can't notice the compression method, so when using direct stream copy, it makes an uncompressed video stream, enormous.

You can compress the video first, and then direct stream the audio to it.

RadicalEd0 · Post by **RadicalEd0** » Thu Jan 23, 2003 11:08 pm

why are you loading a precompressed video through avisynth to begin with? no, vdub can't direct stream through avisynth since avisynth can't pass compression data through its structure, just yuy2 video afaik. You have to load the avi directly into vdub to do what you need to do. It can be done, but not with avisynth, I'm not sure I understand that step of the process here :\