Direct Stream Copying?

venomhed wrote on 7/3/2002, 3:40 PM

In Virtual Dub and Nan Dub there is a really neat feature called Direct Stream. What this does is say you have one Video clip that you want to compress to another format and one Audio clip that you want to leave as is. You do not want to re-render or re-compress the audio to say another format, so you put the render for audio at Direct Stream which means it will copy your audio (or video) track as is with no re-render/recompress. The Video however will be recompressed to whatever format you want. You can do Direct Stream for either audio or video or both.

Does Vegas do this?

Comments

Chienworks wrote on 7/3/2002, 4:36 PM

Vegas will do this up to a point. When using DV as input and output, Vegas only rerenders parts that are changed in some way, crossfades, transitions, effects, cropped, etc. Otherwise the video goes through as a direct bit-for-bit copy. Presumably uncompressed AVI to uncompressed AVI would also not involve any recompression. Audio likewise will only be processed if there are changes or the output file is a different format. Keep in mind that very few media file types share identical audio stream formats, so there are probably very few cases where the input and output formats don't match in which the audio can be passed directly through unprocessed.