I used VirtualDubs to combine an AVI and a WAV. Both were just a direct stream. Then rendering took just a couple of seconds. Clearly there was no re-compression and the file size was almost exactly AVI+WAV. I took the same AVI and WAV to Vegas 4 and did a similar. The rendering was a bit slower but pretty fast. The file size was considerable larger:
From VirtualDub: 4.3 MB
From Vegas: 6 MB
I set both video and audio codecs in Vegas to exactly the same before rendering. If they were diffrerent the rendering Vegas took considerable longer and file sizes were again different (of course).
Where does teh file size bloat come from? Visually Vdub and Vegas look exactly same (the code I'm using is lossless so it's easy to spot).
From VirtualDub: 4.3 MB
From Vegas: 6 MB
I set both video and audio codecs in Vegas to exactly the same before rendering. If they were diffrerent the rendering Vegas took considerable longer and file sizes were again different (of course).
Where does teh file size bloat come from? Visually Vdub and Vegas look exactly same (the code I'm using is lossless so it's easy to spot).