What does the parameter lstart in the avistreamwrite function mean?

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AVIStreamWrite function (vfw.h) | Microsoft Docs[^]

I do not understand what the parameter lStart in this function means. It would be great if somebody could explain it.

What I have tried:

I tried to change the parameter to see what happens but I could not make sense of it.

Posted 7-Jun-19 3:56am

Member 14478761

Updated 7-Jun-19 5:53am

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Gerry Schmitz · Answer 1 · 2019-06-07T05:54:00

It means, IMO, given x samples, which sample should be the "first" to be written.

It doesn't seem to be an offset; so the value is probably 1 - x; meaning how many samples to skip (-1) before writing samples from the buffer to the stream.

And since it's a "long", it's obvious that n can be a very big number so a "small" adjustment may be hard to notice.