[MPlayer-dev-eng] Need help to extend mencoder

[Moritz Bunkus]

Hi.

> 1) I don't know what's the meaning of (and how to calculate) these 
> initialization fields in mux_a->wf:
> 
> mux_a->wf->nBlockAlign 		//for mp3 it's = 
> (mux_a->h.dwRate<32000)?576:1152; for PCM it's  mux_a->h.dwSampleSize;

AC3 has a fixed number of 1536 samples per packet, so nBlockAlign should
be set to 1536 for AC3.

> mux_a->wf->cbSize		// =12 for mp3, 0 for PCM

Number of bytes after the WAVEFORMATEX structure that can be used by the
codec. Probably (most likely) 0 for AC3.

> mux_a->h.dwScale		// 1 for PCM,  
> (mux_a->h.dwRate<32000)?576:1152  for mp3 ; I guess dwScale is a 
> compression factor depending on target bitrate, right?

Again 1536 for AC3.

-- 
 ==> Ciao, Mosu (Moritz Bunkus)
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