[MPlayer-dev-eng] [PATCH] [TEST AFILTER] Encode ac3 at runtime using lavc

[Ulion]

2007/11/19, Ulion <ulion2002 at gmail.com>:
> 2007/11/19, Ulion <ulion2002 at gmail.com>:
> > Hello,
> >
> > As a wellknown feature of AC3Filter, it support encode ac3 at runtime
> > and passthrough it to spdif. With this feature, peoples has only a
> > decoder support ac3 can enjoy multi-channel audio from dts, aac, wma
> > pro, eac3, etc.
> >
> > Here's a test audio filter which do this work by using lavc to encode
> > ac3 at runtime. It works with me on ppc and intel, but seems it now
> > introduce a little more flick of subtitles on mac system.
> > And also, I'm not familar with audio filters, so the code probably do
> > things in some wrong way, or missed something, such as encode the last
> > audio frame, calculate the delay, etc, and also the calculate af->mul.
> > If this filter is worth to do, please give suggests on it, or someone
> > else make a better one.
> >
> > The patch need to reorder channels, so it rely on my reorder_copy
> > patch I sent just now. Or I should make it independent?
> >
>
> I forgot to say the usage:
>
> normally, add these to cmdline to encode multi-channel to spdif
> -channels 6 -af lavcac3enc=1
>
> full usage is
> -af lavcac3enc=A:B:C
>
> A: 0: output raw ac3 stream. 1: passthrough to spdif. current default is 0
> B: bitrate, if not set default for 2ch is 192kbits, and 384kbits for
> more than 2ch.
> C: min_channel_num to apply this filter, if nch is less than this
> value, detach the filter. current default is 5

Slight update version.

-- 
Ulion
-------------- next part --------------
A non-text attachment was scrubbed...
Name: af_lavcac3enc2.diff
Type: text/x-diff
Size: 10223 bytes
Desc: not available
URL: <http://lists.mplayerhq.hu/pipermail/mplayer-dev-eng/attachments/20071120/a2354280/attachment.diff>