[FFmpeg-devel] TrueHD track in EVO not playable/testable with ffplay

[Michael Niedermayer]

On Sat, Jul 18, 2009 at 07:15:45PM -0300, Ramiro Polla wrote:
> On Tue, Jul 14, 2009 at 5:26 PM, Michael Niedermayer<michaelni at gmx.at> wrote:
> > On Tue, Jul 14, 2009 at 02:59:13PM -0300, Ramiro Polla wrote:
> >> On Mon, Jul 13, 2009 at 6:02 PM, Justin Ruggles<justin.ruggles at gmail.com> wrote:
> >> > If you decide on using channels + request_channels + output_channels,
> >> > here is what I think should happen.
> >> >
> >> > demuxer/parser : set channels to the number of source channels,
> >> > completely ignoring request_channels.
> >> >
> >> > decoder : during init(), set channels to the number of source channels,
> >> > set output_channels to what it will output, trying if it can to honor
> >> > request_channels.
> >> >
> >> > The user can see if output_channels matches request_channels after
> >> > decoder init.
> >>
> >> And what shall the user do if output_channels has no value after decoder init?
> >
> > he should call av_find_stream_info() either way and that should fill it in,
> > in theory ...
> 
> I have a few more ideas:
> - av_find_stream_info() tests for output_channels if request_channels
> is set. this would require request_channels to be set before even
> opening the codec;

possible


> - av_find_stream_info() fills possible channel combinations in
> coded_channels[] and the user chooses from that to set
> request_channels. In this case it would set coded_channels[0] = 2;
> coded_channels[1] = 6; coded_channels[2] = 0; or something like that.

sounds complex and yet limited, i mean 5 channels is ambigous, there can be
different channel layouts with 5 ...


[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

When you are offended at any man's fault, turn to yourself and study your
own failings. Then you will forget your anger. -- Epictetus
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