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

Baptiste Coudurier baptiste.coudurier
Mon Jul 20 20:10:17 CEST 2009

Hi Ramiro,

On 7/18/2009 3:15 PM, 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;
> - 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.

I really don't think av_find_stream_info you touch output_channels at
all, this is a decoding problem not a stream info problem.

Baptiste COUDURIER                              GnuPG Key Id: 0x5C1ABAAA
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