[Libav-user] FFPlay input_filter and ffsink question

[Farkas Szilard Levente]

Many Thanks! This is the answer I was hoping for.

Have a nice day,
Szilard.


On Tue, Jun 14, 2011 at 11:28 AM, Stefano Sabatini
<stefano.sabatini-lala at poste.it> wrote:
> On date Friday 2011-06-10 10:52:44 +0300, Farkas Szilard Levente encoded:
>> Hello,
>>
>> In FFplay method configure_video_filters there are two filters used:
>>
>> 1. ffplay input
>>
>> static AVFilter input_filter =
>> {
>>     .name      = "ffplay_input",
>>
>>     .priv_size = sizeof(FilterPriv),
>>
>>     .init      = input_init,
>>     .uninit    = input_uninit,
>>
>>     .query_formats = input_query_formats,
>>
>>     .inputs    = (AVFilterPad[]) {{ .name = NULL }},
>>     .outputs   = (AVFilterPad[]) {{ .name = "default",
>>                                     .type = AVMEDIA_TYPE_VIDEO,
>>                                     .request_frame = input_request_frame,
>>                                     .config_props  = input_config_props, },
>>                                   { .name = NULL }},
>> };
>>
>> 2. ffsink from cmdutils.c
>>
>> AVFilter ffsink = {
>>     .name      = "ffsink",
>>     .priv_size = sizeof(FFSinkContext),
>>     .init      = ffsink_init,
>>
>>     .query_formats = ffsink_query_formats,
>>
>>     .inputs    = (AVFilterPad[]) {{ .name          = "default",
>>                                     .type          = AVMEDIA_TYPE_VIDEO,
>>                                     .end_frame     = null_end_frame,
>>                                     .min_perms     = AV_PERM_READ, },
>>                                   { .name = NULL }},
>>     .outputs   = (AVFilterPad[]) {{ .name = NULL }},
>> };
>>
>> Why are they used only in ffplay? What filter combination should I use
>> to do what ffplay does in configure_video_filters?
>
> ffsink will be made public soon, so you will be able to use it
> directly in your app.
>
> The ffplay_input source is a variant of vsrc_buffer which allows
> strict integration with libavcodec (thus allowing direct rendering),
> but it is still unusable in ffmpeg due to some issues which need yet
> to be fixed.
>
>> Right now I am using BUFFER filter as SRC, insert NULLSINK as the last
>> filter and use its input pin as my output.
>>
>> input --> .. --> last_filter --> [in] nullsink [null]     [in] --> output
>>                                              |                              |
>>                                              |                              |
>>                                             +------------------------+
>>
>> Any other way to do what ffplay does?
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