>________________________________
> From: Clément Bœsch <u...@pkh.me>
>To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
>Sent: Friday, 18 July 2014, 13:38
>Subject: Re: [FFmpeg-devel] Filters
>
>
>On Fri, Jul 18, 2014 at 12:08:41PM +0100, JULIAN GARDNER wrote:
>> How do I fix a filter so that it takes in 1 input but has no output, this is
>> part of a project and this part is a detection filter, it does nothing else.
>>
>> The problem at the moment is that with the current filter, based on drawbox,
>> is that it produces an output which i need to the use overlay to dump.
>>
>> Is there a video filter which has 1 input but 0 outputs
>
>Just make a passthrough filtering (ff_filter_frame(in)), and do not map
>its output
>
Can you elaborate a bit more as I have this code as my base code
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
DrawBoxContext *s = inlink->dst->priv;
int plane, x, y, xb = s->x, yb = s->y;
unsigned char *row[4];
// Detect Stationary Object
....
// Here I would like to dump the frame as it is no longer needed
return ff_filter_frame(inlink->dst->outputs[0], frame);
}
AVFILTER_DEFINE_CLASS(detection);
static const AVFilterPad detection_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.filter_frame = filter_frame, },
{ NULL }
};
static const AVFilterPad detection_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter ff_vf_detection = {
.name = "detection",
.description = NULL_IF_CONFIG_SMALL("detects Stationary Object."),
.priv_size = sizeof(DetectionContext),
.priv_class = &detect_class,
.init = init,
.query_formats = query_formats,
.inputs = detect_inputs,
.outputs = detect_outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};
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