Re: 回复： can not get decoded data from appsink in GStreamer v1.0.9

[Wonchul Lee]

At the cb_new_buffer, you can get the buffer.
Like as blow code.

static GstFlowReturn
cb_new_buffer(GstElement * sink)
{
  GstSample *sample;
  GstCaps *caps;
  GstBuffer *buf;

  g_signal_emit_by_name (sink, "pull-sample", &sample);

  caps = gst_sample_get_caps (sample);
  buf = gst_sample_get_buffer (sample);


if (sample) { gst_sample_unref (sample); } return GST_FLOW_OK; }


GstSample contains the reference of buffer and caps data.

You should unref after use the sample data.

It is the reason why blocked after got the first data.



2013/8/27 Brendan Long <self at brendanlong.com>

>  How are you getting the sample? Is it possible that you're accidentally
> blocking the pipeline?I think you're supposed to use "pull-sample" to get
> the new sample, but if you call "pull-sample" where there is no sample, it
> will block, and depending on how you're running your pipeline, that could
> block everything. That's just a guess though, since you're not showing very
> much of your code.
>
>
> On 08/24/2013 05:18 AM, jojo wrote:
>
>  Hi,
>  i use the simplest pipe line again as bellow:
>
>  pipe = gst_parse_launch("appsrc is-live=1 do-timestamp=1
> caps=\"image/jpeg, width=1920, height=1080\" name=\"appsrc\" ! appsink
> name=\"appsink\"");
>
>  it can get the first 1 "sample" just only.
>
>  Thanks,
>
>  - Jojo
>
>  在 2013年8月24日星期六，下午5:17，jojo 写道：
>
>   Hi,
>  My pipeline is :
>
>  pipe = gst_parse_launch("appsrc is-live=1 do-timestamp=1
> caps=image/jpeg, width=1920, height=1080 name=\"appsrc\" ! decodebin !
> queue !  videoconvert ! appsink caps=\"%s\" name=\"appsink\",
> GST_VIDEO_CAPS_MAKE("BGRx")).
>
>  g_signal_connect (appsink, "new-sample", G_CALLBACK (cb_new_buffer),
> data);
>
>  in the gstreamer v0.10, the callback is triggered if there are new
> buffer, but i can not get new data from this callback in the version 1.0.9,
>
>  some of my parameters of "gst_parse_launch" are wrong ?
>
>  Any hins will be helpful.
>
>  Thanks,
>
>  - Jojo
>
>
>
>
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