question on "transform could not transform video/x-raw ..."

[Halley Zhao]

i can see *Vinod Kesti's *reply at :
https://lists.freedesktop.org/archives/gstreamer-devel/2019-April/date.html;
but i can't receive the mail in my box. it is strange.

according to Kesti's reply:
I use v4l2h264enc on nxp imx8 board, I don't think the reason is that
v4l2h264enc doesn't support nv12 format. because if i use videotestsrc
instead, the program runs ok.

Halley Zhao <aihua.halley.zhao at gmail.com> 于2019年4月30日周二 下午2:24写道：

> Hi expert:
> I try to use appsrc-->videoencode-->appsink, but got the following error.
> "transform could not transform video/x-raw, format=(string)NV12,
> width=(int)640, height=(int)480, framerate=(fraction)25/1 in anything we
> support".
> while if I use videotestsrc-->videoencode-->appsink, there is no such
> error. I don't know where is the mistake:
> “
> 0:00:00.159532875 30661      0xabcff20 FIXME                default
> gstutils.c:3963:gst_pad_create_stream_id_internal:<source:src> Creating
> random stream-id, consider implementing a deterministic way of creating a
> stream-id
> 0:00:00.160083500 30661      0xabcff20 WARN           basetransform
> gstbasetransform.c:1355:gst_base_transform_setcaps:<capsfilter0> transform
> could not transform video/x-raw, format=(string)NV12, width=(int)640,
> height=(int)480, framerate=(fraction)25/1 in anything we support
> (cb_need_data, 126)#######################
> (readTestData, 91)
> (readTestData, 102)target frame num: 0, read_ret: 460800
> 0:00:00.161770500 30661      0xabcff20 WARN           basetransform
> gstbasetransform.c:1355:gst_base_transform_setcaps:<capsfilter0> transform
> could not transform video/x-raw, format=(string)NV12, width=(int)640,
> height=(int)480, framerate=(fraction)25/1 in anything we support
> 0:00:00.161995625 30661      0xabcff20 WARN           basetransform
> gstbasetransform.c:1355:gst_base_transform_setcaps:<capsfilter0> transform
> could not transform video/x-raw, format=(string)NV12, width=(int)640,
> height=(int)480, framerate=(fraction)25/1 in anything we support
> (free_data, 111)
> 0:00:00.162342000 30661      0xabcff20 WARN                 basesrc
> gstbasesrc.c:3055:gst_base_src_loop:<source> error: Internal data stream
> error.
> 0:00:00.162377125 30661      0xabcff20 WARN                 basesrc
> gstbasesrc.c:3055:gst_base_src_loop:<source> error: streaming stopped,
> reason not-negotiated (-4)
> (bus_call, 75)Error: Internal data stream error.
> ”
>
> my code piece is as following, and the complete source file as attachment,
> "
>   // video source
>   g_object_set (G_OBJECT (videosrc), "num-buffers", 50, NULL);
>   GstCaps *capsSource = gst_caps_new_simple("video/x-raw", "format",
> G_TYPE_STRING,"NV12",
>                   "width", G_TYPE_INT, g_video_width,
>                   "height", G_TYPE_INT, g_video_height,
>                   "framerate", GST_TYPE_FRACTION, 25, 1,
>                   NULL);
>   if (!strcmp(g_src_name, "videotestsrc")) {
>       DEBUG("uses videotestsrc");
>   } else if (!strcmp(g_src_name, "appsrc")) {
>     g_signal_connect (videosrc, "need-data", G_CALLBACK (cb_need_data),
> NULL);
>     g_object_set(G_OBJECT (videosrc), "caps", capsSource, NULL);
>   } else {
>     ERROR("Not considered yet");
>   }
>   ret = gst_element_link_filtered(videosrc, videoencode, capsSource);
>   gst_caps_unref(capsSource);
>   capsSource = NULL;
>   if (ret != TRUE) {
>       WARN("fail to link elements");
>       return -1;
>   }"
>
>
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