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

[Halley Zhao]

Hi expert:

I try to use appsrc-->videoencode-->appsink, but got the following error. 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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[Vinod Kesti]

Which videncoder you are using here ??
Looks like video encoder is not able to handle format=NV12.
Put videoconvert before the videoencoder this might solve the problem.



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