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

[Nicolas Dufresne]

Le mardi 30 avril 2019 à 15:16 +0800, Halley Zhao a écrit :
> 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.

It's GMail fighting against Yahoo email. They pretend that Yahoo is
doing something wrong and randomly mark yahoo email as spam. What I did
is that I have a filter for this ML to place that into a directory and
in the Gmail web-ui there is a check box for no-spam-check for this
label.

> 
> 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.

I know NXP had a patchset recently that they wanted to upload to
GStreamer, they didn't say for which HW. But instead of doing a merge
request, they pasted the patches. We ask for an MR and they simply
closed the ticket and never came back to us. Maybe that fixes your
issues ?

https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/issues/587

> 
> 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.

format=NV12 might not be the thing that fails to match. Maybe you could
set "GST_DEBUG="v4l2*:7" and attach the log, we could try and find what
is found to be supported by v4l2h264enc.

> > ”
> > 
> > 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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