<div dir="ltr"><div><div><div><div>You are correct. I wasn't checking the return code from the link call (my bad) and it is failing. Here is the log. Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.155957131 [335m 8566[00m 0xf6810bf8 [36mDEBUG [00m [00;01;37;41m GST_ELEMENT_PADS gstutils.c:1695:gst_element_link_pads_full:[00m linked pad VideoRateControl:src to pad capsfilter1:sink Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.155967116 [335m 8566[00m 0xf6810bf8 [32;01mINFO [00m [00;01;37;41m GST_ELEMENT_PADS gstutils.c:1592:gst_element_link_pads_full:[00m trying to link element capsfilter1:src to element VideoScaler:(any) Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.155976413 [335m 8566[00m 0xf6810bf8 [32;01mINFO [00m [00;01;37;41m GST_ELEMENT_PADS gstelement.c:958:gst_element_get_static_pad:[00m found pad capsfilter1:src Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.155985142 [335m 8566[00m 0xf6810bf8 [36mDEBUG [00m [00;01;37;41m GST_ELEMENT_PADS gstutils.c:1678:gst_element_link_pads_full:[00m looping through allowed src and dest pads Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.155993411 [335m 8566[00m 0xf6810bf8 [36mDEBUG [00m [00;01;37;41m GST_ELEMENT_PADS gstutils.c:1681:gst_element_link_pads_full:[00m trying src pad capsfilter1:src Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.156001820 [335m 8566[00m 0xf6810bf8 [36mDEBUG [00m [00;01;37;41m GST_ELEMENT_PADS gstutils.c:1111:gst_element_get_compatible_pad:[00m finding pad in VideoScaler compatible with capsfilter1:src Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.156011512 [335m 8566[00m 0xf6810bf8 [32;01mINFO [00m [00;01;31;41m GST_PADS gstutils.c:1046:gst_pad_check_link:[00m trying to link capsfilter1:src and VideoScaler:src Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.156020281 [335m 8566[00m 0xf6810bf8 [32;01mINFO [00m [00;01;31;41m GST_PADS gstutils.c:1066:gst_pad_check_link:[00m Sink pad VideoScaler:src is not sink pad, failed Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.156028538 [335m 8566[00m 0xf6810bf8 [36mDEBUG [00m [00;01;37;41m GST_ELEMENT_PADS gstutils.c:1164:gst_element_get_compatible_pad:[00m already linked or cannot be linked (peer = (nil)) Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.156037399 [335m 8566[00m 0xf6810bf8 [36mDEBUG [00m [00;01;37;41m GST_ELEMENT_PADS gstutils.c:1166:gst_element_get_compatible_pad:[00m unreffing pads Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.156046081 [335m 8566[00m 0xf6810bf8 [32;01mINFO [00m [00;01;31;41m GST_PADS gstutils.c:1046:gst_pad_check_link:[00m trying to link capsfilter1:src and VideoScaler:sink Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.156059712 [335m 8566[00m 0xf6810bf8 [36mDEBUG [00m [00;01;31;41m GST_PADS gstghostpad.c:214:gst_proxy_pad_do_getcaps:<VideoDecoder:src0>[00m get caps of target ffdec_h2640:src : video/x-raw-rgb; video/x-raw-yuv Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.156260260 [335m 8566[00m 0xf6810bf8 [36mDEBUG [00m [00;01;37;41m GST_ELEMENT_PADS gstutils.c:1160:gst_element_get_compatible_pad:[00m incompatible pads Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.156272892 [335m 8566[00m 0xf6810bf8 [36mDEBUG [00m [00;01;37;41m GST_ELEMENT_PADS gstutils.c:1166:gst_element_get_compatible_pad:[00m unreffing pads Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.156281855 [335m 8566[00m 0xf6810bf8 [36mDEBUG [00m [00;01;37;41m GST_ELEMENT_PADS gstutils.c:1188:gst_element_get_compatible_pad:<VideoScaler>[00m Could not find a compatible unlinked always pad to link to capsfilter1:src, now checking request pads Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.156297279 [335m 8566[00m 0xf6810bf8 [36mDEBUG [00m [00;01;31;41m GST_PADS gstghostpad.c:214:gst_proxy_pad_do_getcaps:<VideoDecoder:src0>[00m get caps of target ffdec_h2640:src : video/x-raw-rgb; video/x-raw-yuv Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.156368745 [335m 8566[00m 0xf6810bf8 [36mDEBUG [00m [00;01;37;41m GST_ELEMENT_PADS gstutils.c:889:gst_element_get_compatible_pad_template:[00m Looking for a suitable pad template in VideoScaler out of 2 templates... Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.156385566 [335m 8566[00m 0xf6810bf8 [36mDEBUG [00m [00;01;37;41m GST_ELEMENT_PADS gstutils.c:930:gst_element_get_compatible_pad_template:[00m No compatible pad template found Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.156397624 [335m 8566[00m 0xf6810bf8 [32;01mINFO [00m [00;01;37;41m GST_ELEMENT_PADS gstutils.c:1209:gst_element_get_compatible_pad:<VideoScaler>[00m Could not find a compatible pad to link to capsfilter1:src Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.156407619 [335m 8566[00m 0xf6810bf8 [36mDEBUG [00m [00;01;37;41m GST_ELEMENT_PADS gstutils.c:1720:gst_element_link_pads_full:[00m no link possible from capsfilter1:src to VideoScaler Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.156416834 [335m 8566[00m 0xf6810bf8 [36mDEBUG [00m [00;01;37;41m GST_ELEMENT_PADS gstutils.c:1775:gst_element_link_pads_full:[00m we might have request pads on both sides, checking... Jan 3 16:09:36 imsvcctl[8566]: 0:00:00.156425449 [335m 8566[00m 0xf6810bf8 [36mDEBUG [00m [00;01;37;41m GST_ELEMENT_PADS gstutils.c:1816:gst_element_link_pads_full:[00m no link possible from capsfilter1 to VideoScaler </div>Here is my source code. GstCaps *pScaleCaps = gst_caps_new_simple("video/x-raw-yuv", "width", G_TYPE_INT, pObject->outputOptions_.adapter.iWidth, "height", G_TYPE_INT, pObject->outputOptions_.adapter.iHeight, "format", GST_TYPE_FOURCC, "I420", NULL); GstCaps *pRateCaps = gst_caps_new_simple("video/x-raw-yuv", "framerate", GST_TYPE_FRACTION, pObject->outputOptions_.adapter.iFrameRate, 1, "format", GST_TYPE_FOURCC, "I420", NULL); bRet = gst_element_link_filtered(pObject->decoder_, pObject->videoRate_, pRateCaps); bRet = gst_element_link_filtered(pObject->videoRate_, pObject->videoScale_, pScaleCaps); bRet = gst_element_link_many(pObject->videoScale_, pObject->queue2_, pObject->encoder_, pObject->videoRTPPayloader_, pObject->sink_, NULL); </div>Here is my script that works. The pipeline from the C program is intended to be the same. export GST_DEBUG=videorate:4,videoscale:4,ffmpeg:4 gst-launch -vvv udpsrc port=$1 ! mpegtsdemux ! \ ffdec_h264 ! videorate ! 'video/x-raw-yuv,framerate=15/1' ! videoscale ! 'video/x-raw-yuv,width=320,height=240' ! \ x264enc bitrate=256 tune=zerolatency ! video/x-h264 ! rtph264pay pt=96 config-interval=2 ! udpsink host=$2 port=$3 </div>I don't understand why the negotiation between the rate control and the scaler is failing. </div>Chuck </div><div class="gmail_extra"> <div class="gmail_quote">On Sun, Jan 5, 2014 at 4:50 AM, Sebastian Dröge <<a href="mailto:sebastian@centricular.com" target="_blank">sebastian@centricular.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On Fr, 2014-01-03 at 12:15 -0500, Chuck Crisler wrote: > I am using GStreamer 0.10.30 and trying to transcode/scale/transmux a video > stream. The pipeline seems to link but fails with about the first video > frame due to a pad/caps not negotiated. My pipeline is: > > udpsrc->mpegtsdemux->decodebin2->videorate->videoscale->queue->x264enc->RTPh264pay->udpsink > > I link the videorate using gst_element_link_filtered with video/x-raw-yuv, > framerate=15 > I link the videoscale using gst_element_link_filtered with video/x-raw-yuv, > width=320, height=240 > The original source is 640x480. > > If I take the videoscale filter out the pipeline works, so that is somehow > causing my error. > > I would greatly appreciate any help. > > Here is a snippet of the log at failure. </div>> [...] Please provide more of that log, the actual error is still above the lines you pasted :) Also a simple testcase to reproduce it would be useful to have, ideally without all the network stuff. -- Sebastian Dröge, Centricular Ltd - <a href="http://www.centricular.com" target="_blank">http://www.centricular.com</a> Expertise, Straight from the Source _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_blank">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </blockquote></div> </div>