Why Gstreamer change explicitly declared caps of appsrc in runtime?
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Hello,
I am trying to develop an application with using appsrc element of Gstreamer. Gstreamer pipeline is very simple: *"appsrc caps=video/x-raw,format=NV12,width=1280,height=720,framerate=30/1 ! filesink location=/home/sarslan/out.nv12"* I insert NV12 frame to this pipeline but the output "out.nv12" file size is 0 bytes. Because of this, I searched for gstreamer logs and here is the output: *0:00:00.278040860 16433 0x7f70004b30 DEBUG appsrc gstappsrc.c:1344:gst_app_src_set_caps:<appsrc0> setting caps to video/x-raw, format=(string)NV12, width=(int)1280, height=(int)720, framerate=(fraction)30/1 * 0:00:00.278505540 16433 0x7f70004b30 DEBUG appsrc gstappsrc.c:688:gst_app_src_internal_get_caps:<appsrc0> caps: (NULL) 0:00:00.278589460 16433 0x7f70004b30 DEBUG appsrc gstappsrc.c:688:gst_app_src_internal_get_caps:<appsrc0> caps: (NULL) *0:00:00.278736430 16433 0x7f70004b30 DEBUG appsrc gstappsrc.c:1344:gst_app_src_set_caps:<appsrc0> setting caps to video/x-raw, format=(string)BGR, width=(int)1280, height=(int)720, framerate=(fraction)30/1 * 0:00:00.278782890 16433 0x7f70004b30 DEBUG appsrc gstappsrc.c:1509:gst_app_src_set_stream_type:<appsrc0> setting stream_type of 0 0:00:00.278820150 16433 0x7f70004b30 DEBUG appsrc gstappsrc.c:1401:gst_app_src_set_size:<appsrc0> setting size of -1 0:00:00.279119090 16433 0x7f70004b30 DEBUG appsrc gstappsrc.c:865:gst_app_src_start:<appsrc0> starting 0:00:00.279575060 16433 0x37769e30 DEBUG appsrc gstappsrc.c:688:gst_app_src_internal_get_caps:<appsrc0> caps: (NULL) What I understand from this log is, the caps of the appsrc element changed in runtime and this is the reason of why the output file is 0 bytes. So, The first question is: Why gstreamer override my caps and set its own caps in runtime ? And the second question is: How can I disable this behaviour ? Thanks. -- Sent from: http://gstreamer-devel.966125.n4.nabble.com/ _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Why Gstreamer change explicitly declared caps of appsrc in runtime?
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Hi
It can't be a coincidence that the caps of the appsrc is for BGR and not NV12. This must mean you are inserting BGR frames and not NV12? A couple of tests... Try removing the caps altogether and see if that works and what frames you actually get out. Also try inserting a videoconvert block just before the filesink so that it will convert if necessary. ________________________________________ From: gstreamer-devel <[hidden email]> on behalf of sarslan <[hidden email]> Sent: 29 September 2020 10:06 To: [hidden email] Subject: Why Gstreamer change explicitly declared caps of appsrc in runtime? Hello, I am trying to develop an application with using appsrc element of Gstreamer. Gstreamer pipeline is very simple: *"appsrc caps=video/x-raw,format=NV12,width=1280,height=720,framerate=30/1 ! filesink location=/home/sarslan/out.nv12"* I insert NV12 frame to this pipeline but the output "out.nv12" file size is 0 bytes. Because of this, I searched for gstreamer logs and here is the output: *0:00:00.278040860 16433 0x7f70004b30 DEBUG appsrc gstappsrc.c:1344:gst_app_src_set_caps:<appsrc0> setting caps to video/x-raw, format=(string)NV12, width=(int)1280, height=(int)720, framerate=(fraction)30/1 * 0:00:00.278505540 16433 0x7f70004b30 DEBUG appsrc gstappsrc.c:688:gst_app_src_internal_get_caps:<appsrc0> caps: (NULL) 0:00:00.278589460 16433 0x7f70004b30 DEBUG appsrc gstappsrc.c:688:gst_app_src_internal_get_caps:<appsrc0> caps: (NULL) *0:00:00.278736430 16433 0x7f70004b30 DEBUG appsrc gstappsrc.c:1344:gst_app_src_set_caps:<appsrc0> setting caps to video/x-raw, format=(string)BGR, width=(int)1280, height=(int)720, framerate=(fraction)30/1 * 0:00:00.278782890 16433 0x7f70004b30 DEBUG appsrc gstappsrc.c:1509:gst_app_src_set_stream_type:<appsrc0> setting stream_type of 0 0:00:00.278820150 16433 0x7f70004b30 DEBUG appsrc gstappsrc.c:1401:gst_app_src_set_size:<appsrc0> setting size of -1 0:00:00.279119090 16433 0x7f70004b30 DEBUG appsrc gstappsrc.c:865:gst_app_src_start:<appsrc0> starting 0:00:00.279575060 16433 0x37769e30 DEBUG appsrc gstappsrc.c:688:gst_app_src_internal_get_caps:<appsrc0> caps: (NULL) What I understand from this log is, the caps of the appsrc element changed in runtime and this is the reason of why the output file is 0 bytes. So, The first question is: Why gstreamer override my caps and set its own caps in runtime ? And the second question is: How can I disable this behaviour ? Thanks. -- Sent from: http://gstreamer-devel.966125.n4.nabble.com/ _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
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Hello,
I wrote raw frame to file before send it to the pipeline. Then I display it with "https://rawpixels.net/" and vooya(raw image viewer in linux). From both method, I saw that the format of the raw frame is NV12. I upload the file in here. I view this file in "https://rawpixels.net/" with the following settings: height:720, width: 1280, Predefined format: NV12, Pixel format: YUV. And also I tried to insert videoconvert block just after the appsrc. In this block, I tried to convert format to NV12 but this is not work also. out_test.nv12 <http://gstreamer-devel.966125.n4.nabble.com/file/t379659/out_test.nv12> -- Sent from: http://gstreamer-devel.966125.n4.nabble.com/ _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
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