<html> <head> <meta content="text/html; charset=UTF-8" http-equiv="Content-Type"> </head> <body text="#000000" bgcolor="#FFFFFF"> <meta http-equiv="CONTENT-TYPE" content="text/html; charset=UTF-8"> I am getting frustrated making 'negative progress' with my project. I have 2 machines. The 'Live Machine' runs a 64 bit version of Fedora, and has a video capture card. Access to this machine is not very convenient and Internet access is also not convenient. At home I have an old 'Development Machine' which runs a 32 bit version of Fedora, does not have a video capture card, but does have a USB webcam. It has easy access to the Internet. On the live machine I have a working program that records a video (mp4) file and an audio (wav) file concurrently. I want to tee the video off to create a small monitor window while the program is recording – a 'viewfinder' if you like. Thus far, the pipeline does not make it all the way to 'PLAYING' when I add into the pipeline the additional elements I think I need for my viewfinder – and I cannot see why. So, I tried to test it on my development machine. As part of the pipeline, I use “x264enc ! Mp4mux” - but on the development machine I see the message (in the trace log) <pre class="western">0:00:03.937134344 1604 0x8990980 INFO structure gststructure.c:2854:gst_structure_get_valist: Expected field 'channel-mask' in structure: audio/x-raw, format=(string)S16LE, layout=(string)interleaved, rate=(int)44100, channels=(int)1; 0:00:03.936178253 1604 0x8990a30 INFO task gsttask.c:302:gst_task_func:<vid-source:src> Task resume from paused 0:00:03.945953183 1604 0x8990a30 INFO v4l2 gstv4l2object.c:2729:gst_v4l2_object_get_caps:<vid-source> probed caps: video/x-raw, format=(string)I420, width=(int)352, height=(int)292, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw, format=(string)YV12, width=(int)352, height=(int)292, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw, format=(string)BGR, width=(int)352, height=(int)292, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw, format=(string)RGB, width=(int)352, height=(int)292, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, framerate=(fraction)[ 0/1, 100/1 ] 0:00:03.946255699 1604 0x8990a30 INFO x264enc gstx264enc.c:509:gst_x264_enc_add_x264_chroma_format: This x264 build supports 8-bit depth 0:00:03.946404915 1604 0x8990a30 INFO x264enc gstx264enc.c:509:gst_x264_enc_add_x264_chroma_format: This x264 build supports 8-bit depth 0:00:03.946987781 1604 0x8990a30 WARN basesrc gstbasesrc.c:2865:gst_base_src_loop:<vid-source> error: Internal data flow error. 0:00:03.948398246 1604 0x8990a30 WARN basesrc gstbasesrc.c:2865:gst_base_src_loop:<vid-source> error: streaming task paused, reason not-negotiated (-4) 0:00:03.948507201 1604 0x8990a30 INFO GST_ERROR_SYSTEM gstelement.c:1835:gst_element_message_full:<vid-source> posting message: Internal data flow error. 0:00:03.948590508 1604 0x8990a30 INFO GST_ERROR_SYSTEM gstelement.c:1858:gst_element_message_full:<vid-source> posted error message: Internal data flow error. 0:00:03.948641377 1604 0x8990a30 INFO task gsttask.c:300:gst_task_func:<vid-source:src> Task going to paused Error: Internal data flow error.</pre> I don't know whether 'This x264 build supports 8-bit depth' is a boast or a complaint – or purely information, but coming just in front of the 'not-negotiated (-4)' leads me to suppose that it is a problem. I don't know what I might do to my pipeline to allow it to work, so I tried to find an alternative pair of video encoder and mux, so that (on my development PC) I could investigate why I can't tee off the video. I was not able to find anything which would work. I then tried another tack – to see if I could simply code up the elements to make a monitor. So I tried a pipeline of “v4l2src ! videorate ! videoscale ! video/x-raw,width=(int)352,height=(int)292 ! autovideosink. Once again, I got a not-negotiated error <pre class="western">gstbin.c:2656:gst_bin_change_state_func:<camera> child 'vidsrc' changed state to 4(PLAYING) successfully 0:00:05.370134748 2500 0x9493520 INFO GST_ELEMENT_PADS gstelement.c:894:gst_element_get_static_pad: no such pad 'sink' in element "vidsrc" 0:00:05.386283440 2500 0x9493520 INFO v4l2 gstv4l2object.c:1247:gst_v4l2_object_fill_format_list:<vidsrc> got 4 format(s): 0:00:05.386626594 2500 0x9493520 INFO v4l2 gstv4l2object.c:1253:gst_v4l2_object_fill_format_list:<vidsrc> YU12 (emulated) 0:00:05.386753887 2500 0x9493520 INFO v4l2 gstv4l2object.c:1253:gst_v4l2_object_fill_format_list:<vidsrc> YV12 (emulated) 0:00:05.386875965 2500 0x9493520 INFO v4l2 gstv4l2object.c:1253:gst_v4l2_object_fill_format_list:<vidsrc> BGR3 (emulated) 0:00:05.386959581 2500 0x9493520 INFO v4l2 gstv4l2object.c:1253:gst_v4l2_object_fill_format_list:<vidsrc> RGB3 (emulated) 0:00:05.387345042 2500 0x9493520 INFO v4l2 gstv4l2object.c:2729:gst_v4l2_object_get_caps:<vidsrc> probed caps: video/x-raw, format=(string)I420, width=(int)352, height=(int)292, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw, format=(string)YV12, width=(int)352, height=(int)292, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw, format=(string)BGR, width=(int)352, height=(int)292, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw, format=(string)RGB, width=(int)352, height=(int)292, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, framerate=(fraction)[ 0/1, 100/1 ] 0:00:05.388117725 2500 0x9493520 WARN basesrc gstbasesrc.c:2865:gst_base_src_loop:<vidsrc> error: Internal data flow error. 0:00:05.391941259 2500 0x9493520 WARN basesrc gstbasesrc.c:2865:gst_base_src_loop:<vidsrc> error: streaming task paused, reason not-negotiated (-4) 0:00:05.392081470 2500 0x9493520 INFO GST_ERROR_SYSTEM gstelement.c:1835:gst_element_message_full:<vidsrc> posting message: Internal data flow error.</pre> I have, previously, used camerabin on the development machine, and there the caps of “video/x-raw, format=(string)I420, width=(int)352, height=(int)292” worked. Is my problem to do with using v4l2src as the source? Is there some other source I should use with my webcam? Should I use some other sink than autovideosink? Help! <title></title> <meta name="GENERATOR" content="OpenOffice 4.1.1 (Win32)"> <style type="text/css">  </style> <div class="moz-cite-prefix">On 17/11/2014 18:32, Ian Davidson wrote: </div> <blockquote cite="mid:546A3F55.5000306@blueyonder.co.uk" type="cite"> <meta content="text/html; charset=UTF-8" http-equiv="Content-Type"> I have had another opportunity to test my program, both in its original form and with my attempted improvements. I notice that the 'working version' does set a timestamp in the Auto Ring Buffer to 99:99:99.999999999 several times, but it does eventually stop and then the pipeline reports that it has transitioned to the PLAYING state. However, if I add my extra elements to the pipeline, whether I link them or not, the pipeline never transitions to the PLAYING state and is constantly filling the buffer with timestamps. I accept that I may have done something foolish - but if I could see it I would not be writing here. Any pointers would be appreciated. Ian <div class="moz-cite-prefix">On 04/11/2014 16:00, Ian Davidson wrote: </div> <blockquote cite="mid:5458F825.3040101@blueyonder.co.uk" type="cite"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <meta http-equiv="CONTENT-TYPE" content="text/html; charset=UTF-8"> I have a program (written in C and using GStreamer 1.0) which works. I take input from v4l2src and alsasrc and mux them together and save an mp4 file. I also tee off the audio early on and save it as a wav file. However, I have no confirmation that I actually have a video signal to record. So, I decided to enhance the program by teeing the video off, right after the v4l2src and send it to an autovideosink to act as a monitor. The result was not 100% successful. The monitor window appears with a picture in it – but then everything seems to freeze up. Looking at a trace (--gst-debug-level=4) appears to loop for ever setting a timestamp to 99:99:99.999999999. I have copied part of my program below. The elements I have added are defined in the line GstElement *videotee, *queue5, *monscale, *moncapsfilter, *videosink; I have also included the beginning of the Trace output. To my untrained eye, everything seems to link together OK, but then it gets stuck with the timestamps. Any pointers as to where I am going wrong would be appreciated. </blockquote> <fieldset class="mimeAttachmentHeader"></fieldset> <pre wrap="">_______________________________________________ gstreamer-devel mailing list <a class="moz-txt-link-abbreviated" href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> <a class="moz-txt-link-freetext" href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </pre> </blockquote> </body> </html>