<html> <head> <meta content="text/html; charset=UTF-8" http-equiv="Content-Type"> </head> <body text="#000000" bgcolor="#FFFFFF"> 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> </body> </html>