I have a C program that records video and audio from a v4l2 source into flv format. I noticed that the program did not work on newer versions of ubuntu. I decided to try to run the problamatic pipeline in gst-launch and try to find the simplest pipeline that would reproduce the problem. Just focusing on the video side I have reduced it to what you see below.
So I have a gstreamer pipeline that was working:
gst-launch v4l2src ! tee name="vtee" ! queue ! videorate ! ffmpegcolorspace ! ffdeinterlace ! x264enc ! flvmux name="mux" ! filesink location=vid.flv vtee. ! queue ! xvimagesink
Now it will only work if I do this with a bunch of queue's added one after another before the xvimagesink. Although this does work I get a 2 second delay before the pipeline starts to work and i also get the message :
gst-launch v4l2src ! tee name="vtee" ! queue ! videorate ! ffmpegcolorspace ! ffdeinterlace ! x264enc ! flvmux name="mux" ! filesink location=vid.flv vtee. ! queue ! queue ! queue ! queue ! queue ! xvimagesink
Although the second pipeline above works, there is a pause before the pipeline starts running and I get the message (I don't think this system is 2 slow, its a core i7 with tons of ram):
Additional debug info:
gstbasesink.c(2692): gst_base_sink_is_too_late (): /GstPipeline:pipeline0/GstXvImageSink:xvimagesink0:
There may be a timestamping problem, or this computer is too slow.
Can any one explain what is happening here? What am I doing wrong?