[gst-devel] no caps set on stream - how to set them?

[Dave Johnston]

Hi,

I'm have a few problems constructing a pipeline with gst-launch.

I initially created a pipeline that read from a custom src element (it reads data from a database) and then decoded and encoded the data before muxing it and writing to a file i.e.

gst-launch -evvv mycustomsrc ! jpegparse ! ffdec_mjpeg ! videorate ! ffenc_mjpeg ! ffmux_mp4 ! filesink location=/tmp/video_test.mp4

This pipeline works, MJPEG video is read from a database, parsed, decoded, re-encoded, muxed and written to a file.  I can then playback video_test.mp4 using VLC.


My problem is when I try to modify the pipeline to scale the video i.e. add the videoscale element.

gst-launch -evvv mycustomsrc ! jpegparse ! ffdec_mjpeg ! videorate ! videoscale ! video/x-raw-yuv,width=320,height=240,framerate=5/1 ! ffenc_mjpeg ! ffmux_mp4 ! filesink location=/tmp/video_test.mp4

This piepline fails, I get the error:
0:00:00.057424331 30345  0x81a5a90 WARN                 basesrc gstbasesrc.c:2378:gst_base_src_loop:<mycustomsrc0> error: Internal data flow error.
0:00:00.057442875 30345  0x81a5a90 WARN                 basesrc gstbasesrc.c:2378:gst_base_src_loop:<mycustomsrc0> error: streaming task paused, reason not-negotiated (-4)
0:00:00.057499751 30345  0x81a5a90 WARN                  ffmpeg gstffmpegmux.c:467:gst_ffmpegmux_collected:<ffmux_mp40> error: no caps set on stream 0 (video)


ffmux_mp4 seems to indicate that no caps set on stream 0(video).  How can I explicitly set caps for this ?

Any ideas are appreciated, thanks.


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