gst-launch, decodebin and avimux - stalled pipeline, what am I doing wrong ?

[Tim Day-2]

I've been playing around getting a feel for what gstreamer can do using
gst-launch. I don't have any problems if I just want to process audio or
video separately (to separate files, or to alsasink/ximagesink), but I'm
confused by what I need to do to mux the streams back together using,
say avimux.

This

  gst-launch-0.10 filesrc location=MVI_2034.AVI ! decodebin name=dec \
  dec. ! queue ! audioconvert ! 'audio/x-raw-int,rate=44100,channels=1' ! queue ! mux. \
  dec. ! queue ! videoflip 1 ! ffmpegcolorspace ! jpegenc ! queue ! mux. \
  avimux name=mux ! filesink location=out.avi

just outputs

  Setting pipeline to PAUSED ...
  Pipeline is PREROLLING ...

and then stalls indefinitely.  Variations I've tried with less 'queues',
(which I'm a little unclear on the need for) do the same.

What's the trick ?
Thanks for any help
Tim (gstreamer newbie, on Debian/Squeeze)



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[Sudarshan Bisht]

Hi ,

Set properties for jpegenc (mimetype,  image width and height, blocksize , foarmat , framerate  etc ).

On Tue, Jun 15, 2010 at 3:48 PM, Tim Day <[hidden email]> wrote:

I've been playing around getting a feel for what gstreamer can do using
gst-launch. I don't have any problems if I just want to process audio or
video separately (to separate files, or to alsasink/ximagesink), but I'm
confused by what I need to do to mux the streams back together using,
say avimux.

This

 gst-launch-0.10 filesrc location=MVI_2034.AVI ! decodebin name=dec \
 dec. ! queue ! audioconvert ! 'audio/x-raw-int,rate=44100,channels=1' ! queue ! mux. \
 dec. ! queue ! videoflip 1 ! ffmpegcolorspace ! jpegenc ! queue ! mux. \
 avimux name=mux ! filesink location=out.avi

just outputs

 Setting pipeline to PAUSED ...
 Pipeline is PREROLLING ...

and then stalls indefinitely.  Variations I've tried with less 'queues',
(which I'm a little unclear on the need for) do the same.

What's the trick ?
Thanks for any help
Tim (gstreamer newbie, on Debian/Squeeze)



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--
Regards,

Sudarshan Bisht

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[Tim Day-2]

On Tue, 2010-06-15 at 16:24 +0300, sudarshan bisht wrote:
> Set properties for jpegenc (mimetype,  image width and height,
> blocksize , foarmat , framerate  etc ).

I've taken jpegenc out of the picture.  Here's a better statement of the
problem:

This works as expected:
  gst-launch-0.10 \
  videotestsrc ! ffmpegcolorspace ! 'video/x-raw-yuv' ! mux. \
  audiotestsrc ! audioconvert !
'audio/x-raw-int,rate=44100,channels=1' ! mux. \
  avimux name=mux ! filesink location=gst.avi
...let it run for a while, kill it, and totem gst.avi gives you a nice
test card with tone.

This doesn't:
  gst-launch-0.10 \
  filesrc location=MVI_2034.AVI ! decodebin name=dec \
  dec. ! ffmpegcolorspace ! 'video/x-raw-yuv' ! mux. \
  dec. ! audioconvert ! 'audio/x-raw-int,rate=44100,channels=1' ! mux. \
  avimux name=mux ! filesink location=gst.avi
...does the endless "Pipeline is PREROLLING ..."

On the face of it, avimux is getting the same thing flung at it in
either case.  Running gst-launch with -vm all looks sensible sizes,
framerate etc.  Which suggests the problem is more to do with decodebin.

Any ideas how to get the latter case above rolling ?

Tim



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[Tim Day-2]

On Tue, 2010-06-15 at 22:00 +0100, Tim Day wrote:
>   gst-launch-0.10 \
>   filesrc location=MVI_2034.AVI ! decodebin name=dec \
>   dec. ! ffmpegcolorspace ! 'video/x-raw-yuv' ! mux. \
>   dec. ! audioconvert ! 'audio/x-raw-int,rate=44100,channels=1' ! mux. \
>   avimux name=mux ! filesink location=gst.avi
> ...does the endless "Pipeline is PREROLLING ..."

OK cracked it... this does what I want:

gst-launch-0.10 \
filesrc location=MVI_2034.AVI ! decodebin name=dec \
dec. ! queue ! ffmpegcolorspace ! 'video/x-raw-yuv' ! queue ! mux. \
dec. ! queue ! audioconvert ! 'audio/x-raw-int,channels=1' ! audioresample ! 'audio/x-raw-int,rate=44100' ! queue ! mux. \
avimux name=mux ! filesink location=gst.avi

The queue elements (both leading and trailing) appear to be crucial.

Further experiments adding things like videoflip or
  videorate !'video/x-raw-yuv,framerate=25/1'
into the video part of the pipeline all work as expected.

Tim



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