constant framerate

Sat Jul 28 12:14:07 PDT 2012

It works !

Thanks a lot.

However, it leaves me with a misunderstanding.
Is this pipeline pull-based ?
I thought that normal pipelines were push-based.
How can we know (even after launch).

Jonathan

________________________________
De : gstreamer-devel-bounces+jonathan.demeyer=macq.eu at lists.freedesktop.org [gstreamer-devel-bounces+jonathan.demeyer=macq.eu at lists.freedesktop.org] de la part de Matt Pekar [mpekar at raineyelectronics.com]
Date d'envoi : vendredi 27 juillet 2012 18:09
À : Discussion of the development of and with GStreamer
Objet : Re: constant framerate

Try adding sync=true to the fakesink element:

gst-launch -v videotestsrc num-buffers=10 ! videorate force-fps="1/1" ! "video/x-raw-yuv,framerate=1/1" ! fakesink sync=true

On Fri, Jul 27, 2012 at 11:04 AM, Demeyer Jonathan <Jonathan.Demeyer at macq.eu<mailto:Jonathan.Demeyer at macq.eu>> wrote:
Tanks Matt for the reply.

This didn't work for me as you can see :

$ date; gst-launch -v videotestsrc num-buffers=10 ! videorate force-fps="1/1" ! "video/x-raw-yuv,framerate=1/1" ! fakesink; date
Fri Jul 27 17:55:42 CEST 2012
Setting pipeline to PAUSED ...
/GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0.GstPad:src: caps = video/x-raw-yuv, framerate=(fraction)1/1, format=(fourcc)YUY2, color-matrix=(string)sdtv, chroma-site=(string)mpeg2, width=(int)320, height=(int)240
Pipeline is PREROLLING ...
/GstPipeline:pipeline0/GstVideoRate:videorate0.GstPad:src: caps = video/x-raw-yuv, framerate=(fraction)1/1, format=(fourcc)YUY2, color-matrix=(string)sdtv, chroma-site=(string)mpeg2, width=(int)320, height=(int)240
/GstPipeline:pipeline0/GstVideoRate:videorate0.GstPad:sink: caps = video/x-raw-yuv, framerate=(fraction)1/1, format=(fourcc)YUY2, color-matrix=(string)sdtv, chroma-site=(string)mpeg2, width=(int)320, height=(int)240
/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:src: caps = video/x-raw-yuv, framerate=(fraction)1/1, format=(fourcc)YUY2, color-matrix=(string)sdtv, chroma-site=(string)mpeg2, width=(int)320, height=(int)240
/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:sink: caps = video/x-raw-yuv, framerate=(fraction)1/1, format=(fourcc)YUY2, color-matrix=(string)sdtv, chroma-site=(string)mpeg2, width=(int)320, height=(int)240
/GstPipeline:pipeline0/GstFakeSink:fakesink0.GstPad:sink: caps = video/x-raw-yuv, framerate=(fraction)1/1, format=(fourcc)YUY2, color-matrix=(string)sdtv, chroma-site=(string)mpeg2, width=(int)320, height=(int)240
/GstPipeline:pipeline0/GstFakeSink:fakesink0: last-message = "preroll   ******* "
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
/GstPipeline:pipeline0/GstFakeSink:fakesink0: last-message = "event   ******* (fakesink0:sink) E (type: 102, GstEventNewsegment, update=(boolean)false, rate=(double)1, applied-rate=(double)1, format=(GstFormat)GST_FORMAT_TIME, start=(gint64)0, stop=(gint64)-1, position=(gint64)0;) 0x9173750"
New clock: GstSystemClock
/GstPipeline:pipeline0/GstFakeSink:fakesink0: last-message = "chain   ******* (fakesink0:sink) (153600 bytes, timestamp: 0:00:00.000000000, duration: 0:00:01.000000000, offset: 0, offset_end: 1, flags: 33 ro discont ) 0x9180760"
/GstPipeline:pipeline0/GstFakeSink:fakesink0: last-message = "chain   ******* (fakesink0:sink) (153600 bytes, timestamp: 0:00:01.000000000, duration: 0:00:01.000000000, offset: 1, offset_end: 2, flags: 1 ro ) 0xb6c01870"
/GstPipeline:pipeline0/GstFakeSink:fakesink0: last-message = "chain   ******* (fakesink0:sink) (153600 bytes, timestamp: 0:00:02.000000000, duration: 0:00:01.000000000, offset: 2, offset_end: 3, flags: 1 ro ) 0xb6c01930"
/GstPipeline:pipeline0/GstFakeSink:fakesink0: last-message = "chain   ******* (fakesink0:sink) (153600 bytes, timestamp: 0:00:03.000000000, duration: 0:00:01.000000000, offset: 3, offset_end: 4, flags: 1 ro ) 0xb6c019f0"
/GstPipeline:pipeline0/GstFakeSink:fakesink0: last-message = "chain   ******* (fakesink0:sink) (153600 bytes, timestamp: 0:00:04.000000000, duration: 0:00:01.000000000, offset: 4, offset_end: 5, flags: 1 ro ) 0xb6c01ab0"
/GstPipeline:pipeline0/GstFakeSink:fakesink0: last-message = "chain   ******* (fakesink0:sink) (153600 bytes, timestamp: 0:00:05.000000000, duration: 0:00:01.000000000, offset: 5, offset_end: 6, flags: 1 ro ) 0xb6c01b70"
/GstPipeline:pipeline0/GstFakeSink:fakesink0: last-message = "chain   ******* (fakesink0:sink) (153600 bytes, timestamp: 0:00:06.000000000, duration: 0:00:01.000000000, offset: 6, offset_end: 7, flags: 1 ro ) 0xb6c01c78"
/GstPipeline:pipeline0/GstFakeSink:fakesink0: last-message = "chain   ******* (fakesink0:sink) (153600 bytes, timestamp: 0:00:07.000000000, duration: 0:00:01.000000000, offset: 7, offset_end: 8, flags: 1 ro ) 0xb6c01d38"
/GstPipeline:pipeline0/GstFakeSink:fakesink0: last-message = "chain   ******* (fakesink0:sink) (153600 bytes, timestamp: 0:00:08.000000000, duration: 0:00:01.000000000, offset: 8, offset_end: 9, flags: 1 ro ) 0xb6c01b10"
/GstPipeline:pipeline0/GstFakeSink:fakesink0: last-message = "chain   ******* (fakesink0:sink) (153600 bytes, timestamp: 0:00:09.000000000, duration: 0:00:01.000000000, offset: 9, offset_end: 10, flags: 1 ro ) 0xb6c01b70"
/GstPipeline:pipeline0/GstFakeSink:fakesink0: last-message = "event   ******* (fakesink0:sink) E (type: 86, ) 0x9173750"
Got EOS from element "pipeline0".
Execution ended after 12853781 ns.
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
/GstPipeline:pipeline0/GstFakeSink:fakesink0.GstPad:sink: caps = NULL
/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:src: caps = NULL
/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:sink: caps = NULL
/GstPipeline:pipeline0/GstVideoRate:videorate0.GstPad:src: caps = NULL
/GstPipeline:pipeline0/GstVideoRate:videorate0.GstPad:sink: caps = NULL
/GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0.GstPad:src: caps = NULL
Setting pipeline to NULL ...
Freeing pipeline ...
Fri Jul 27 17:55:42 CEST 2012

While :
$ gst-inspect --gst-version
GStreamer Core Library version 0.10.36

Any idea ?

Thanks,

Jonathan DEMEYER

________________________________
From: gstreamer-devel-bounces+jonathan.demeyer=macq.eu at lists.freedesktop.org<mailto:macq.eu at lists.freedesktop.org> [mailto:gstreamer-devel-bounces+jonathan.demeyer<mailto:gstreamer-devel-bounces%2Bjonathan.demeyer>=macq.eu at lists.freedesktop.org<mailto:macq.eu at lists.freedesktop.org>] On Behalf Of Matt Pekar
Sent: mercredi 25 juillet 2012 15:08
To: Discussion of the development of and with GStreamer
Subject: Re: constant framerate

videorate has a "force-fps" attribute:

videorate force-fps=1

http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-plugins/html/gst-plugins-base-plugins-videorate.html

On Wed, Jul 25, 2012 at 5:00 AM, Demeyer Jonathan <Jonathan.Demeyer at macq.eu<mailto:Jonathan.Demeyer at macq.eu>> wrote:
Hello,

I'm trying to test a pipeline (test performance of an element) and for this I want to have a constant image flow.
I've try the videorate element like this :
gst-launch -v filesrc location="Pictures/image.jpg" ! jpegdec ! imagefreeze ! videorate ! "video/x-raw-yuv,framerate=1/1" ! fakesink

But logs tells me that images come when the system is ready instead of each second (but timestamps are OK). Actually I see no difference between using videorate or not.
Do I need to use another element or is it a flag that i've missing ?

Thanks in advance,

Jonathan DEMEYER

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