constant framerate
Matt Pekar
mpekar at raineyelectronics.com
Mon Jul 30 06:07:38 PDT 2012
I just discovered gstdebugutils, which has a great function for dumping out
a graph of the entire pipeline. I call it and have it output to chrome
directly:
void display_pipeline_in_chrome() {
const char* temp_filename = "gst_bin_graph_tmp";
char dot_command[1024];
char chrome_command[1024];
const char* DIR = getenv("GST_DEBUG_DUMP_DOT_DIR");
GstDebugGraphDetails output_flags =
GstDebugGraphDetails(GST_DEBUG_GRAPH_SHOW_MEDIA_TYPE |
GST_DEBUG_GRAPH_SHOW_STATES | GST_DEBUG_GRAPH_SHOW_NON_DEFAULT_PARAMS);
GST_DEBUG_BIN_TO_DOT_FILE(GST_BIN(PIPELINE), output_flags, temp_filename);
snprintf(dot_command, sizeof(dot_command), "dot -Tpng %s/%s.dot -o
%s/%s.png", DIR, temp_filename, DIR, temp_filename);
snprintf(chrome_command, sizeof(chrome_command), "google-chrome %s/%s.png",
DIR, temp_filename);
system(dot_command);
system(chrome_command);
}
The mode of the pads will be marked with one of "-><" to represent none,
push, or pull.
On Sat, Jul 28, 2012 at 2:14 PM, Demeyer Jonathan
<Jonathan.Demeyer at macq.eu>wrote:
> 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> 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:
>> gstreamer-devel-bounces+jonathan.demeyer=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> 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*
>>>
>>>
>>> _______________________________________________
>>> gstreamer-devel mailing list
>>> gstreamer-devel at lists.freedesktop.org
>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>
>>>
>>
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>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
>>
>
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