Still stuck

[Gary Thomas]

On 2013-03-07 08:39, David Röthlisberger wrote:
> On 7 Mar 2013, at 15:20, Gary Thomas wrote:
>> Sorry if this is an old record, but I'm getting nowhere...
>>
>> Why does this pipeline work:
>>   gst-launch -e -vvv shmsrc socket-path=/tmp/shm-stream.sock \
>>     ! "application/x-rtp, sampling=(string)YCbCr-4:2:2, width=(string)720, height=(string)480, payload=(int)96" \
>>     ! rtpvrawdepay \
>>     ! fakesink
>>
>> and this one does not?
>>   gst-launch -e -vvv shmsrc socket-path=/tmp/shm-stream.sock \
>>     ! "application/x-rtp, sampling=(string)YCbCr-4:2:2, width=(string)720, height=(string)480, payload=(int)96" \
>>     ! rtpvrawdepay \
>>     ! ffenc_mpeg4 \
>>     ! fakesink
>>
>> Note: I only added the mpeg4 encoder element which is compatible
>> and there are no errors/complaints.
>>
>> The elements all have compatible [default] caps and it should
>> just work.  If I trade the 'shmsrc'+'rtpvrawdepay' for something
>> like 'videotestsrc', both can work.
>
>
> First of all I haven't read through your previous emails, so apologies
> for that. What do you mean by "doesn't work"? What are the symptoms?
> What steps have you taken to investigate the problem -- have you enabled
> debug logging, and what has that told you?

In this case "doesn't work" means that when I run the first pipeline,
fakesink prints messages about the data it is consuming/discarding.
In the case of the second pipeline, there are no such messages.

I've tried generating debug dumps at various levels.  What I can see is
that in both cases, the pipeline I specify gets created and it moves to
PLAYING.  In the non-working case, nothing useful seems to happen after
this - shmsrc grabs data and rtpdepay says it is dispatching it (there
are line-by-line messages) but nothing comes out of ffenc_mpeg4.

I wonder if this is a case where ffenc_mpeg4 does not like being fed the
video frame line by line (which is what comes out of the rtpvrawdepay element)?
I tried adding queue with a blocking threshold, but that didn't help either.
   gst-launch -e -vvv shmsrc socket-path=/tmp/shm-stream.sock \
     ! "application/x-rtp, sampling=(string)YCbCr-4:2:2, width=(string)720, height=(string)480, payload=(int)96" \
     ! rtpvrawdepay \
     ! queue min-threshold-bytes=691200 \
     ! ffenc_mpeg4 \
     ! fakesink
Where '691200' is the size of exactly one video frame.

If I run this pipeline, I get this output:
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:src: caps = application/x-rtp, sampling=(string)YCbCr-4:2:2, width=(string)720, height=(string)480, payload=(int)96, 
media=(string)video, clock-rate=(int)90000, encoding-name=(string)RAW
/GstPipeline:pipeline0/GstRtpVRawDepay:rtpvrawdepay0.GstPad:src: caps = video/x-raw-yuv, width=(int)720, height=(int)480, format=(fourcc)UYVY, framerate=(fraction)0/1
/GstPipeline:pipeline0/GstRtpVRawDepay:rtpvrawdepay0.GstPad:sink: caps = application/x-rtp, sampling=(string)YCbCr-4:2:2, width=(string)720, height=(string)480, payload=(int)96, 
media=(string)video, clock-rate=(int)90000, encoding-name=(string)RAW
/GstPipeline:pipeline0/GstQueue:queue0.GstPad:sink: caps = video/x-raw-yuv, width=(int)720, height=(int)480, format=(fourcc)UYVY, framerate=(fraction)0/1
/GstPipeline:pipeline0/GstQueue:queue0.GstPad:src: caps = video/x-raw-yuv, width=(int)720, height=(int)480, format=(fourcc)UYVY, framerate=(fraction)0/1
    ... sits there
^CCaught interrupt -- handling interrupt.
Interrupt: Stopping pipeline ...
Setting pipeline to NULL ...
/GstPipeline:pipeline0/GstQueue:queue0.GstPad:src: caps = NULL
/GstPipeline:pipeline0/GstQueue:queue0.GstPad:sink: caps = NULL
/GstPipeline:pipeline0/GstRtpVRawDepay:rtpvrawdepay0.GstPad:src: caps = NULL
/GstPipeline:pipeline0/GstRtpVRawDepay:rtpvrawdepay0.GstPad:sink: caps = NULL
/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:src: caps = NULL
Freeing pipeline ...

If I remove the ffenc_mpeg4 element, I see this:
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:src: caps = application/x-rtp, sampling=(string)YCbCr-4:2:2, width=(string)720, height=(string)480, payload=(int)96, 
media=(string)video, clock-rate=(int)90000, encoding-name=(string)RAW
/GstPipeline:pipeline0/GstRtpVRawDepay:rtpvrawdepay0.GstPad:src: caps = video/x-raw-yuv, width=(int)720, height=(int)480, format=(fourcc)UYVY, framerate=(fraction)0/1
/GstPipeline:pipeline0/GstRtpVRawDepay:rtpvrawdepay0.GstPad:sink: caps = application/x-rtp, sampling=(string)YCbCr-4:2:2, width=(string)720, height=(string)480, payload=(int)96, 
media=(string)video, clock-rate=(int)90000, encoding-name=(string)RAW
/GstPipeline:pipeline0/GstQueue:queue0.GstPad:sink: caps = video/x-raw-yuv, width=(int)720, height=(int)480, format=(fourcc)UYVY, framerate=(fraction)0/1
/GstPipeline:pipeline0/GstQueue:queue0.GstPad:src: caps = video/x-raw-yuv, width=(int)720, height=(int)480, format=(fourcc)UYVY, framerate=(fraction)0/1
/GstPipeline:pipeline0/GstFakeSink:fakesink0.GstPad:sink: caps = video/x-raw-yuv, width=(int)720, height=(int)480, format=(fourcc)UYVY, framerate=(fraction)0/1
/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;) 0xe4040"
/GstPipeline:pipeline0/GstFakeSink:fakesink0: last-message = "chain   ******* (fakesink0:sink) (691200 bytes, timestamp: none, duration: none, offset: -1, offset_end: -1, flags: 32 
discont ) 0xb5402478"
New clock: GstSystemClock
/GstPipeline:pipeline0/GstFakeSink:fakesink0: last-message = "chain   ******* (fakesink0:sink) (691200 bytes, timestamp: none, duration: none, offset: -1, offset_end: -1, flags: 0 
) 0xb5402548"
/GstPipeline:pipeline0/GstFakeSink:fakesink0: last-message = "chain   ******* (fakesink0:sink) (691200 bytes, timestamp: none, duration: none, offset: -1, offset_end: -1, flags: 0 
) 0xb5402818"
/GstPipeline:pipeline0/GstFakeSink:fakesink0: last-message = "chain   ******* (fakesink0:sink) (691200 bytes, timestamp: none, duration: none, offset: -1, offset_end: -1, flags: 0 
) 0xb54024e0"
    ... until I type ^C

The debug logs for these two examples are at
   http://www.mlbassoc.com/misc/log.fakesink
   http://www.mlbassoc.com/misc/log.fakesink+ffenc

Any ideas?

-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------