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<p class=MsoNormal><span style='color:#1F497D'>Update:<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'>The queue problem was
that it connected to the audio output, I fixed it by running:<br>
<br>
gst-launch-1.0 decklinksrc name=d mode=9 connection=1 d. ! queue ! fakesink
d. ! queue ! videoconvert ! autovideosink<br>
<br>
unfortunately the problem still persists – I get the playback at 1-2 frames per
second.<br>
<br>
<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal style='margin-left:35.4pt'><b><span lang=EN-US
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> gstreamer-devel
[mailto:gstreamer-devel-bounces@lists.freedesktop.org] <b>On Behalf Of </b>Krzysztof
Borowczyk<br>
<b>Sent:</b> Wednesday, March 26, 2014 10:44 AM<br>
<b>To:</b> 'Discussion of the development of and with GStreamer'<br>
<b>Subject:</b> RE: decklink plugin<o:p></o:p></span></p>
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<p class=MsoNormal style='margin-left:35.4pt'><o:p> </o:p></p>
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<p class=MsoNormal style='margin-left:35.4pt'><span style='color:#1F497D'>[...]</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
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<p class=MsoNormal style='margin-left:70.8pt'><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
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<div>
<p class=MsoNormal style='margin-left:70.8pt'><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'>Try turning on debug for the
decklinksrc:<o:p></o:p></span></p>
</div>
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<p class=MsoNormal style='margin-left:70.8pt'><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
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<p class=MsoNormal style='margin-left:70.8pt'><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'> GST_DEBUG=decklinksrc:6
gst-launch-1.0 ...<o:p></o:p></span></p>
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<p class=MsoNormal style='margin-left:70.8pt'><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
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<p class=MsoNormal style='margin-left:70.8pt'><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'>That will tell you if it is having to drop
frames because the pipeline<o:p></o:p></span></p>
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<p class=MsoNormal style='margin-left:70.8pt'><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'>isn't receiving them fast enough. If
that's the case try adding a queue<o:p></o:p></span></p>
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<p class=MsoNormal style='margin-left:70.8pt'><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'>after decklinksrc (?).<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:35.4pt'><span style='color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-US>I tried with
these logs, and decklink doesn’t say anything about dropping frames – quite the
opposite, it reports Valid Frame (log.txt):<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-US
style='color:#1F497D'><br>
:00:02.684938080 2552 0x8163120
DEBUG
decklinksrc capture.cpp:114:VideoInputFrameArrived:<decklinksrc0> Frame
received [No timecode] - Valid Frame - Size: 4147200 bytes<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-US
style='color:#1F497D'>0:00:02.688372967 2552 0x815dbb0
DEBUG
decklinksrc gstdecklinksrc.cpp:746:gst_decklink_src_task:<decklinksrc0>
task<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-US
style='color:#1F497D'>0:00:02.718353360 2552 0x8163120
DEBUG
decklinksrc capture.cpp:114:VideoInputFrameArrived:<decklinksrc0> Frame
received [No timecode] - Valid Frame - Size: 4147200 bytes<o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:
12.0pt;margin-left:35.4pt'><span lang=EN-US style='color:#1F497D'>0:00:02.721746566
2552 0x815dbb0
DEBUG
decklinksrc gstdecklinksrc.cpp:746:gst_decklink_src_task:<decklinksrc0>
task<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-US>although, I’m
not sure if the “No timecode” is expected here? Maybe that’s the reason for
drops?<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-US
style='color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal style='margin-left:70.8pt'><span lang=EN-US
style='font-size:12.0pt;font-family:"Times New Roman","serif"'>You could also
try "autovideosink sync=false" and see what happens (you<o:p></o:p></span></p>
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<div>
<p class=MsoNormal style='margin-left:70.8pt'><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'>probably don't want to do that in
practice, but trying it might give some<o:p></o:p></span></p>
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<div>
<p class=MsoNormal style='margin-left:70.8pt'><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'>insight as to what's causing your low
framerate).<o:p></o:p></span></p>
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</div>
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<p class=MsoNormal style='margin-left:35.4pt'><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-US>Setting the sync
to false helps. The playback is not 100% smooth, but it’s much better.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-US
style='color:#1F497D'><o:p> </o:p></span></p>
</div>
<div>
<p class=MsoNormal style='margin-left:70.8pt'><span lang=EN-US
style='font-size:12.0pt;font-family:"Times New Roman","serif"'>Maybe also try
with fakesink, to eliminate videoconvert and your video<o:p></o:p></span></p>
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<div>
<p class=MsoNormal style='margin-left:70.8pt'><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'>sink from the equation: gst-launch-1.0
decklinksrc mode=... ! fakesink<o:p></o:p></span></p>
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<p class=MsoNormal style='margin-left:35.4pt'><span style='font-size:12.0pt;
font-family:"Times New Roman","serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-US>This also seems
to help, there are no messages about dropped buffers.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-US>I don’t know if
the queue solution would help, because GStreamer does not want to connect it
(log2.txt):<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-US>WARNING:
erroneous pipeline: could not link queue0 to videoconvert0<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-US>Any idea why it
would do so?<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-US>-- <o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:35.4pt'><span lang=EN-US>Best regards,<br>
Krzysztof Borowczyk<o:p></o:p></span></p>
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