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Re: [Opensvcdecoder-support] Problem decoding IDR pictures
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From: mblestel <med...@in...> - 2010-06-11 16:09:42
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Hello Selim,<br>
<br>
First, thank you for using Open SVC Decoder.<br>
<br>
The problem was due to negative POC, which are authorized in the SVC
standard.<br>
The modifications can be found under the revision 171 of the SVN
repository.<br>
<br>
Concerning constraints in configuration files, Open SVC Decoder is not
compatible with MGSVector.<br>
These following lines should be removed from configuration files:<br>
MGSVectorMode 1<br>
<span class="moz-txt-citetags"></span>MGSVector0 4<br>
<span class="moz-txt-citetags"></span>MGSVector1 4<br>
<span class="moz-txt-citetags"></span>MGSVector2 8<br>
<br>
<br>
Kind regards<br>
<br>
Médéric<br>
<br>
<a class="moz-txt-link-abbreviated" href="mailto:sel...@or...">sel...@or...</a> a écrit :
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<p class="MsoNormal"><span lang="EN-US">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I have got some troubles
trying decoding a
sequence with IDR pictures. The SVC stream is decoded properly except
that when
decoding an IDR picture, a sort of comeback occurs. It is like the
stream is
paused, played back and then restarts being decoded properly. However
changing
the spatial resolution is not affected.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">When I checked the JSVM
encoder output, I
found this stream structure (which I think is the source of the
problem):<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
style="font-size: 10pt; font-family: "Courier New";">AU 0: I T0
L0 Q0 QP 34 Y 31.2299 U 41.3298 V
42.2093 13568 bit<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
style="font-size: 10pt; font-family: "Courier New";">AU 0: I T0
L1 Q0 QP 34 Y 31.1768 U 41.8522 V
42.5728 55392 bit<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
style="font-size: 10pt; font-family: "Courier New";">AU -8: P T1
L0
Q0 QP 38 Y 30.3367 U 41.6256 V
42.7728 5664 bit<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
style="font-size: 10pt; font-family: "Courier New";">AU -8: P T1
L1
Q0 QP 38 Y 30.2618 U 42.3020 V
42.4606 34912 bit<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
style="font-size: 10pt; font-family: "Courier New";">AU -12: P T2
L0
Q0 QP 39 Y 30.0292 U 41.6095 V
42.7954 3280 bit<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
style="font-size: 10pt; font-family: "Courier New";">AU -12: P T2
L1
Q0 QP 39 Y 29.9022 U 42.2241 V 42.2924 27568
bit<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
style="font-size: 10pt; font-family: "Courier New";">AU -14: P T3
L0
Q0 QP 40 Y 29.7667 U 41.6960 V
42.9154 1440 bit<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
style="font-size: 10pt; font-family: "Courier New";">AU -14: P T3
L1
Q0 QP 40 Y 29.2568 U 42.2922 V
42.3649 13952 bit<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New";">AU
-15: P T4 L0 Q0 QP 42 Y 29.6208
U 41.6600 V 42.9284 728 bit<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New";"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New";" lang="EN-US">I
suspect the « - » ordered pictures to trouble the decoder.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New";" lang="EN-US">Please
find attached the configuration files I used and the encoder output. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New";" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New";" lang="EN-US">I
tested you video_2 sequence and I noticed that we could change spatial
resolution without problems so it should include IDR pictures. I was
wondering
if there are any constraints to include in the JSVM configuration files
in
order to have the stream work properly with Open SVC Decoder.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New";" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New";" lang="EN-US">Best
regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New";" lang="EN-US">Selim
</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
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<br>
<div class="moz-signature">-- <br>
<title></title>
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<p class="MsoNormal" style="margin: 3.75pt; line-height: 9.75pt;"><b><span
style="font-size: 8pt; font-family: Verdana; color: rgb(127, 127, 130);">Médéric
Blestel<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin: 3.75pt; line-height: 9.75pt;"><b><span
style="font-size: 8pt; font-family: Verdana; color: rgb(127, 127, 130);">Ingénieur
de Recherche / Research Engineer</span></b><span
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style="">
<br style="">
<o:p></o:p></span></p>
<p class="MsoNormal" style="margin: 3.75pt; line-height: 9.75pt;"><b><span
style="font-size: 8pt; font-family: Verdana; color: rgb(127, 127, 130);">IETR/Groupe
Image</span></b><span
style="font-size: 8pt; font-family: Verdana; color: rgb(127, 127, 130);"> <br
style="">
<br style="">
<b><o:p></o:p></b></span></p>
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align="right"><b><span
style="font-size: 8pt; font-family: Verdana; color: rgb(127, 127, 130);">INSA
DE RENNES<o:p></o:p></span></b></p>
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70 839<o:p></o:p></span></b></p>
<p class="MsoNormal"
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Tél : +33 (2) 23 23 85 67<o:p></o:p></span></p>
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