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Re: [Opensvcdecoder-support] Problem decoding IDR pictures
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From: mblestel <med...@in...> - 2010-06-16 07:15:44
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Hello Selim,<br>
<br>
I know that I have problems with MGS case, but it depends of the
encoding parameters.<br>
For example, the decoder is compatible with the following stream
(SVCBMT-13.264) which is part from the conformance testing of the SVC
standard.<br>
This stream has three layers, DqId equals to 0, 1 or 2.<br>
<br>
I have also several others streams with different configurations in
which MGS layers have dependency_id different from 0. And the decoder
is able to decode correctly these streams.<br>
<br>
If you can provide me streams and configuration files for the case
where OpenSVCDecoder is not compatible with.<br>
<br>
Kind regards<br>
<br>
Médéric<br>
<br>
<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 style="color: rgb(31, 73, 125);">Hello
again,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US">Reporting on MGS case:
I have tested some scenarios and I noticed that MGS is fine only with
one layer
on top of the base layer, i.e L0Q0 – L0Q1 works. I have also test
L0Q0-L0Q1-L1Q0
and it works fine. However these cases are not supported by the OpenSVC
Decoder:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent: -18pt;"><!--[if !supportLists]--><span
style="color: rgb(31, 73, 125);" lang="EN-US"><span style="">1.<span
style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span><!--[endif]--><span dir="ltr"></span><span
style="color: rgb(31, 73, 125);" lang="EN-US">More than one MGS Layer
on top of the base layer<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent: -18pt;"><!--[if !supportLists]--><span
style="color: rgb(31, 73, 125);" lang="EN-US"><span style="">2.<span
style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span><!--[endif]--><span dir="ltr"></span><span
style="color: rgb(31, 73, 125);" lang="EN-US">Any MGS layer with L
>
0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US">That means the only
case it works Q=1 and L=0. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US">I hope this could
help any future work on this issue.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US">Selim <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"
lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;"
lang="EN-US">De :</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;"
lang="EN-US">
mblestel [<a class="moz-txt-link-freetext" href="mailto:med...@in...">mailto:med...@in...</a>] <br>
<b>Envoyé :</b> vendredi 11 juin 2010 17:34<br>
<b>À :</b> ELLOUZE Selim RD-CO</span><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">RE-LAN<br>
<b>Cc :</b> <a class="moz-txt-link-abbreviated" href="mailto:ope...@li...">ope...@li...</a>;
<a class="moz-txt-link-abbreviated" href="mailto:mr...@in...">mr...@in...</a><br>
<b>Objet :</b> Re: Problem decoding IDR pictures<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><br>
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>
MGSVector0 4<br>
MGSVector1 4<br>
MGSVector2 8<br>
<br>
<br>
Kind regards<br>
<br>
Médéric<br>
<br>
<a moz-do-not-send="true"
href="mailto:sel...@or...">sel...@or...</a>
a écrit : <o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Hello,</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></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.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></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):</span><o:p></o:p></p>
<p class="MsoNormal"><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</span><o:p></o:p></p>
<p class="MsoNormal"><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</span><o:p></o:p></p>
<p class="MsoNormal"><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</span><o:p></o:p></p>
<p class="MsoNormal"><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</span><o:p></o:p></p>
<p class="MsoNormal"><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</span><o:p></o:p></p>
<p class="MsoNormal"><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</span><o:p></o:p></p>
<p class="MsoNormal"><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</span><o:p></o:p></p>
<p class="MsoNormal"><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</span><o:p></o:p></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</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New";"> </span><o:p></o:p></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.</span><o:p></o:p></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. </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New";" lang="EN-US"> </span><o:p></o:p></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.</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New";" lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New";" lang="EN-US">Best
regards,</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Courier New";" lang="EN-US">Selim
</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom: 12pt;"><span
style="font-size: 12pt; font-family: "Times New Roman","serif";"><o:p> </o:p></span></p>
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Image</span></b><span
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AVENUE DES BUTTES DE COESMES</span></b><o:p></o:p></p>
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708 RENNES CEDEX 7</span></b><span
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<p class="MsoNormal" style="margin: 3.75pt; line-height: 9.75pt;"><b><span
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DE RENNES<o:p></o:p></span></b></p>
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