Comments on: Mode-Dependent Directional Transform (MDDT) in JM/KTA http://www.h265.net/2009/09/mode-dependent-directional-transform-mddt-in-jmkta.html Witness the development of H.265 Sun, 05 Feb 2012 01:21:15 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Rebecca http://www.h265.net/2009/09/mode-dependent-directional-transform-mddt-in-jmkta.html/comment-page-1#comment-2599 Rebecca Tue, 30 Nov 2010 02:47:23 +0000 http://www.h265.net/?p=255#comment-2599 Hi,I wonder how to make decision between 8x8DCT and 4X4DCT for inter prediction MB without sub-partition less than 8x8 in H.264/AVC. Could you please give me some hints? In fact ,I cann't understand why JM just computs SATD8x8 and SADT4x4 respectively for a 8x8block and then get the best transform mode. PS: the function is int GetBestTransformP8x8(Macroblock *currMB) .Thanks very much! Hi,I wonder how to make decision between 8x8DCT and 4X4DCT for inter prediction MB without sub-partition less than 8×8 in H.264/AVC. Could you please give me some hints? In fact ,I cann’t understand why JM just computs SATD8x8 and SADT4x4 respectively for a 8x8block and then get the best transform mode.
PS: the function is int GetBestTransformP8x8(Macroblock *currMB) .Thanks very much!

]]> By: Jie Dong http://www.h265.net/2009/09/mode-dependent-directional-transform-mddt-in-jmkta.html/comment-page-1#comment-2534 Jie Dong Wed, 08 Sep 2010 08:36:22 +0000 http://www.h265.net/?p=255#comment-2534 No. No.

]]> By: Edward http://www.h265.net/2009/09/mode-dependent-directional-transform-mddt-in-jmkta.html/comment-page-1#comment-2533 Edward Wed, 08 Sep 2010 07:54:05 +0000 http://www.h265.net/?p=255#comment-2533 I wonder is there any "directional" transforms such as Contourlet and Wavelet-based Contourlet used in the latest development of H.264/AVC or H.265 reference softwares? Thank you very much! I wonder is there any “directional” transforms such as Contourlet and Wavelet-based Contourlet used in the latest development of H.264/AVC or H.265 reference softwares?

Thank you very much!

]]> By: hohai http://www.h265.net/2009/09/mode-dependent-directional-transform-mddt-in-jmkta.html/comment-page-1#comment-2474 hohai Wed, 21 Apr 2010 01:03:03 +0000 http://www.h265.net/?p=255#comment-2474 please,can you tell me how can we get basis images of MDDT .I have see the mddct i have found that there is something different .I want to know the principle of the algorithm. please,can you tell me how can we get basis images of MDDT .I have see the mddct i have found that there is something different .I want to know the principle of the algorithm.

]]> By: Yu Liu http://www.h265.net/2009/09/mode-dependent-directional-transform-mddt-in-jmkta.html/comment-page-1#comment-2432 Yu Liu Tue, 03 Nov 2009 13:34:08 +0000 http://www.h265.net/?p=255#comment-2432 Yes, if you just want to evaluate the subjective quality of reconstructed video, you have to use the KTA decoder to parse the KTA bitstream. Yes, if you just want to evaluate the subjective quality of reconstructed video, you have to use the KTA decoder to parse the KTA bitstream.

]]> By: Zhou Jin http://www.h265.net/2009/09/mode-dependent-directional-transform-mddt-in-jmkta.html/comment-page-1#comment-2431 Zhou Jin Tue, 03 Nov 2009 13:30:48 +0000 http://www.h265.net/?p=255#comment-2431 >>The KTA software includes a lot of additional coding tools that are not compatible with H.264 syntax, so >>you can’t use H.264 video player to view the KTA bitstream. Thank you. So basically if I want to evaluate the stream then have to do it after decoding? >>The KTA software includes a lot of additional coding tools that are not compatible with H.264 syntax, so >>you can’t use H.264 video player to view the KTA bitstream.
Thank you. So basically if I want to evaluate the stream then have to do it after decoding?

]]> By: Yu Liu http://www.h265.net/2009/09/mode-dependent-directional-transform-mddt-in-jmkta.html/comment-page-1#comment-2430 Yu Liu Tue, 03 Nov 2009 13:25:11 +0000 http://www.h265.net/?p=255#comment-2430 The KTA software includes a lot of additional coding tools that are not compatible with H.264 syntax, so you can't use H.264 video player to view the KTA bitstream. If you want the KTA software to produce a H.264 compatible bitstream, you should disable the KTA MACRO definitions in the "defines.h", i.e., "ADAPTIVE_FILTER" to "SIMPLIFIED_RDPIC_DECISION". The KTA software includes a lot of additional coding tools that are not compatible with H.264 syntax, so you can’t use H.264 video player to view the KTA bitstream. If you want the KTA software to produce a H.264 compatible bitstream, you should disable the KTA MACRO definitions in the “defines.h”, i.e., “ADAPTIVE_FILTER” to “SIMPLIFIED_RDPIC_DECISION”.

]]> By: Zhou Jin http://www.h265.net/2009/09/mode-dependent-directional-transform-mddt-in-jmkta.html/comment-page-1#comment-2429 Zhou Jin Tue, 03 Nov 2009 06:54:50 +0000 http://www.h265.net/?p=255#comment-2429 Please, Did anyone ever tested the KTA software and tried to view the .264 file it produced? I mean, I tried several versions but none of them produced a .264 file that can be viewed by players such like StreamEYE. Or did it need some specific players or something? Please, Did anyone ever tested the KTA software and tried to view the .264 file it produced? I mean, I tried several versions but none of them produced a .264 file that can be viewed by players such like StreamEYE. Or did it need some specific players or something?

]]> By: Yu Liu http://www.h265.net/2009/09/mode-dependent-directional-transform-mddt-in-jmkta.html/comment-page-1#comment-2408 Yu Liu Wed, 07 Oct 2009 03:36:35 +0000 http://www.h265.net/?p=255#comment-2408 The sequences for VCEG common test conditions are available at ftp://vceg-seq.ateme.net/reference/, but the ftp server is a password protected site. You are advised to contact the Rapporteur (Gary Sullivan from Microsoft? I guess) to get the password according to VCEG-AJ10r1. The sequences for VCEG common test conditions are available at ftp://vceg-seq.ateme.net/reference/, but the ftp server is a password protected site. You are advised to contact the Rapporteur (Gary Sullivan from Microsoft? I guess) to get the password according to VCEG-AJ10r1.

]]> By: Fatih http://www.h265.net/2009/09/mode-dependent-directional-transform-mddt-in-jmkta.html/comment-page-1#comment-2407 Fatih Tue, 06 Oct 2009 20:22:20 +0000 http://www.h265.net/?p=255#comment-2407 Can anyone tell me where I can download the HD test sequences used here such as BigShips City Crew Night ShuttleStart etc.. ? Can anyone tell me where I can download the HD test sequences used here such as BigShips City Crew Night ShuttleStart etc.. ?

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