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Re: [Opensvcdecoder-support] What is a ghost picture?
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From: Mickaël R. <mic...@in...> - 2011-03-17 23:23:12
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Siyuan, yes it is for tpcmp and it also works for mplayer, but it doesn't matter as you said since it works for you. Mickaël Le 18 mars 2011 à 00:19, Siyuan Xiang a écrit : > Dear Médéric, > > Thank you very much! It works! > I download the latest version and use PC.c instead of H264_plg.c, I do not know how to use H264_plg.c. Is this used for TCPMP? > Anyway, every layer can be decoded. :) > > Regards, > Siyuan Xiang > --- > > > > On Thu, Mar 17, 2011 at 02:19, Médéric Blestel <Med...@in...> wrote: > Dear Siyuan, > > It seems that the stream is correctly decoded with the last version of the decoder. > Can you confirm it? > > I join you the last version of the h264_plg.c file. > > Kind regards, > Médéric > > > Le 14/03/2011 20:51, Siyuan Xiang a écrit : >> I see. Thank you Mickael and Mederic. >> >> I get an access violation when decoding a bitstream, which has 6 layers. >> The configuration is 320x180 (2 quality layers), 640x360 (2 quality layers), 1280x720 (2 quality layers). Each layer has the same frame rate 24. >> >> The lower resolutions can be decoded without problem. But when I set the DqID to 32 or 33, decoding the 1280x720 resolution, I will get access violation at mb4x4_mode [mode](ptr_img, PicWidthInPix, residu -> AvailMask, locx, locy); in file 264_baseline_decoder\lib_baseline\decode_MB_I.c. >> >> It seems that mode is larger than the array size. >> >> I divide the source video into segment of 17 frames and encode them separately, then concatenate them together. The bitstream has 17x5 = 85 frames. >> >> >> >> >> Regards, >> Siyuan >> --- >> >> >> >> On Mon, Mar 14, 2011 at 02:04, Médéric Blestel <Med...@in...> wrote: >> Dear Siyuan, >> >> To clarify the ghost picture discussion. >> *ImageToDisplay is equals to 2 when a temporal layer has been detected in another layer. >> >> This mechanism helps to keep the frame rate between all layers. >> In fact, when temporal scalability is present, each layer has got different number of frames. >> >> For instance, with a 2 temporal layer (and 1 enhancement layer): >> - Base layer: 150 frames at 15 fps >> - Top layer: 300 frames at 30 fps. >> >> Each layer has to be decoded at different frame rate, between the stream duration is the same (10 s). >> Without this mechanism, the base layer would be decoded at 30 fps instead of 15 fps. So to keep the same video duration, >> *ImageToDisplay is set to 2, and a frame is displayed, and will be displayed again with *ImageToDisplay = 1. >> >> Kind regards, >> Médéric >> >> >> Le 14/03/2011 09:26, Mickaël Raulet a écrit : >> >> With a temporal layer with a lower frame rate, we are inserting ghost pictures to give the same framerate of the enhancement layers. >> Mickaël >> >> Le 14 mars 2011 à 09:23, Siyuan Xiang a écrit : >> >> Hi, all, >> >> I downloaded the latest source from svn, now all the frames can be flushed out. >> I tried a 17-picture bitstream, but found 18 pictures are displayed. The second displayed picture is a ghost picture (I checked *ImageToDisplay which is equal to 2). >> What is a ghost picture? Can I just ignore the ghost picture? >> >> By the way, I found the decoding is faster than before :) >> >> Regards, >> Siyuan >> --- >> >> ------------------------------------------------------------------------------ >> Colocation vs. Managed Hosting >> A question and answer guide to determining the best fit >> for your organization - today and in the future. >> http://p.sf.net/sfu/internap-sfd2d_______________________________________________ >> Opensvcdecoder-support mailing list >> Ope...@li... >> https://lists.sourceforge.net/lists/listinfo/opensvcdecoder-support >> >> ------------------------------------------------------------------------------ >> Colocation vs. Managed Hosting >> A question and answer guide to determining the best fit >> for your organization - today and in the future. >> http://p.sf.net/sfu/internap-sfd2d >> _______________________________________________ >> Opensvcdecoder-support mailing list >> Ope...@li... >> https://lists.sourceforge.net/lists/listinfo/opensvcdecoder-support >> >> >> >> ------------------------------------------------------------------------------ >> Colocation vs. Managed Hosting >> A question and answer guide to determining the best fit >> for your organization - today and in the future. >> http://p.sf.net/sfu/internap-sfd2d >> >> _______________________________________________ >> Opensvcdecoder-support mailing list >> Ope...@li... >> https://lists.sourceforge.net/lists/listinfo/opensvcdecoder-support > > > ------------------------------------------------------------------------------ > Colocation vs. Managed Hosting > A question and answer guide to determining the best fit > for your organization - today and in the future. > http://p.sf.net/sfu/internap-sfd2d_______________________________________________ > Opensvcdecoder-support mailing list > Ope...@li... > https://lists.sourceforge.net/lists/listinfo/opensvcdecoder-support |
