Re: [Opensvcdecoder-support] SVC standalone display timing

[Mickaël R. <Mic...@in...>]

A raw stream does not contain timing information. For any timing information, you need a container mp4, mp2ts, Mkv. That's why you going as fast as possible.

Mickael

Sent by my iPhone

Le 19 sept. 2011 à 19:29, alberto alvarez gonzález<alb...@ho...> a écrit :

> Hello
> 
> I'm opening a new thread with more questions. Your help has been invaluable so far.
> 
> Regarding the display timing, yesterday's svn showed the video as fast as it was processed. 
> I have come across a quick workaround which pretty much works for me. It is based on SDL_Delay function which forces the display
> to wait 1/FPS. Given the dynamic fps nature of SVC I have thought using NAL indexes MaxTemporalId and TempToDisplay to compute 
> the fraction of original fps (the max) that is used (linked to -tempId input). Roughly:
>           
>          fps_start_time=SDL_GetTicks();
> 
>           SDL_Display(16, XDIM, YDIM, Y, U, V);
> 
>          current_fps=FPS>>(DqIdNextNal_Nal_o->MaxTemporalId-DqIdNextNal_Nal_o->TempToDisplay);
>          SDL_Delay((unsigned int)1000.0/current_fps-(SDL_GetTicks()-fps_start_time));
> 
> However, I experienced two issues. 
> 1- Can't find FPS of the sequence in any header of raw sequences ¿is it there yet? For now is an input parameter.
> 2- With a fps reduction factor of 2 I should expect half the frames. However, it shows ¿repeated? all the frames
> Depending on decoder_svc_VideoParameter_ImgToDisplay value ([1,2]) there are two paths possible and in my example, the
> frames are displayed from those code sequences alternatively. I think the frames are repeated.
> 
> What are the implications of that parameter? Am I getting it right?
> 
> Any help would be appreciated. 
> 
> Best Regards,
> 
> Alberto Alvarez
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