Hello Kevin
In general, does the relationship holds good between the frame size and the
decoding time irrespective of the software being used.
Regards
Krishna Prasad
On Fri, Feb 29, 2008 at 3:19 AM, kevin liu <[EMAIL PROTECTED]> wrote:
> libmpeg2? I use ffmpeg2 with mplayer to decode my HDTV ts stream,but
> the effect seems not so good.
> The video and audio may lose synchronization after a period of time.
> And works well for SDTV program.
>
>
> On Fri, Feb 29, 2008 at 3:33 AM, Keith Winstein <[EMAIL PROTECTED]> wrote:
> > Hi Krishna,
> >
> > There's no exact formula -- it's very hard to exactly quantify the
> > performance of a general-purpose computer.
> >
> > In general, the bigger the frame (in resolution), the more work it'll
> take
> > to decode.
> >
> > The bigger the frame (in number of bits used to code it), the longer
> it'll
> > take to decode as well, I think.
> >
> > I think more use of motion compensation probably also slows down
> decoding.
> >
> > My guess would be that, on a PC of recent vintage, libmpeg2 can decode
> any
> > Main Profile @ High Level bitstream in real time.
> >
> > So if your stream is
> > - 4:2:0
> > - with fewer than 63 million luminance samples per second,
> > - fewer than 80 megabits/sec,
> > - <= 1920 samples, <= 1152 lines, <= 60 fps,
> > - needs a VBV buffer of less than 1.2 megabytes,
> > - and uses <= 4608 bits per macroblock with two exceptions per row,
> >
> > my guess is that libmpeg2 can decode it in real time on a recent PC. If
> > you're looking to predict computational needs more accurately based on
> the
> > encoding parameters, those should be the sorts of parameters you'd want
> to
> > track and profile against.
> >
> > Best,
> > Keith
> >
> >
> >
> > On Thu, 28 Feb 2008, Krishna Prasad wrote:
> >
> > > Hello Keith
> > >
> > > I have a small clarification regarding the relationship between the
> Decoding
> > > Time and FrameSize. I would like to know what exactly is the
> relationship
> > > between both the parameters in a GOP and for a set of GOP'S in a
> MPEG2 video
> > > stream ?.
> > >
> > > Regards
> > > Krishna Prasad
> > >
> >
> >
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