[FFmpeg-devel] How do I display I-frames only in H.264

Rusty Waters rusty0829
Wed May 6 21:15:21 CEST 2009

Hi Bun Bun,

The frame rate is okay for SD (NTSC, PAL)? H.264 and also for HD H.264 (720p? and 1080p).
If your video has been properly time stamped, and your buffers are large enough to reorder the few that come out of order, then playback is smooth and not jumpy.
If you want to know how much H.264 you can decoder on a processor with a given CPU speed, L2 cache, and a given FSB specs (for memory access), I have some empirically generated statistics that might help.
The simple way would be to send me your computers information, such as processor model, L2 cache, FSB speed, and of cource, which version of OS, such as Windows and Linux, and the video card being used, so I could give you rendering estimates, as well.


--- On Wed, 5/6/09, bun bun <binhlh86 at yahoo.com> wrote:
From: bun bun <binhlh86 at yahoo.com>
Subject: Re: [FFmpeg-devel] How do I display I-frames only in H.264
To: "FFmpeg development discussions and patches" <ffmpeg-devel at mplayerhq.hu>
Date: Wednesday, May 6, 2009, 8:51 AM

I am working with H.264,too. do you have any experience with frame rate? does
frame rate (fps) affect the quality video coded H.264 ? please answer as clear
as possible.

--- On Mon, 5/4/09, Waters, Ralph <rwaters at pelco.com> wrote:

From: Waters, Ralph <rwaters at pelco.com>
Subject: [FFmpeg-devel] How do I display I-frames only in H.264
To: ffmpeg-devel at mplayerhq.hu
Date: Monday, May 4, 2009, 4:22 AM

Hi All,

> I'm not sure of all the ffmpeg lists and how to properly use them, so
> if I am in the wrong area for this question, I would greatly
> appreciate being pointed to the right area, and thank you in advance.
> I was wondering if anyone has any clue on how to just display I-frames
> only for a H.264 stream. I have had an easy time of getting MPEG-4 to
> display I-frame only data by using the pCodexCtx->skip_frame =
> AVDISCARD_NONKEY And it works like a charm. For H.264 this variable
> doesn't seem to work, although I'm not sure why. My h.264 profile
> baseline 3.1 and it contains only I and P frames.
> How can I throw the P-frames away, without taking the CPU time to
> decode them?
> Thanks, Rusty Waters

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