[FFmpeg-devel] [PATCH] H.264 I-frames with SEI are also key frames

Jason Garrett-Glaser darkshikari
Fri Mar 6 09:24:38 CET 2009

On Thu, Mar 5, 2009 at 11:52 PM, madshi <dear at madshi.net> wrote:
> Loren Merritt schrieb:
>> On Thu, 5 Mar 2009, madshi wrote:
>>> Would it make sense to consider I-slices as key frames only
>>> if no SEI recovery points are in the stream? Or in other
>>> words: As soon as you find a recovery point, you might no
>>> longer want to treat every I-slice as a key frame in that
>>> particular stream.
>> Not as a general strategy to apply to all streams. What about those that
>> have plenty of IDR-frames, and plenty of non-key I-frames, and no
>> recovery point SEIs? (i.e. everything generated by x264)
>> --Loren Merritt
> My suggestion is no worse in any way than the original
> suggestion, which was to handle all I-frames as key frames
> with no questions asked.
> Ok, how about an improved version of my suggestion:
> If:
> (1) there haven't been a new IDR frame for 3 (?) seconds runtime and
> (2) there was not a single SEI recovery point in the stream as of yet
> In this situation treat all I-frames as key frames.
> Not sure about the runtime. In what distance does x264 usually
> place IDR frames?

>= --min-keyint

Dark Shikari

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