> On 01 May 2015, at 13:06, Haris Zukanovic <[email protected]> wrote: > > Is the decision about exactly which frame to make an IDR frame made in x264 > or ffmpeg? In general I-frames are placed at scene-changes, this can happen random. Additionally you can can force an I-frame every arbitrary amount of frames by specifying the gop-size. The function of an I-frame is to hold max frame info P and B frames build on that complete I-frame. It doesn’t make sense from an encoding viewpoint to skip an I-frame at a scene-change, it’s just impossible. Adding more than ‘a minimum amount’ of I-frames only makes sense for seeking purposes, at the cost of less compression/higher then necessary bitrate. > Any pointer or advice on where to look for this in the code? > > > On 4/29/15 8:54 PM, Anatol wrote: >> No responses on that one? >> It is very important issue. >> >> On Mon, Apr 27, 2015 at 11:47 PM, Haris Zukanovic < >> [email protected]> wrote: >> >>> Hello, >>> Can I use force_key_frames in some way to produce keyframes (IDR, not >>> I-frames) at exactly the same PTS in output streams as they are found in >>> the live input stream? Both input and output are h264 and live streaming. >>> >>> Something analogous to using 2 pass encoding for VOD and in the second >>> pass keyframes are inserted exactly where they are recorded in the first >>> pass... Is that something like that even theoretically doable for live >>> streaming? >>> >>> >>> >>> thanx >>> >>> -- >>> -- >>> Haris Zukanovic >>> >>> _______________________________________________ >>> ffmpeg-user mailing list >>> [email protected] >>> http://ffmpeg.org/mailman/listinfo/ffmpeg-user >>> >> _______________________________________________ >> ffmpeg-user mailing list >> [email protected] >> http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > -- > -- > Haris Zukanovic > > _______________________________________________ > ffmpeg-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/ffmpeg-user
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