Hendrik Leppkes <h.leppkes@...> writes: > On Thu, Jul 19, 2012 at 8:18 AM, Carl Eugen Hoyos wrote: > Michael Bradshaw <mbradshaw <at> ...> writes: > > But when I seek, the first packet returned out of the demuxer is > > not a keyframe packet, and I have to read several (~45ish) packets > > until I encounter a keyframe. > > Could you provide a sample that does not seek to a keyframe with > ffmpeg -ss x -i input out.png > (I tested this yesterday on random mpeg2video samples and afaict, > it did work.) > > This test is somewhat meaningless because it'll skip > non-keyframes in the decoder until it finds one.
Isn't this necessary for some codecs / at least for H264? Wouldn't the API do exactly the same? > But the idea is to ensure that you can decode as of time X, > which means you need to seek to the last keyframe *before* > time X, which is something that is not supported currently. I see. (But am I wrong to assume that this is not generally possible, assuming large GOPs?) Carl Eugen _______________________________________________ Libav-user mailing list Libav-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/libav-user