Hi Luca. You mean that ffmpeg can insert I frames as needed, even at larger gop?
Regards. 2008/8/28, Luca Abeni <[EMAIL PROTECTED]>: > Stas Oskin wrote: > > Hi. > > > > > > Thanks for the explanation, I presume you used it with analogue > > content (Interlaced), and with large bitrates? > > > If I remember well, it was analog TV captured from a bt card, > resampled to 352x288 an compressed at about 300kbps / 500kbps. > > > > > About gop_size, I might be wrong of course, but doesn't it set the > > interval of sending intra-frame? > > > I think yes. > > > > > So if it set it to 25 (over 10 like in example), doesn't it actually > > causes FFMPEG to produce less intra-frames, and thus leaving more to > > prediction, and to resulting in-accuracy/lesser quality? > > > Intra frames are bigger, so if you use more I frames you need a > higher bitrate. If there is not much motion in the video, using > large GOPs increases the quality (and if there is more motion in the > video, ffmpeg is able to insert I frames earlier... I do not remember > if this behaviour is the default, but I think it is). > > > > > Luca > _______________________________________________ > libav-user mailing list > [email protected] > https://lists.mplayerhq.hu/mailman/listinfo/libav-user > _______________________________________________ libav-user mailing list [email protected] https://lists.mplayerhq.hu/mailman/listinfo/libav-user
