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
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