[MPlayer-users] Mencoder problem with encoding raw h264

[Oliver Seitz]

> Hi there. I have a BluRay source h264 stream in raw. I want to encode it
> in h264 with lower bitrate, so it possible to share it over network.
>
> I have just .264 file. Mplayer guesses it's FPS as 29.970 (30000/1001)
>
>     H264-ES file format detected.
>     FPS seems to be: 29.970030
>
> I'm passing this FPS value as mencoder option: -fps 30000/1001 and I
> want my output file in FPS 24000/1001, so, I'm passing also: -ofps
> 24000/1001.
>
> On encoding, mencoder outputs lots of messages: "1 duplicate frame(s)
> detected". In any other circumstances, I'm just ignoring this message.
> But not now.
>
> The length of this movie .264 is 26 minutes. I've encoded raw sound in
> ogg and mplayer tells me, that this ogg file is 26 minutes long. But
> after encoding video, I have 32 minutes of video.
>
> There are the problem, video has much longer duration, as you may see,
> audio/video resynchronization. How to solve it? I've done a lot of
> videos in that raw format, but only with this one I have problem.
>
> P.S. I've also tried to encode with -fps 24000/1001, but have the same
> effect.


26 minutes*30/24=32 minutes. It seems like you've just changed the frame
rate, copying frame by frame anyway.

You might need to use some video filter to interpolate or remove the
surplus frames.

Greets,
Kiste