[Libav-user] Empty .MTS output videos when using -ss command line argument

[Simon Daniels]

Weird -- any idea why there's only 1 key frame? I guess that's what the
camera decided to do...

On Wed, May 9, 2012 at 8:22 AM, Alex Cohn <alexcohn at netvision.net.il> wrote:

> On Mon, Apr 16, 2012 at 7:05 PM, Simon Daniels <simondaniels23 at gmail.com>
> wrote:
> > Hi guys,
> >
> > I have a set of .MTS files that I'm trying to splice. If I start at
> 0:00:00,
> > the output video works fine. But if I start splicing any time after
> 0:00:00,
> > the output video is empty. I've used the exact same command line with
> other
> > .MTS files and had no problem. It seems like something specific to this
> > Panasonic Lumix camera. MP4 and MOV files work fine too.
> >
> > This repros in FFmpeg HEAD-8dfb13e, 0.10.2, and 0.8.3.
> >
> > Any ideas? Thanks!
> >
> > Users-MacBook-Pro:ffmpeg-0.10.2 user$ ./ffmpeg -ss 00:00:01 -t 00:00:25
> -i
> > 00004.MTS -threads 3 -acodec copy -vcodec copy "output.MTS"
>
> Your input video stream has only one keyframe, which is the first
> frame. For h264, -vcodec copy can only start writing video from a
> keyframe. That's why it produces 0 frames in the end.
>
> BR,
> Alex Cohn
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