[FFmpeg-user] on frame changes in recode

Moritz Barsnick barsnick at gmx.net
Fri Apr 29 11:02:42 CEST 2016

On Thu, Apr 28, 2016 at 23:31:57 +0200, Xen wrote:
> Basically there is no other information unless you want the number of 
> spaces typed on average every day on my system.

That would be very kind of you. I can recommend some keyloggers, but
ask you to do the math for getting the average.

> * whether I use gstreamer (pitivi) or avidemux or ffmpeg
> * the output always has the 2nd frame duplicated, and the "scene" 
> prolonged from 11 frames to 12 frames.

I stepped through both the input video (downloaded using youtube-dl
with your command) and "output.mp4" in two ways:
- mplayer and the '.' key;
- dumping frames to images using ffmpeg and "vsync -0" (I hope that's
  correct for dumping exactly one output frame for every input frame).

I both cases, the transitions look identical, frame by frame.

> You can easily reproduce it given above command.

Sometimes, the answer can already be in the log (see my other answer).
Admitted, not here.

> All of this is unnecessary, but if it makes you happy, here you have it 
> ;P.

I'm happy just shutting my mouth and letting unresolved problems stay

> Maybe you think I'm nitpicking but I'm just concerned that the simplest 
> of edit operations result in this corruption.

That is of course a quite valid issue, be it a bug or just incorrect
use of ffmpeg.


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