[FFmpeg-user] Frame dropping

[mohammed bey ahmed khernache]

Thank you for your reply.
The input video is encoded with hevc at 25 fps.
I tries this command:
ffmpeg -threads 1 -vsync drop -i <input_video> -f null /dev/null
I got this message in yellow:
Encoder did not produce proper pts, making some up

Unfortunately, I can not reach 25 fps while decoding, even with dropping
frames.
So I think that the option for "frame dropping" is not working !!



On Wed, May 9, 2018 at 5:11 PM, Gabriel Balaich <roderrooder at gmail.com>
wrote:

> >
> > Hello,
> > could you tell me how to enable "frame dropping" while decoding with
> ffmpeg
> > ?
> >
>
> *"-vsync parameter*
> *Video sync method. For compatibility reasons old values can be specified
> as numbers. Newly added values will have to be specified as strings
> always.*
>
> *0, passthrough*
> *Each frame is passed with its timestamp from the demuxer to the muxer.*
>
> *1, cfr*
> *Frames will be duplicated and dropped to achieve exactly the requested
> constant frame rate.*
>
> *2, vfr*
> *Frames are passed through with their timestamp or dropped so as to prevent
> 2 frames from having the same timestamp.*
>
> *drop*
> *As passthrough but destroys all timestamps, making the muxer generate
> fresh timestamps based on frame-rate.*
>
> *-1, auto*
> *Chooses between 1 and 2 depending on muxer capabilities. This is the
> default method."*
>
> If I'm understanding you correctly -vsync should be what you are looking
> for.
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