[FFmpeg-user] Frame dropping

Carl Eugen Hoyos ceffmpeg at gmail.com
Wed May 9 20:52:25 EEST 2018

2018-05-09 19:51 GMT+02:00, Carl Eugen Hoyos <ceffmpeg at gmail.com>:
> 2018-05-09 17:53 GMT+02:00, 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 !!
> The option vsync allows to duplicate / drop decoded frames to
> maintain A/V sync, it is not related to the decoding speed.
> Use "-skip_loop_filter all" to get some speed-up without
> noticeable visual effect, use "-skip_frame noref" in addition to
> get significant speed-up for some videos, feel free to also try
> "-skip_frame bidir" (can cause artefacts iirc) and
> "-skip_frame nokey" (which skips nearly all frames).
> Please remember not to top-post here, Carl Eugen
> PS: vsync is neither an input nor an output option, it is a
> global option.

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