[FFmpeg-user] ffmpeg create wrong time information

[Gyan Doshi]

On 2021-12-21 08:14 pm, Cecil Westerhof via ffmpeg-user wrote:
> I have the recording of a zoom meeting where I need to cut out a
> portion from and the first little bit has to be blacked out.
>
> I use the following command:
>      ffmpeg -y                                    \
>          -ss 00:26:05                             \
>          -to 00:44:04                             \
>          -i input.mp4                             \
>          -vf "
>               drawbox=enable='between(t, 0, 1.6)' :
>                  color     = black                :
>                  w         = in_w                 :
>                  h         = in_h                 :
>                  thickness = fill
>          "                                        \
>          -acodec copy                             \
>          -vcodec libx264                          \
>          -crf 23                                  \
>          -preset veryfast                         \
>          output.mkv
>
> This creates a seemingly correct file, with one little problem: the
> time starts at 00:00:27 and ends at 00:18:26. (As displayed by the
> player mpv.)

This should work. Where are the keyframes in the video stream?

Regards,
Gyan