On 2021-08-23 10:45 am, Adam Nielsen via ffmpeg-user wrote:
why is the framerate automatically changed here from 29.98 fps to 120
fps, and how can I prevent from this ?

    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 
1280x720, 2508 kb/s, 29.98 fps, 120 tbr, 90k tbn, 2k tbc (default)
 From what I can find, "tbr" is the target framerate the media is
indicating it wants.  So ffmpeg is just respecting that value.

I guess you could use the -r option to override this and force a
specific framerate if you want something different?  Or you could fix
the metadata in the source file to have the correct target framerate to
begin with.

`-tbr` is the framerate required to retain the smallest interval between frames in the jnput.

You can add `-fpsmax 30` with v4.4 or newer. This will limit output rate to 30 if the input is higher else keep the original rate.

Regards,
Gyan
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