Fix warning of changing video frame properties on the fly

[whoyao]

Fix the following warnings when using the NVIDIA hardware encoder:

[in @ 0x755f1600] filter context - w: 1024 h: 1024 fmt: 2, incoming frame - w: 1024 h: 1024 fmt: 119 pts_time: NOPTS
[in @ 0x755f1600] Changing video frame properties on the fly is not supported by all filters.

Resolve issue #3317

[pytorch-bot]

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[whoyao]

Now, the filter can be set correctly by the following code:

video_config = dict(
    format='cuda',
    frame_rate=25,
    width=256,
    height=256,
    hw_accel='cuda:0',
    encoder='h264_nvenc',
    encoder_format='rgb0',
    encoder_option={'gpu': '0'},
)
stream.add_video_stream(**video_config)

[mthrok]

Fixed by #3426