There is a problem with converting ffmpeg video from hev1 to hvc1

ffmpeg -i in.mp4 -c:v copy -c:a copy -tag:v hvc1 out.mp4

I used ffmpeg to transcode the videos, but some of the transcoded videos were black screens with audio but no visuals.

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By using ffmpeg -i video.mp4 to view the video information, it was found that the information for both videos is consistent. However, the screen in Figure 1 displays a black screen after transcoding, whereas Figure 2 functions normally after transcoding.