ffmpeg: split video at marks.
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# ffmpeg
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- Hardware accelerated MP4 video conversion
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## Split video at marks
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```
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ffmpeg -ss 00:00:00 -to 99:99:99 -i input.mp4 -c copy output.mp4
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```
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## Hardware accelerated MP4 video conversion
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```
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ffmpeg -i input_video.webm -vaapi_device /dev/dri/renderD128 -vcodec h264_vaapi -vf format='nv12|vaapi,hwupload' output_video.mp4
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```
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