以下是一些使用上的方法供日後參考:
- Extract part of MP4 video with start time and end time:
ffmpeg -hwaccel cuda -i Full.mp4 -ss 00:00:00 -to 00:00:17 PartA.mp4
- Extract part of MP4 video with start time and duration:
ffmpeg -hwaccel cuda -i Full.mp4 -ss 00:00:00 -t 00:00:17 PartA.mp4
- Crop video with height, width, left upper corner x, left upper corner y h:w:x:y
ffmpeg.exe -hwaccel cuda -i Full.mp4 -filter:v "crop=862:850:541:138" Cropped.mp4
- Reduce size of video by half
ffmpeg -hwaccel cuda -i Full.mov -vf "scale=iw/2:ih/2" Half.mov
- Encode with H264
ffmpeg -hwaccel cuda -i Full.mov -vcodec libx264 -crf 20 Full-H264.mov
- Encode with H265
ffmpeg -hwaccel cuda -i Full.mov -vcodec libx265 -crf 28 Full-H265.mov
- Make compatible to most browser (include IOS device)
ffmpeg -hwaccel cuda -i INPUT.MP4 -c:v libx264 -crf 23 -profile:v baseline -level 3.0 -pix_fmt yuv420p -c:a aac -ac 2 -b:a 128k -movflags faststart OUTPUT.MP4
以上只是一些簡單的用法，這工具還有更多的用法有待發掘。
Last Updated: 20210521
