markdown FFmpeg的

Posted 2021-05-06

## Convert
### To HAP Alpha
`ffmpeg -i in.mp4 -vcodec hap -format hap_alpha out.mov`

### To HEVC (x265) GPU
`ffmpeg -hwaccel cuvid -i in.mkv -c:v hevc_nvenc -preset slow -b:v 8M -maxrate:v 8.5M -pix_fmt yuv420p out.mkv`

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## Extract
### Aiff from H264
`ffmpeg -i in.mp4 out.aiff`

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## Probe
`ffprobe -i in.mkv -show_format -hide_banner`

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## Other
### Concat SRT
`ffmpeg -i "concat:in-0.srt|in-1.srt" -c copy out.srt`

### Mapping (Convert Video, copy Audio and Subtitles)
`ffmpeg -i in.mkv -map 0:0 -map 0:2 -map 0:30 -c:v hap -format hap_alpha -c:a copy -c:s copy out.mkv`

### Remove Chapters
`-map_chapters -1`

### Trim without encoding
`-ss 00:00:00 -t 00:00:03`
1st timecode: start time / 2nd timecode;

### 'too many packets buffered for output' bug
`-max_muxing_queue_size 1024`

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## Examples
### To HEVC with chapter selection and max muxing
`ffmpeg -hwaccel cuvid -i in.mkv -max_muxing_queue_size 1024 -map 0:0 -map 0:30 -map 0:31 -c:v hevc_nvenc -preset slow -b:v 8M -maxrate:v 8.5M -pix_fmt yuv420p -c:a copy -c:s copy -map_chapters -1 out.x265-Hubris.mkv`

### Trim without encoding
`ffmpeg -i in.mov -ss 00:00:00 -t 00:00:03 -async 1 -c copy out.mov`