FFmpeg commands

ffmpeg.sh

# linux screengrab
ffmpeg -f x11grab -video_size 1024x768 -i $DISPLAY -s 1024x768 -r 25 -preset ultrafast -b:v 10M output.mp4

# windows screengrab
ffmpeg -f gdigrab -video_size 1920x1200 -i desktop -s 1920x1200 -r 30 -preset ultrafast -b:v 10M wingrab.mp4

# screengrab with visible region
ffmpeg -f x11grab -video_size 1080x608 -show_region 1 -grab_x 100 -grab_y 100 -i $DISPLAY -s 1080x608 -r 25 -preset ultrafast -b:v 10M output.mp4

# video cut (no rerender)
ffmpeg -ss 00:00:00.00 -i input.mp4 -c copy -t 01:01:00.00 output.mp4

# animated gif
ffmpeg -ss 00:00:43.5 -i input.mp4 -t 00:00:02.00 -r 15 -s 480x270 output.gif

# double the speed of the video
ffmpeg -i input.mp4 -filter:v "setpts=0.5*PTS" output.mp4

# h265 encode
ffmpeg -i input.mp4 -c:v libx265 -crf 28 -c:a aac -b:a 128k output.mp4

https://trac.ffmpeg.org/wiki/How%20to%20speed%20up%20/%20slow%20down%20a%20video

http://blog.pkh.me/p/21-high-quality-gif-with-ffmpeg.html

Fade in and out (audio and video) for a 16-seconds video:
ffmpeg -i input.mp4 -filter_complex "[0:v]fade=type=in:duration=1,fade=type=out:duration=1:start_time=15[v];[0:a]afade=type=in:duration=1,afade=type=out:duration=1:start_time=15[a]" -map "[v]" -map "[a]" output.mp4

DnxHD:

fmpeg -i input.mp4 -vcodec dnxhd -acodec pcm_s16le -s 1920x1080 -r 30000/1001 -b:v 36M -pix_fmt yuv422p -f mov output.mov

Davinci output to MP4:

ffmpeg -i input.mov -vf yadif -codec:v libx264 -crf 1 -bf 2 -flags +cgop -pix_fmt yuv420p -codec:a aac -strict -2 -b:a 384k -r:a 48000 -movflags faststart output.mp4

https://www.tal.org/tutorials/ffmpeg_convert_to_dnxhd
https://alecaddd.com/davinci-resolve-ffmpeg-cheatsheet-for-linux/

hardware transcoding (nvidia)

h264/AAC -> DNxHR/PCM (with hardware decoding, deinterlace and clip-cut)

ffmpeg -ss 00:03:50.00 -c:v h264_cuvid -i ./CLIP.MTS -vf bwdif -c:v dnxhd -c:a pcm_s16le -profile:v dnxhr_sq -pix_fmt yuv422p -f mov -t 00:00:15.00 ./clip.mov

h264/AAC -> DNxHR/PCM (with hardware decoding and clip-cut)

ffmpeg -ss 00:04:45.00 -c:v h264_cuvid -i ./CLIP.MP4 -c:v dnxhd -c:a pcm_s16le -profile:v dnxhr_sq -pix_fmt yuv422p -f mov -t 00:00:10.00 ./clip.mov

DNxHR/PCM -> h264/AAC (yt)

ffmpeg -i clip.mov -codec:v h264_nvenc -bf 2 -flags +cgop -pix_fmt yuv420p -b:v 12M -codec:a aac -strict -2 -b:a 384k -r:a 48000 -movflags faststart clip.mp4

DNxHR/PCM -> h265/AAC (hq)

ffmpeg -i ./clip.mov -c:v hevc_nvenc -preset slow -rc cbr_hq -cbr 1 -2pass 1 -b:v 20M -c:a aac -b:a 384k ./clip.mp4

DNxHR/PCM -> h265/AAC (yt)

ffmpeg -i ./clip.mov -c:v hevc_nvenc -preset slow -rc vbr_hq -b:v 12M -c:a aac -b:a 384k ./clip.mp4