From here

First convert the subtitles to .ass format:

ffmpeg -i sub.srt sub.ass

Then add them using a video filter:

ffmpeg -i in.mp4 -vf ass=sub.ass out.mp4

Extract the frames from a video

To extract all frames from between 1 and 5 seconds, and also between 11 and 15 seconds:

ffmpeg -i in.mp4 -vf select='between(t,1,5)+between(t,11,15)' -vsync 0 out%d.png

To extract one frame per second only:

ffmpeg -i in.mp4 -fps=1 -vsync 0 out%d.png

Rotate a video

Rotate 90 clockwise:

ffmpeg -i in.mov -vf "transpose=1" out.mov

For the transpose parameter you can pass:

0 = 90CounterCLockwise and Vertical Flip (default)
1 = 90Clockwise
2 = 90CounterClockwise
3 = 90Clockwise and Vertical Flip

Use -vf "transpose=2,transpose=2" for 180 degrees.

Download “Transport Stream” video streams

  1. Locate the playlist file, e.g. using Chrome > F12 > Network > Filter: m3u8
  2. Download and concatenate the video fragments:
ffmpeg -i "path_to_playlist.m3u8" -c copy -bsf:a aac_adtstoasc out.mp4

If you get a “Protocol ‘https not on whitelist ‘file,crypto’!” error, add the protocol_whitelist option:

ffmpeg -protocol_whitelist "file,http,https,tcp,tls" -i "path_to_playlist.m3u8" -c copy -bsf:a aac_adtstoasc out.mp4

Mute some of the audio

To replace the first 90 seconds of audio with silence:

ffmpeg -i in.mp4 -vcodec copy -af "volume=enable='lte(t,90)':volume=0" out.mp4

To replace all audio between 1’20” and 1’30” with silence:

ffmpeg -i in.mp4 -vcodec copy -af "volume=enable='between(t,80,90)':volume=0" out.mp4

Deinterlace

Deinterlacing using “yet another deinterlacing filter”.

ffmpeg -i in.mp4 -vf yadif out.mp4

Create a video slideshow from images

Parameters: -r marks the image framerate (inverse time of each image); -vf fps=25 marks the true framerate of the output.

ffmpeg -r 1/5 -i img%03d.png -c:v libx264 -vf fps=25 -pix_fmt yuv420p out.mp4

Extract images from a video

  • Extract all frames: ffmpeg -i input.mp4 thumb%04d.jpg -hide_banner
  • Extract a frame each second: ffmpeg -i input.mp4 -vf fps=1 thumb%04d.jpg -hide_banner
  • Extract only one frame: ffmpeg -i input.mp4 -ss 00:00:10.000 -vframes 1 thumb.jpg

Metadata: Change the title

ffmpeg -i in.mp4 -map_metadata -1 -metadata title="My Title" -c:v copy -c:a copy out.mp4