Common Output Options

General FFmpeg Usage

Option	Description
`-c:v`	Video encoder; `copy` copies the stream directly
`-c:a`	Audio encoder
`-b:v` / `-b:a`	Target video or audio bitrate
`-maxrate`	Maximum video bitrate constraint
`-bufsize`	Rate-control buffer size
`-r`	Output frame rate
`-g`	GOP length, or keyframe interval
`-pix_fmt`	Output pixel format
`-ar`	Audio sample rate
`-ac`	Number of audio channels
`-movflags +faststart`	Move the MP4 index to the beginning for progressive web playback

Create an MP4 suitable for web playback:

ffmpeg \
  -i input.mp4 \
  -c:v libx264 \
  -crf 23 \
  -c:a aac \
  -movflags +faststart \
  output-web.mp4