framerate

#!/bin/sh
help() { cat <</help
Usage: framerate [--count] FILE
Reads or calculates and then displays FPS for each stream in given movie(s)

Streams are identified by their codec.  Some audio codecs have "frames" too.

A part of media-scripts,  https://github.com/adamhotep/media-scripts
framerate v0.3+20160103 copyright 2010+ by Adam Katz, GPL
/help
exit
}

while [ -n "$1" ] && [ ! -f "$1" ]; do
  case "$1" in
    ( -c | -count* | --count* | -true* | --true* ) COUNT="-count_frames" ;;
    ( -h | --help | -ch | -hc ) help ;;
    ( -- ) shift; break ;;
    ( -* ) echo "Invalid option $1 ... Try --help" >&2; exit 2 ;;
    ( * ) break ;;
  esac
  shift
done

if ! command -v ffprobe >/dev/null 2>&1; then
  echo 'ERROR: command `ffprobe` (from FFmpeg) is required for this program' >&2
  exit 2
fi

for input in "${@:-/dev/stdin}"; do

  if [ "$#" -gt 1 ]; then
    FNAME="$input:"
  fi

  ffprobe -show_streams $COUNT "$input" 2>&1 |awk -v FNAME="$FNAME" -F '[=:]' '
    /^ *Duration: [0-9]/ { # backup duration
      master_duration = $0
      gsub(/,.*/, "", master_duration)
      sub(/.*Duration: */, "", master_duration)
      split(master_duration, time, ":")
      master_duration = time[1] * 3600 + time[2] * 60 + time[3] # H + M + S.ss
    }
    /^ *Stream.* Video: .*[0-9] fps,/ && ! master_fps { # backup FPS
      master_fps = $0
      gsub(/ fps,.*/, "", master_fps)
      gsub(/.*, /, "", master_fps)

      master_codec = $0
      gsub(/,.*/, "", master_codec)
      sub(/.*Video: /, "", master_codec)
      gsub(/ \(.*/, "", master_codec)
    }
    $1 == "codec_name"     {
      codec = $2
      duration = frames = rate = 0
    }
    $1 == "duration" && $2 != "N/A" { duration = $2 } # per-stream backup
    $1 == "nb_read_frames" && $2 != "N/A" { # this is N/A w/out -count_frames
      frames = $2
    }
    $1 == "avg_frame_rate" {
      rate = $2
    }
    $1 $2 == "TAGDURATION" || codec && $1 == "[/STREAM]" {
      if (frames) {
        if ($2 == "DURATION") {
          # duration comes from:  sec + minutes * 60 + hours * 3600
          tmp = $NF + $(NF-1) * 60 + $(NF-2) * 3600
          if (tmp) { duration = tmp }
        }
        if (! duration) { duration = master_duration }
        printf "%s%s %f\n", FNAME, codec, frames / duration
        retval = 1
      } else if (rate != 0 && rate != "0/0") {
        split(rate, division, "/")
        printf "%s%s %f\n",
          FNAME, codec, division[1] / division[2]
        retval = 1
      }
      codec = ""  # prevent repeating at end of stream
    }
    END {
      if (retval != 1 && master_fps) {
      	printf "%s%s %f\n", FNAME, master_codec, master_fps
      	exit 0
      }
      exit 1 - retval
    }
  '

done