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scragar

Member

Registered: 2009-07-14

Posts: 108

videosplit

Videosplit is something I wrote earlier today for an experiment working with videos that were simply too long for youtube to allow me to upload them. I present the code bellow. It's only dependency should be mencoder, but if anyone has any information on a dependency I missed I will update my comments.

#!/bin/bash

if [ ! -f "$1" ]; then
  echo "Error, usage: $0 <VIDEO_INPUT> [ <video length> [ <repeat length> ]]";
  exit;
fi

VIDEOIN="$1"
if [ -z "$3" ]; then
  OVER=30
else
  OVER=$(echo "$3" | grep -o \[0-9\]* | head -n 1)
fi
if [ -z "$2" ]; then
  CHUNK=570
else
  CHUNK=$[ $(echo "$2" | grep -o \[0-9\]* | head -n 1) - $OVER];
  if [ $CHUNK <= 0]; then
    echo 'Error, repeat length is too large';
    exit;
  fi
fi


eval "VIDLEN$(mplayer -identify "$VIDEOIN" -ao null -vo null -frames 0 2>/dev/null |
          grep ^ID_LENGTH | grep -o =\[0-9\]*)";

if [ "$VIDLEN" = "" ]; then
  echo "Not a video, exiting.";
  exit;
fi

PARTS=$[ ( $VIDLEN / $CHUNK ) ];
if [[ $PARTS = "0" ]]; then
  echo "No work to be done";
  exit
fi;


EXT=$(echo "$VIDEOIN" | grep -o '[^.]*$');
FNAME=$(basename "$VIDEOIN" | grep -o '.*[.]');

OPTIONS='-ovc copy -oac';
if [ "$EXT" = "mp4" ]; then
  OPTIONS="$OPTIONS pcm";
else
  OPTIONS="$OPTIONS copy";
fi

END=$[ $CHUNK + $OVER ];
for i in $(seq 0 $PARTS); do
  echo "part $i";
  START=$[ $i * $CHUNK ];
  mencoder "$VIDEOIN"                             \
                    -o "${FNAME}${i}.${EXT}"   \
                      $OPTIONS                       \
                    -ss $START                       \
                   -endpos $END        >/dev/null
done