#!/bin/bash
#
# Script to convert a dv capture file to a compressed video suitable
# for uploading to video sharing web sites. (Rev 10)
#
# Usage: Takes one parameter - the input dv file (should have .dv extension). 
#        Output is a file with the same base name but a .avi extension.
#
# Originally by: Sandip Bhattacharya [ lists (at) sandipb . net ]
# Note: This script is in the public domain. Suggestions to improve this most
#       welcome. :)

### EDITABLE CONFIG VALUES ####################################################
# The default will convert a 16:9 DV input file to a 4:3 AVI file suitable for
# uploading to video sharing sites like Vimeo (http://vimeo.com). You normally
# don't need to change anything here. 
# 
# However, you can tweak VID_BITRATE up or
# down according to the quality/size tradeoff you want.
#
# Also, if your video is already in 4:3 size or if you want your output to 
# remain widescreen, set VID_169_TO_43 to 0.
##############################################################################

# Audio related
AUD_CODEC=mp3
AUD_BITRATE=64k

# Video related
VID_CODEC=h264         # One of the best video compression codec. Also
                       # Vimeo's recommendation
VID_KEYFRAME_FREQ=30   # As per vimeo's recommendation. 
VID_BITRATE=900k       # Video bitrate, higher values give better quality 
                       # but larger file size
VID_INPUT_INTERLACED=1 # 1, if your input video is interlaced. 0, if not.
                       # Most camcorders have interlaced video. So if you
                       # are not sure, leave this on.
VID_169_TO_43=1        # Set to 1 if you want to convert 16:9 to 4:3
VID_LETTERBOX_COLOR="000000" # Color of bars at the top and bottom
                             # When a widescreen input is converted
                             # 000000 = black ffffff=white
# Metadata
AUTHOR="Sandip Bhattacharya" # Embedded in the video metadata
COPYRIGHT="Copyright (c) 2008, Sandip Bhattacharya (lists AT sandipb.net )"
COMMENT="Video processed using ffmpeg (http://ffmpeg.mplayerhq.hu/)"

# Misc
SYS_NUM_THREADS=2      # Number of processing threads.
#VERBOSE=1
FFMPEG=/usr/bin/ffmpeg

###############################################################################
### DON'T EDIT ANYTHING BEYOND THIS POINT #####################################
###############################################################################

DEINTERLACE=
[ $VID_INPUT_INTERLACED == 1 ] && DEINTERLACE="-deinterlace"

SIZECHANGE=
[ $VID_169_TO_43 == 1 ] && \
  SIZECHANGE="-s 640x360 -padtop 60 -padbottom 60 -padcolor $VID_LETTERBOX_COLOR -aspect 4:3"


COPYRIGHT=${COPYRIGHT/ AT /@}

[ $# -eq 0 ] && 
   echo "Need the dv file to convert (Syntax: $0 <input.dv>)" && exit 1

INPUT=$1
OUTPUT=${1/.dv/.avi}

echo "Converting $INPUT => $OUTPUT"


$FFMPEG -threads $SYS_NUM_THREADS    \
       -f dv                        \
       -i $INPUT                    \
       -vcodec $VID_CODEC           \
       -g $VID_KEYFRAME_FREQ        \
       $DEINTERLACE                 \
       -b $VID_BITRATE              \
       $SIZECHANGE                  \
       -acodec $AUD_CODEC           \
       -ab $AUD_BITRATE             \
       -author "$AUTHOR"            \
       -copyright "$COPYRIGHT"      \
       -comment "$COMMENT"          \
       $OUTPUT