NOT MY SCRIPT(just saving it from being lost on kinodv.org) This utility will search any file and look for what appears to be a DV video frames and copy them into a new Raw DV file.

salvagedv.py

#!/usr/bin/env python
"""
This utility will search *any* file and look for what *appears* to be a DV
video frames and copy them into a new Raw DV file.
Written by Dan Dennedy <dan@dennedy.org>
"""

import sys

def is_dv_1(s):\
  return ord(s[0]) == 0x1f and ord(s[1]) == 0x07 and ord(s[2]) == 0x00

def is_dv_2(s):
  return ord(s[1]) == 0x07 and ord(s[2]) == 0x00 and ord(s[3]) == 0xff

def is_pal(s):
  return (ord(s[3]) & 0x80)

if len(sys.argv) < 3 or sys.argv[1][0] == '-':
  print 'Usage', sys.argv[0], '<input-file> <output-file>'
  sys.exit(0)

inputFilename = sys.argv[1]
outputFilename = sys.argv[2]
print 'Salvaging from', inputFilename, 'into', outputFilename

pos = 0
count = 0
input = open(inputFilename, 'rb')
output = open(outputFilename, 'wb')

while True:
  input.seek(pos)
  dif1 = input.read(480)
  if not dif1:
    break
  if is_dv_1(dif1):
    dif2 = input.read(480)
    if not dif2:
      break
    if is_dv_2(dif2):
      size = (is_pal(dif1) and (480 * 300) or (480 * 250))
      frame = input.read(size - 480 * 2)
      if frame:
        output.write(dif1)
        output.write(dif2)
        output.write(frame)
        count += 1
        if count % (size/4800) == 0:
          print '\rSalvaging frame', count,
          sys.stdout.flush()
        pos += size
      else:
        break
    else:
      pos += 1
  else:
    pos += 1

input.close()
output.close()
print '\nSalvaging frame %d. Done.' % (count,)
sys.exit(0)