JakeTrock · September 14, 2022 14:26 · Sep 14, 2022
diff --git a/salvagedv.py b/salvagedv.py
@@ -0,0 +1,63 @@
+#!/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 <[email protected]>
+"""
+
+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)
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