title: How to read the MPEG2VideoDescriptor in an MXF file?
body: <p>Here follows the hex dump of the MPEG2VideoDescriptor:</p>
  
  <pre>
  06 0e 2b 34 02 53 01 01 0d 01 01 01 01 01 51 00
  83 00 00 f3 3c 0a 00 10 a3 be 51 b2 00 05 e7 11
  bf 82 21 97 f7 a0 14 ed 30 06 00 04 00 00 00 02
  30 01 00 08 00 00 ea 60 00 00 03 e9 <b>80 00 00 04</b>
  01 c9 c3 80 30 04 00 10 06 0e 2b 34 04 01 01 02
  0d 01 03 01 02 04 61 01 32 15 00 01 05 32 0e 00
  08 00 00 00 10 00 00 00 09 32 0d 00 10 00 00 00
  02 00 00 00 04 00 00 00 1a 00 00 00 00 32 0c 00
  01 00 32 08 00 04 00 00 02 d0 32 09 00 04 00 00
  05 00 32 02 00 04 00 00 02 d0 32 03 00 04 00 00
  05 00 32 01 00 10 06 0e 2b 34 04 01 01 03 04 01
  02 02 01 04 03 00 33 02 00 04 00 00 00 02 33 08
  00 04 00 00 00 01 33 03 00 01 04 33 01 00 04 00
  00 00 08 33 0b 00 01 00 33 07 00 02 00 00 33 04</pre>
  
  <p>The first 16 bytes:<br>
  <code>06 0e 2b 34 02 53 01 01 0d 01 01 01 01 01 51 00</code> (UID)<br>
  Next 4 bytes is the BER size:<br>
  <code>83 00 00 f3</code> (0xf3 bytes long)<br>
  Next 4 bytes:<br>
  <code>3c 0a 00 10</code> (0x3c0a means Instance UUID and 0x0010 is the size)<br>
  Then follows the UUID:<br>
  <code>a3 be 51 b2 00 05 e7 11 bf 82 21 97 f7 a0 14 ed</code><br>
  Next 4 bytes:<br>
  <code>30 06 00 04</code> (0x3006 means Linked Track ID and 0x0004 is the size)<br>
  Next 4 bytes is the Linked Track ID: <code>00 00 00 02</code><br>
  Next 4 bytes: <code>30 01 00 08</code> (0x3001 means Sample Rate and 0x0008 is the size)<br>
  The following 8 bytes are actually frame rate numerator and denominator:<br>
  <code>0000ea60</code> == 60000 and <code>000003e9</code> == 1001.
  Now we have the <b>bold</b> part: <b>80 00 00 04</b>
  .</p>
  
  <p>Can somebody please explain what does it mean?</p>
  
  <p>The next four bytes are <code>01 c9 c3 80</code> and it is definitely the bitrate (30000000), but how can I know that for sure?</p>
  
  <p>Edit:<br>
  Does <b>80 00 00 04</b> mean the following:<br>
  0x8000 is a dynamic tag. According to SMPTE 337, tags 0x8000-0xFFFF are dynamically allocated. The 0x0004 is the size (4 bytes). If that's true, how can I tell that the following 4 bytes <code>01 c9 c3 80</code> are actually the bitrate? It could be anything, or?</p>