50i mode and Avid

John Mitchell · October 10th, 2005, 08:08 AM

Anyone with in depth knowledge of the IEEE1394 stream might be able to help here:

Basically if I record in DV50i mode on JVC101E - and then try and capture from a DSR1500AP via RS422, the Avid recognizes the tape as a drop frame tape! It will only mark in drop frame timecodes with the ;;; separators. And then promptly refuses to digitise, because the expected format is naturally non-drop (well it's PAL - that's logical). Other tapes recorded in other cameras @50i (including DVCPro, DVCam, MiniDV) do NOT exhibit this problem from this deck.

When I try to digitise over firewire from the deck I get a similar problem, though not identical - the Avid drops in the correct inpoint at mark-in at 50i(eg 00:00:10:00) but will set an unasked for outpoint of 23;59;59;24. At some stage during the record it may crash out with the message non-drop timecode was encountered when drop frame was expected.

Does anyone know if there's some kind of drop/non drop flag in the IEEE1394 stream that is independent of frame rate? Could the JVC be setting this incorrectly? Or it may just be that the Avid interprets any kind of glitch in the timecode stream as drop/non drop error...

I have now duplicated this on 3 separate Avid systems (Meridien [even stranger error], Adrenaline and Xpress Pro), and two different HD101E's.

October 10th, 2005, 08:08 AM	#1
John Mitchell Contributor Join Date: Jul 2005 Location: Sydney Australia Posts: 873	50i mode and Avid - weird timecode glitch? Anyone with in depth knowledge of the IEEE1394 stream might be able to help here: Basically if I record in DV50i mode on JVC101E - and then try and capture from a DSR1500AP via RS422, the Avid recognizes the tape as a drop frame tape! It will only mark in drop frame timecodes with the ;;; separators. And then promptly refuses to digitise, because the expected format is naturally non-drop (well it's PAL - that's logical). Other tapes recorded in other cameras @50i (including DVCPro, DVCam, MiniDV) do NOT exhibit this problem from this deck. When I try to digitise over firewire from the deck I get a similar problem, though not identical - the Avid drops in the correct inpoint at mark-in at 50i(eg 00:00:10:00) but will set an unasked for outpoint of 23;59;59;24. At some stage during the record it may crash out with the message non-drop timecode was encountered when drop frame was expected. Does anyone know if there's some kind of drop/non drop flag in the IEEE1394 stream that is independent of frame rate? Could the JVC be setting this incorrectly? Or it may just be that the Avid interprets any kind of glitch in the timecode stream as drop/non drop error... I have now duplicated this on 3 separate Avid systems (Meridien [even stranger error], Adrenaline and Xpress Pro), and two different HD101E's.