Re: [Q] timecode for dropping frame?
Re: [Q] timecode for dropping frame?
- Subject: Re: [Q] timecode for dropping frame?
- From: Darrin Cardani <email@hidden>
- Date: Mon, 4 Jan 2010 13:35:57 -0800
I'm not up on my QT skills lately, but the way I've done this in the
past is to create a timecode track and set the TimeCodeDef flags of
the TimeCodeDescription to include tcDropFrame. Are you doing that?
Darrin
On Dec 27, 2009, at 9:55 AM, JongAm Park wrote:
I would like to add some more information I asked in quicktime-apl
mailing list.
The issue was the the timecode returned by [[qtMovie
attributeForKey:QTMovieCurrentTimeAttribute] QTTimeValue]; or
currentTime returns somewhat weird timecode for dropping frame video
files.
However, the FCP and the QuickTime player ( not X ) displays the
timecode correctly for dropping frame video clips.
This is the pattern I found :
Left : timecode from QuickTime API, which is not right.
Right : timecode overlay imposed by FCP, which is correct (QuickTime
Player also shows this timecode. )
Time from QT : 33 sec 28
Overlay : 33 sec 28
34 sec 00 ( jump 1
frame) 33 sec 29 (continue)
34 sec
01 34 sec 00
34 sec
02 34 sec 01
Time from QT : 59sec 29
Overlay : 59;28
1 min 00 sec
00 59;29
1 min 00 sec
01 1:00;02 ( jumping 2
frames) ( This is correct. At every 1 min, timecodes for 2 frames
are dropped. )
1 min 06 sec
28 1:06;29
1 min 07 sec 00 (jump 1
frame ) 1:07;00
1 min 39 sec
28 1:39;28
1 min 40 sec 00 (jump 1
frame ) 1:39;29
1 min 40 sec 01 1:40;00
1 min 59sec
29 1:59;28
2 min 00 sec
00 1:59;29
2 min 00 sec
01 2:00;02 ( jumping
2 frames)
2 min 00 sec
02 2:00;03
2 min 13 sec
28 2:13;29
2 min 14 sec 00 (jump 1
frame) 2:14;00
For me to let my program display the correct timecode, I should
either have unmodified timecode to have it increased by 2 frame at
every 1 min, or QuickTime API should detect that the clip is DF one
and return correct time code. However, it drops 1 frame at every
33rd or 34th frame ( I'm not sure it is always so. )
So, is there any way to retrieve correct timecode?
Thank you.
JongAm Park _______________________________________________
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Darrin Cardani
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