Re: [Q] timecode for dropping frame?
Re: [Q] timecode for dropping frame?
- Subject: Re: [Q] timecode for dropping frame?
- From: JongAm Park <email@hidden>
- Date: Mon, 4 Jan 2010 18:08:20 -0800
How are you doing?
Yes. It was how it was solved. :)
What is curious is that QuickTime returns modified timecode when not
using timecode track.
It means it somehow manipulate the timecode, then I'm curious why it
doesn't put the standard DF timecode there.
There can be some decision on how they do so in implementation stage. :)
Anyway, I would like to appreciate your time on this issue.
Best regards,
JongAm Park
On Jan 4, 2010, at 1:35 PM, Darrin Cardani wrote:
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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