Converting Frames to Milliseconds at 29.97fps

[koberulz]

I have a Premiere Project, 29.97fps, which has chapter points.

I exported as uncompressed AVI. Next step is x264, CRF, force keyframes at the chapter points, then insert said chapter points in MKVToolnix. Both of which require the time in hours, minutes, seconds, and milliseconds. Easy enough at 25fps, which is what I usually work at, just multiply the frame number by four. At 29.97...not so much.

How do I go about this?

[ProWo]

29.97 fps (frames per second), 1 second= 1000ms, 1000/29.97=33.3667000333667
Result: 1 frame has a duration of 33.3667000333667ms

[koberulz]

On average, sure. But if I want to hit a specific frame, it's surely not that simple is it? I mean, there's two different ways of displaying the timecode when using frames, for starters, which will each give different results, never mind anything else.

[johnmeyer]

I use Excel for this. Put your existing chapter timecodes in a column. You didn't say what format these timecodes are in, but if they are frames, I would use the frame duration given by ProWo and multiply each "timecode" given in frames by that factor to give you seconds. I'd then convert each decimal timecode given in seconds into hours, minutes, and decimal seconds using Excel's various time functions.

[hello_hello]

Would MPC-HC's Navigate menu be of any help?

You can right click on the time in the status bar to choose "high precision" and time elapsed, so when you navigate to a frame it'll tell you where you are time-wise, or if you navigate to a particular time, you can open the Navigate menu again to check the number of the frame you landed on.

Or there's ffdshow's on-screen display. Some players might have something similar built-in. Potplayer maybe?

What are the two different ways of displaying timecode? I don't follow that, but wouldn't it apply to any frame rate?

[johnmeyer]

Hello2 brings up a good point. Some programs let you change the timecode display. My NLE Vegas does this. When I am in that program, I just change the timecode to whatever I need in the program I'm exporting to, and Vegas does the conversion for me. Perhaps your program has an option somewhere that will let you do this.

[poisondeathray]

You can toggle the display in PP too to whatever format you want

Or use ChapterGen , it can load and convert between different formats, and export several types of formats, including a qpfile for x264, and ogg text file for mkvtoolnix chapters

[koberulz]

Premiere doesn't do milliseconds.

Would MPC-HC's Navigate menu be of any help?

Everything is greyed out, so I guess not.

What are the two different ways of displaying timecode? I don't follow that, but wouldn't it apply to any frame rate?

Well for example frame 185823 can be either 01;43;20;09 or 01:43:14:03.

[poisondeathray]

Premiere doesn't do milliseconds.

In PP - left click the fly out menu in the sequence, enable "show audio time units" , right click the display and select milliseconds

[koberulz]

Huh. I had no idea it did that, I've been doing all this math instead.

[poisondeathray]

Another "tip" - lets say you need both frames and hh:mms.ms notation - or whatever notation combination for whatever reason . But it's a bit of a pain to toggle between display formats on the sequence. You add the "timecode" effect and set that to display say, frames, and the sequence to display hh:mms.ms notation. So now you have both simultaneously. (Obviously you can disable the timecode effect when exporting)