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Editing when mpg is your only source, while avoiding rerendering

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I have one nearly 4 hour video clip of a fireplace loop. The program is supposed to start with a fade in from black, wide angle shot, which then zooms into the fireplace. It then loops about 5-6 minutes of the log burning, cross fading to keep the loop going, which you can notice the fade of the log going to a previously burnt phase. Every 15 minutes, the camera pans out to the wide angle shot, crossfades back to the start and zooms back in to the log. At the 90 minute and 3 hour mark, it breaks for a station ID. The audio consists of Christmas music, but the brief station IDs has it's own sound.....it is this that is causing the precision to be important, I need the station ID animation to match the audio.

The 4 hour recording off of TV missed the beginning and end. I was able to obtain the music that would have gone with this, and make a full soundtrack. So, since this is a loop, I can patch the beginning and end by going to the point after the first station ID, because that also contains the starting point of this loop, fade in from black to the wide angle shot that then zooms in to the 5/6 minute loop. I then need to make a new ending by using a part of before the first station ID, because that zooms out and fades to black before the station ID as well.

But, to keep the station IDs lining up right, I need my new beginning and ending clips to be timed right, or within a few frames. So, that's why I've been using vegas, to make my cut, shift drag, and then figure out how much I need for each new beginning and end, and have it be the right time. I was hoping to use vegas only to determine where the cuts need to be made, and then mpg2cut2 to figure out what frames I can cut on, and have it still time out right. I could re-encode with vegas, but I don't want to re-encode, which is why I'm trying to create 3 clips out of the same clip, and then join them. I really don't want to do any re-encoding at all. I should be able to use mpg2cut2 to edit the original clip into new beginnings and endings that time out right, but.....since the time readout in vegas doesn't match the time readout in mpg2cut2, I can't make accurate edits in mpg2cut2.


What is really throwing me off is that my clip is reading time differently in different programs. When I find the frame I want to edit at in vegas, and go to that same frame in mpg2cut2, and the time is different. The first black frame after the station id according to vegas is 01:28:40 frame 6, in mpg2cut2 01:28:41 frame 19, over a second difference! I don't know what is causing this. I seem to always run into issues with my odd specific things I set out to do in video, that always seem to find inconsistencies in different programs, which suggests buginess in the software to me, I'm not looking to attack these things, but it is extremely frustrating when the tools I go to use consistently don't seem to work right.

What would cause these timing issues? Is there better software I can use? I know that a tmpenc rendering program was recommended, but I want to try using free software or software I already own, and I still want to try and do this without any rerendering, which should be possible if my frames land close enough to where they need to be.

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