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I concur. Export with H.264, using the YouTube preset.
thank you. The problem is that it is now still not fully widescreen - see www.youtube.com/watch?v=A6GIoOCyGCg. I think I am just doing something stupid. The format for the saved file is...
Is there something I should be doing to the clip before I export, to have it fill the whole of the screen on youtube? You can see here how it is set up in premiere...
Source is SD, output is full HD. That is a clear recipe for lousy quality. First make sure your sequence settings match exactly what you shot. Possibly use File/New/Sequence from Clip, after having selected one of your clips in the project panel. Then don't uprez and export with the YouTube preset.
thank you for your help Harm. I really appreciate it.
I will look into your suggestion tomorrow (I am on UK time here).
I don't get why my source is SD rater than HD, given the spec. I mentioned originally, and how youtube says the good clip is HD. What am I missing here?
In your initial post, you state:
They both started out as identical format [1920x1080, 14005kbps data rate, 14133kbps total bitrate, 50 frames/second) MP4 files;
If that is correct, then you ARE starting out with full-HD material, and that should be a PAR = 1.0 (Square Pixels) and 16:9 Aspect Ratio. Outputting to 1920 x 1080, should yield 16:9 with Square Pixels, as well.
Now, one of your output tests WAS to SD, and you state:
the poor output is a (720x576, 28807kbps data rate, 30343kbps total bitrate, 25fps) “Video Clip”.
but there is no mention of that output file's PAR, so it could be 4:3, or 16:9. The down-rezzed Export file WILL not look as good as full HD output to full HD.
I think that that latter 720 x 576 confused Harm, or maybe I am the one, who is confused?
Thank you both for your generous help.
In the end I started again from the original and the result is now just fine at http://www.youtube.com/watch?v=RGgew1316xw.
I don't know why I had the problems that I had, but the whole process was very educational nonetheless.
The export settings does not look at your source footage, it looks at your sequence settings.
Which might have been 1920x1080 footage in a 720x576 sequence and not noticable when having Default Scale to Frame Size in the Preferences set to ON.