On Mon, Aug 30, 2010 at 2:07 PM, Dan Dennedy <[email protected]> wrote: > On Mon, Aug 30, 2010 at 11:23 AM, Dan Dennedy <[email protected]> wrote: >> On Mon, Aug 30, 2010 at 8:59 AM, Simon A. Eugster <[email protected]> wrote: >>> As the Canon EOS 550D is recording with 1088 px height. >> >> Note to self: avoid purchasing a camera that does this! >> >>> When using 1080p as project profile, black borders are created on the >>> left/right of the video (scaled down to 1080). So one option is to add a >>> Crop effect to every single clip in the timeline and cutting off 8 px from >>> the bottom (or the top). >> >> I wonder if it makes sense at all to change the pixel aspect ratio? I >> think that is a little more convenient than crop on each clip. > > No, bad idea. From a little analysis, I see that 1088 is used because > it is an integral number of macroblocks (68*16 = 1088). AVCHD and > similar contain crop information in the H.264 parameter sets. However, > on the Canon EOS cameras, the sequence parameters sets contain 0 for > the cropping fields. There might be signaling elsewhere that ffmpeg > does not understand because interestingly Quicktime shows it as 1080 > (VLC as 1088). Or, Quicktime may have baked in some heuristic, which > is what I am considering. The logic would very constrained: if no > override, height is 1088, and project aspect ratio is 16:9 crop 8 rows > from the bottom.
I attached a patch that does this. Give it a try. -- +-DRD-+
1088to1080.diff
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