Cropping, resizing, resampling and file size

Gingko

Member
Hello,

VideoRedo is a great application for editing files while keeping file format and original quality.
But much less when you need video recode, especially when cropping and resizing.

I just tried to convert an old MPEG2 widescreen movie recording encoded in 4:3 aspect ratio to H264 16:9 by cropping and resizing, and found it is very very hard to chose a recoding method giving the optimal quality regarding to the source one.
Whatever settings I choose tends to creates a H264 which has twice the size of the original MPEG2 file, which is not very much the point of converting MPEG2 to H264 (I would have expected something like half the size, not twice, with equal level of quality).
Would it be possible, while choosing settings, to give a reasonable preview of what will be the resulting file size before starting the conversion?

Regards,
Gingko
 

Dan203

Senior Developer
Staff member
Set the codec to H.264. Set the mode to Intelligent. Set the aspect to 16:9. Set aspect correction to crop. Set the resolution to 720x405.
 

Gingko

Member
Set the codec to H.264. Set the mode to Intelligent. Set the aspect to 16:9. Set aspect correction to crop. Set the resolution to 720x405.
Thank you very much, that sounds better (although some interface simplification would help a little … and that I can't set the resolution to 720x405. I can do 720x404 or 720x408).

But it could be better again, as I actually also want to remove some side margin (14 pixels on left and right) in this video. Don't ask me why they are there.
I can do this using manual cropping, but this is very hard without breaking the aspect ratio: also removing 8 pixels on top and bottom seems to be the best approximation, but this needs not obvious calculation.
Would it be possible to include, for example, a zoom factor (with tiny steps) into this section as an alternate method?

Gingko
 

Dan203

Senior Developer
Staff member
You can manually crop instead. Forget about aspect correction and click the Crop button instead. Set the cropping how you want and then check the box that says set resolution to cropped size.
 

Gingko

Member
You can manually crop instead. Forget about aspect correction and click the Crop button instead. Set the cropping how you want and then check the box that says set resolution to cropped size.
I just tried it.
But I'm sorry … If I get into "Cropping and resizing" (there is no "Crop" button) and crop the video by any value, whatever I set "Set resolution to cropped size" or not and even "Maintain aspect ratio" or not, I don't get the proper aspect ratio.
The actual cropping seems even unpredictable as the aspect of the small preview and its initial stretching seems to depend on parameters which are not all selectable inside this section.
Getting what I want seems to be so much hazardous and complicated that I give up most of the time.

Gingko
 

Dan203

Senior Developer
Staff member
I just tried it.
But I'm sorry … If I get into "Cropping and resizing" (there is no "Crop" button) and crop the video by any value, whatever I set "Set resolution to cropped size" or not and even "Maintain aspect ratio" or not, I don't get the proper aspect ratio.
The actual cropping seems even unpredictable as the aspect of the small preview and its initial stretching seems to depend on parameters which are not all selectable inside this section.
Getting what I want seems to be so much hazardous and complicated that I give up most of the time.

Gingko
Honestly I'm not sure what you're doing wrong. There are some presets in the drop down, maybe start there. Start with the "Letterbox to Widescreen" option. That should crop to just the video like you want. Then adjust as needed to take off whatever you want from the left/right.

Just to make sure something wasn't broken I just tried this myself and it worked exactly as expected. I opened a letterboxed video, set the aspect to 16:9, picked the "letterbox to widescreen" preset, adjusted the left and right a little manually, and selected "set resolution to cropped size" and the output was exactly as expected. The file wasn't 1/2 the size of the original, but it was about 30% smaller. If you want to be more aggressive about the size you can adjust the ratios in the Advanced section or you can just set the output to Force Recode and manually set the bitrate.
 
Top Bottom