Dimension cropping?

[Anonanon]

I know you want this program to be as simple as possible, but I would recommend an option to set offsets for top, left, right, bottom to crop out. There are a lot of WebMs out there that could use a cropping feature to get rid of letterboxing. For example, all but one of Diablo III's cinematics have letterboxing baked in for some reason.

Of course the terminology here clashes with time cropping so I'd suggest renaming time cropping to "Start trim" and "End trim". Dimensions would become "Top crop" etc. measured in pixels.

Thanks for your continued updates to this program.

[Teapsalm]

This would be a good feature for reaction WebMs.

[WebMBro]

I'll see what I can do. I'll be a bit busy with other stuff tomorrow though, so I'll only be able to work on this in the weekend.

[WebMBro]

I might, in fact, try to make a graphical representation of the cropping area to make it easy to use. This would require the user to fill in both the width and the height field of the resize option, though.

[rmmh]

ffmpeg has a -vf cropdetect filter that find black bars and outputs crop parameters. An 'autocrop' checkbox would fit better with the 'webm for retards' theme.

[nixxquality]

I agree with rmmh. Keeping it simple is a good idea.
If you need more control than that, you can use the avisynth support present in ffmpeg.

[Anonanon]

Auto crop is good too

[WebMBro]

I've been working on this a bit, the gui looks like this so far, any complaints?

[WebMBro]

Okay, try the newest release, it should be sort of working now.

[omgorf]

It's good for cropping a section out while keeping the original size of what you are cropping out but say you want to crop an area and scale that down. Would there be a way to put the scale after the crop and maybe even calculate a corrected value when using the cropping feature.

For example I want to crop a section out of a 720p video, at full resolution this is 606x720 but I want to resize this down to 400:475. Now when I select the region of 606x720 I'll get -filter:v crop="606:720:70:0" which is great but as it's just a face being so large doesn't suit it so good so when you select the 606x720 area with the crop selector you could instead use -vf crop=606:720:70:0,scale=606:720 and fill in 606x720 on the resolution field. further changing of the resolution field will now also affect the scale after the crop and allow the use of -1 for keeping aspect ratio. So If I want to crop that section and then resize it I could use vf crop=606:720:70:0,scale=400:-1 Where I changed the main resolution field to 400 and -1. Maybe also only add the scale after the crop if the resolution is changed but I'm not sure if you'd be able to easily detect that.