FFMPEG: can crop 32 lines using vcodec copy?

[marcorocchini]

Hi cats

please consider this IMX .mxf file (SD)

https://www.dropbox.com/s/5jd9run51moczxh/imx.mxf?dl=0

it's 608x576 with 32 lines upper



I need to pass the video pack, without the 32 upper lines, so that I have a pure 720x576, to put in a mkv container

I wonder: can I cut 32 lines from top using the -vcodec copy option of ffmpeg? ... maybe not

so is there a way to pass in mkv the cropped video without transcoding all the file, or however is there a way to have exactly the same quality in the outputted mkv file?

thanks

[poisondeathray]

Not possible. You cannot crop without re-encoding

[marcorocchini]

so to don't have loss of quality I need to recode in uncompress?

[poisondeathray]

so to don't have loss of quality I need to recode in uncompress?

uncompressed, or a lossless codec

Both will result in much larger filesizes than the original

[newpball]

Since this is TV stuff (the 32 extra lines have to do with brilliance of engineering) and 4:2:2 chances are you would want to reencode this anyway if you want to use this for mkv compatible devices.