[FFmpeg-user] Set MPEG-2 interlace flag without re-encoding

[Alexander Zhang]

On 5/9/22 2:44 AM, Nicolas Gaullier wrote:
> Note that if you reencode, you might consider processing the chroma in between (convert to 4:2:2 back and forth) since the vertical sampling filtering is affected.

What does this mean? I only have basic knowledge of how video 
compression works so I don't understand what you're talking about.

Thanks,
Alex