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

2022-05-10 Thread 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

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

2022-05-06 Thread Alexander Zhang
Hello, I have an MPEG-2 video which is progressive but marked as interlaced, so video players try to deinterlace it and ruin the quality. Is there a way to fix the interlace flag without re-encoding the video and causing quality loss? Thanks, Alex

Re: [FFmpeg-user] Single-field deinterlace with nnedi

2022-04-30 Thread Alexander Zhang
I'm trying to use nnedi to deinterlace a 29.97 fps video without doubling the frame rate. I added the fields=a option which I thought was supposed to make nnedi only use one of the two fields, but the output is still 59.94 fps. Is this a bug or am I misunderstanding something? Filter still prod

[FFmpeg-user] Single-field deinterlace with nnedi

2022-04-29 Thread Alexander Zhang
Hello, I'm trying to use nnedi to deinterlace a 29.97 fps video without doubling the frame rate. I added the fields=a option which I thought was supposed to make nnedi only use one of the two fields, but the output is still 59.94 fps. Is this a bug or am I misunderstanding something? Here's