Gap between Y and U,V planes when extracting.

[sukithaj]

Hi All,

I was trying to convert YUV file to mp4 using the below command.

ffmpeg -f rawvideo -pix_fmt yuv420p -video_size 640*360 -framerate 25 -i 16778240_16778241.yuv -f mp4 16778240_16778241.mp4

It converted the video but seems YUV planes are not overlapped properly.

[Attachment 63435 - Click to enlarge]

Then I tried to extract planes separately and found there is a black stripe between each plane.

ffplay -vf extractplanes=y -f rawvideo -pixel_format yuv420p -video_size 640x360 -i 16778240_16778241.yuv


[Attachment 63436 - Click to enlarge]


[Attachment 63437 - Click to enlarge]


[Attachment 63438 - Click to enlarge]

Is there a way to detect this stripe and remove it? What may cause this issue?

Thank You!

[pandy]

Perhaps size is different or there some header at the beginning (not so RAW as you think)?

Btw seem one of the chroma planes (U?) is horizontally mirrored when compared to Y and second chroma plane also seem there is an offset between U and V...

[sukithaj]

Hi Pandy,

Perhaps size is different or there some header at the beginning (not so RAW as you think)?

Ok this could be the reason. But, I can assure that size is correct

Btw seem one of the chroma planes (U?) is horizontally mirrored when compared to Y and second chroma plane also seem there is an offset between U and V...

It is not mirrored, I just extracted it from a different timestamp

Yes, I can see the offset between all three planes

Is there a way I can identify and clear these bytes?

[pandy]

Ok this could be the reason. But, I can assure that size is correct

Then some data was lost or there is some error in data alignment

It is not mirrored, I just extracted it from a different timestamp

Don't blame me - this is your responsibility to provide correct information as it will determine answer you get in exchange.

Yes, I can see the offset between all three planes

Is there a way I can identify and clear these bytes?

Crude workaround is to replace all black i.e. "0" by "128" i.e. no color - de-saturate - i.e. only luminance i.e. grayscale will be visible without color artifacts.

[sukithaj]

Hi Pandy,

Thank You for the Reply. Let me check if there is any data loss or data format issue.