Usage with raw data about yuvio

[labradon]

Great, thanks for the input! I just pushed an updated version and uploaded it to PyPI that is able to do what you are referring to.

It turned out that there was still a problem with interleaved formats and the YUVFrame container, I fixed that. Solving your problem then was quite straightforward by allowing to read and write not only to/from file objects but arbitrary io streams. By wrapping the in-memory data with io.BytesIO, de-interleaving can be performed using imread.

import io
import yuvio

rawdata = [...]  # np.ndarray
f = yuvio.imread(io.BytesIO(rawdata), width, height, format="uyvy422")
f.y   # returns just the Y plane

The only additional information that is required is the resolution of the Y plane (width, height).

[labradon]

Great to hear that the library can be useful to others as well.

Do I understand correctly that you'd like the functionality to

1. separate the individual yuv planes from an interleaved format
2. perform automatic chroma channel sub-/upsampling depending on the source and target subsampling format?

The first functionality is something that I've thought about as well for a while. Hearing that it might be useful for more people than just me could make it worth implementing. I'll give it a go.

The second functionality is something I haven't thought about yet, but definitely sounds useful. Would you like to have a "security" argument like chroma_resampling_ok that is False by default to prevent accidental resampling?

[slhck]

Yes, the first functionality is what I was referring to.

To give you a bit more background: we are getting pixels in packed/interleaved format and need just the Y plane to do some calculations. Originally I thought I could use PyAV' grey conversion, which it does through FFmpeg, but I believe it does a weighting of the Y/U/V components. So this is not working either. My fallback was to use frame.planes[0], but this does not work for packed formats like UYVY.

Since our use case is just handling UYVY as the (probably) second most common non-YUV format, resampling hadn't occurred to me. So, automatic sub-/upsampling is a bit more challening, and having just the former would be nice, like:

rawdata = […] # np.ndarray
f = yuvio.frame(rawdata, format = "uyvy422")
f.y # returns just the Y plane

[slhck]

That's great, thank you! I will try to implement this over the coming days.