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Can jpegxl_decode decode multiple frames? #32

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JackKelly opened this issue Feb 11, 2022 · 5 comments
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Can jpegxl_decode decode multiple frames? #32

JackKelly opened this issue Feb 11, 2022 · 5 comments
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enhancement New feature or request

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@JackKelly
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Thanks again for all your work on imagecodecs!

Can jpegxl_decode decode multiple frames?

If I've understood correctly, jpegxl_encode can encode multiple frames (in this loop). But I don't think jpegxl_decode can decode multiple frames yet? Or have I missed something? 🙂
@JackKelly JackKelly mentioned this issue Feb 11, 2022
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@cgohlke
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cgohlke commented Feb 12, 2022

It's on the TODO list:

imagecodecs/imagecodecs/_jpegxl.pyx

Line 517 in ddddb7b

# TODO: handle animations

There seem to be no API to obtain the number of frames other than decoding all frames and counting...

@cgohlke cgohlke closed this as completed Feb 12, 2022
@JackKelly
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Cool, thank you!

There seem to be no API to obtain the number of frames other than decoding all frames

To be honest, that's fine for me. For my use-case, I'll always want to decode all the frames. So it would be great to be able to get all the frames back in one call to imagecodecs.

Thanks again for all your work on this!

@cgohlke
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cgohlke commented Feb 14, 2022

For reference: Questions about animated sequences.

@cgohlke
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cgohlke commented Feb 16, 2022

I got the decoding of JXL animations working with libjxl 0.6. The necessary API for encoding animations will be available in the next major release of libjxl (libjxl/libjxl#909).

@JackKelly
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Oooh, that's super-cool, thank you!

@JackKelly JackKelly mentioned this issue Feb 16, 2022
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@cgohlke cgohlke added the enhancement New feature or request label Mar 3, 2022
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@JackKelly @cgohlke