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Use reduced_still_picture_header when still_picture flag is set #1000

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tdaede opened this issue Feb 14, 2019 · 3 comments
Open

Use reduced_still_picture_header when still_picture flag is set #1000

tdaede opened this issue Feb 14, 2019 · 3 comments

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@tdaede
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@tdaede tdaede commented Feb 14, 2019

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@rzumer

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@rzumer rzumer commented Jul 26, 2019

#1498 implements necessary header changes, but we need to implement disable_frame_end_update_cdf before we can enable the reduced header in the Sequence constructor.

@barrbrain barrbrain added this to To do in Release 0.2 via automation Nov 26, 2019
@cryptomilk

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@cryptomilk cryptomilk commented Nov 26, 2019

I've just enabled still_picture in libavif and the encoded picture then can't be decoded by dav1d.

cryptomilk added a commit to cryptomilk/libavif that referenced this issue Nov 26, 2019
This is not fully supported in rav1e yet:
xiph/rav1e#1000
@barrbrain

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@barrbrain barrbrain commented Nov 26, 2019

From AV1 Image File Format (AVIF), 2.1 AV1 Image Item:

  • The AV1 Image Item Data should have its still_picture flag set to 1.
  • The AV1 Image Item Data should have its reduced_still_picture_header flag set to 1.

This issue impacts producing typical sequences for libavif. Emphasis added above.

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