support Apple 64-bit ARGB ('b64a')

[v0lt]

I made AVI file in VirtualDub Filter Mod version 10. But it does not play in ffplay.exe.

​b64a.avi
​VirtualDub Filter Mod

FOURCC 'b64a' referred to in the following links:
​https://wiki.multimedia.cx/index.php?title=QuickTime_container
​https://wiki.multimedia.cx/?title=SheerVideo
​https://wiki.multimedia.cx/index.php?title=Apple_ProRes

[Carl Eugen Hoyos]

Which player plays the sample you provided?

[v0lt]

Quick Time Player 7.7.9

[Carl Eugen Hoyos]

The QuickTime 7 player I have here refuses to play any avi files, how do you test?

[ami_stuff]

I can confirm that this file decodes correctly with QT 7.6 on Win.

[v0lt]

Replying to cehoyos:

The QuickTime 7 player I have here refuses to play any avi files, how do you test?

I ran Quick Time Player 7.7.9 and pulled the file in the player window. The file is played correctly.
​http://i.imgur.com/Kf3xs5M.jpg

[Carl Eugen Hoyos]

This either needs a (trivial) codec or a new colourspace in libswscale.

[v0lt]

I think there packet ARGB64BE format. If swap all the bytes of the pixel, we get AV_PIX_FMT_BGRA64LE.

[v0lt]

Or change the position of the alpha channel, then we get AV_PIX_FMT_RGBA64BE.

// ARGB64BE -> AV_PIX_FMT_RGBA64BE
uint64_t pixel = ...;
pixel = pixel << 48 | pixel >> 16;

[Carl Eugen Hoyos]

I just sent your patch to the development mailing list, in the future please prepare your patches with git format-patch and send them to ffmpeg-devel, patches are generally ignored on this bug tracker.

[Arnaud]

I also think they packaged as ARGB64BE indeed.

I'm not sure what the patch proposed is doing exactly, but it seems like it interprets AV_PIX_FMT_RGBA64BE as ARGBBE when codec is b64a.
Wouldn't it make more sense to add a new AV_PIX_FMT_ARGB64BE pixel format?
To also allow conversion from/to this format for example.
But this would probably requires more work to fully support it everywhere..

[Carl Eugen Hoyos]

Should be fixed in ceab04fb5db89052b3d8abcb57b137de24ed42b0