How to get "display" width and height for anamorphic videos?

[romaincointepas]

onFrameSetup returns width and height that should not be used to calculate the dimensions/ratio of the canvas for anamorphic videos (aka non-square pixels).

I thought the pixelFormat argument was here to help (by giving the pixel ratio, the equivalent of sample_aspect_ratio when using ffprobe), but it seems to always return 1 even for anamorphic videos.

This can be easily reproduced with the following video: https://mega.nz/#!cwZUiCTA!oP0RUNe93M-qsUDGxhG-hjJV6WU20oo2a9y9zt2frUQ

• ffprobe returns

  width: 720 height: 480 sample_aspect_ratio: 32:27

• onFrameSetup returns

  width: 720 height: 480 pixelFormat: 1

• VLC (the native app) will resize the app to the following dimensions

  width: 853 (which is round(720 * ( 32 / 27 ))) height: 480

VLC itself being able to size anamorphic videos correctly, I assume that either there is a bug with pixelFormat that shouldn't be returning 1, or another argument may be added to handle correct sizing of anamorphic videos.

My personal suggestion would be that because WebChimera.js is meant to be used in a HTML environment, width and height should directly be converted to "display" dimensions to be directly used to size the canvas and pixelFormat should be removed. (In the above example, width and height would then be 853x480).

Any thoughts?

[RSATom]

It's known issue of libvlc's vmem plugin. There are just no way to get pixel aspect ratio from libvlc. It could be solved by custom plugin - something like vmem2, but unfortunately I can't find time to finish it.

[RSATom]

pixelFormat is just enum which could be VlcPlayer.RV32 (= 0) or VlcPlayer.I420 (= 1)

[romaincointepas]

@RSATom Got it, thanks! Do you know if libvlc 3.0 will make this possible without a custom plugin?

[RSATom]

Don't think so. Only if somebody will finish vmem2 (or something similar) and will send patch to videolan team.

[RSATom]

Closed as too old.