2014-06-26, 00:06
I've just noticed from a debug log on Pi that the following JPEGs are progressive:
system.jpg
playdisc.jpg
tv.jpg
skinsetting.jpg
music.jpg
custom.jpg
music_small.jpg
favourites.jpg
pictures.jpg
settings.jpg
addons.jpg
programs.jpg
shutdown.jpg
videos.jpg
appearance.jpg
logoff.jpg
HDmovies.jpg
missing.jpg
amt.jpg
network.jpg
weather.jpg
fanart.jpg
These one are okay
tvshows.jpg
movies.jpg
fanart.jpg
Why is this an issue? Progressive jpegs will always be slower to decode than non-progressive, and cannot be hardware decoded.
Progressive jpegs were designed for gradual display over slow dial-up modem links, and aren't really suitable for xbmc.
This makes NEON unusable on Pi which relies on hardware JPEG decode.
Can I suggest you change to non-progressive jpegs?
You can check is a jpeg is progressive here
You can convert progressive jpeg to non-progressive losslessly with jpegtran
system.jpg
playdisc.jpg
tv.jpg
skinsetting.jpg
music.jpg
custom.jpg
music_small.jpg
favourites.jpg
pictures.jpg
settings.jpg
addons.jpg
programs.jpg
shutdown.jpg
videos.jpg
appearance.jpg
logoff.jpg
HDmovies.jpg
missing.jpg
amt.jpg
network.jpg
weather.jpg
fanart.jpg
These one are okay
tvshows.jpg
movies.jpg
fanart.jpg
Why is this an issue? Progressive jpegs will always be slower to decode than non-progressive, and cannot be hardware decoded.
Progressive jpegs were designed for gradual display over slow dial-up modem links, and aren't really suitable for xbmc.
This makes NEON unusable on Pi which relies on hardware JPEG decode.
Can I suggest you change to non-progressive jpegs?
You can check is a jpeg is progressive here
You can convert progressive jpeg to non-progressive losslessly with jpegtran