LE 10 beta for i4 force hdmi resolution

1st Official Post

    I am using my pi 4 to drive my retro-crt TV

    I have the following in config.txt to enforce a 576i resolution.

    The setting is ignored by LE. It just switches to a resolution it has found with the edid from the hdmi <-> vga/rgb converter.

    The crt TV is not happy with a HDresolution :)

    Is this a bug in LE10 or did I overlook something (/lol me stupid)

    Only the "rainbow" boot screen is displayed in 576i.

    hdmi_group=1

    hdmi_mode=22

    hdmi_ignore_edid=0xa5000080

    Hi Chewitt,

    Thanks for the reply.

    I use the HDMI port with a HDMI -> VGA/RGB sync convertor to drive the CRT directly with a proper RGB signal.

    I do not want to use the (crappy) CVBS output.

    How do you enforce the resolution in LE10 with pi4 ?

    Edited once, last by vasonline (August 26, 2021 at 7:58 AM).

    Hi Hiassoft

    Thank you for your reply.

    Added to cmdline.txt

    You would say it works, however

    There seems something wrong with interlaced modes coming from the PI4

    anyone with a pi 4 wants to test that?

    Selecting 576p in Kodi settings -> works.

    Selecting 576i in Kodi settings -> garbage pixelated.

    Selecting 480p in Kodi settings -> works.

    Selecting 480i in Kodi settings-> garbage pixelated.

    Please see attached pictures showing 576i pixellated and 576p normal.

    Please understand that it _need_ interlaced. Otherwise the retro CRT TV doesn't like it.

    Also it's the wrong aspect ratio. I want 16:9, not 4:3

    ( :) difficult me)

    Here is a photo I took on a recent-ish lcd tv to illustratie the picture quality problem.

    The retro crt will not want to give a meaningfull picture with this garbage PQ.

    Thanks for the info!

    I could reproduce the pixelated output issue here and pinged the RPi devs - it looks though as 480i/576i output via HDMI always had this issue on RPi4.

    so long,

    Hias

    Hi,

    I updated the RPi4 to the latest release (10.0.1 / 2021.11)

    Is it possible the fix is not yet included?

    480i and 576i modes are still pixelated. (no change in behavior)

    Mayby I am doing something wrong/forget something?

    Want to test/confirm?

    Greetings/tx

    :) :) Confirm FIXED pixellation problem! :) :)

    Thanks everyone involved for the help!

    This with libreelec 11 on RPI4.

    Just one humble question:

    - How can I set the 16:9 aspect ratio in 576i video mode?

    Because see screenshot, there are two 576i aspect ratio's.

    (16:9 and 4:3)

    The CRT is 16:9, It defaults to 4:3. 4:3 default is okay

    for me, but how to change it?

    - Tried playing with the picture calibration. Some GUI elements are still stretched. Ok for the video.

    It's HDMI mode 22 instead of 21.


    You have to manually switch your CRT to 16:9 mode and use video calibration in kodi to compensate for the stretched / anamorphic display mode.

    so long,

    Hias

    Hi Hias,

    That worked out quite Okay. Got a good 4:3 anamorphic picture. Set TV to Wide, and it is Okay.

    Case closed!

    I did find a minor issue elsewhere. Will make a new topic for that.