LE 10 beta for i4 force hdmi resolution

  • 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.