muddy9069
Posts: 2
Joined: Tue Apr 23, 2019 3:21 pm

Need to output 720x480i @ 29.97hz

Tue Apr 23, 2019 3:34 pm

Hello,

I have been reading for days and I can not seem to figure this out. I have a need to be able to output from HDMI at 720x480 16x9 interlaced at 29.97hz for specific hardware to see the output. I have tried tvservice with the ntsc option and can get 59.94 at the correct resolution but all the CEA modes are 50hz and higher. Anyone have any idea how to do this or if it's even possible??

I am on an rpi3b+ with minibian installed and using OMX player to output the video..

Thanks
Scott

jamesh
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
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Re: Need to output 720x480i @ 29.97hz

Tue Apr 23, 2019 3:45 pm

Principal Software Engineer at Raspberry Pi (Trading) Ltd.
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muddy9069
Posts: 2
Joined: Tue Apr 23, 2019 3:21 pm

Re: Need to output 720x480i @ 29.97hz

Tue Apr 23, 2019 4:06 pm

Jamesh,

I have read through both of those.. something I am missing but I cant seem to get the HDMI_timings to do anything. I put in different resolution and just get 1920x1080 at 60hz (default I believe for my monitor) HDMI_CVT or HDMI_timings dont seem to work for me. Using tvservice is the only way so far I have gotten anything other then 60hz to work.

Scott

jamesh
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 22754
Joined: Sat Jul 30, 2011 7:41 pm

Re: Need to output 720x480i @ 29.97hz

Tue Apr 23, 2019 9:29 pm

Are you setting the custom hdmi mode correctly to use the custom settings? Cannot remember exactly what the rune is offhand, but think its in that config doc.
Principal Software Engineer at Raspberry Pi (Trading) Ltd.
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