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Re: [Discuss-gnuradio] Analog video modulation.

From: Ron Economos
Subject: Re: [Discuss-gnuradio] Analog video modulation.
Date: Wed, 16 Jul 2014 22:07:44 -0700
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20120306 Thunderbird/3.1.20

All video decoders use the YCbCr colorspace. You'll need
to convert that to YIQ for NTSC.

You can create a YCbCr file with vlc.

vlc -I rc <file to decode> -V yuv --yuv-file=<output file> --yuv=chroma=UYVY

This will create a YCbCr file with 4:2:2 chroma in the format
Cb Y Cr Y Cb Y Cr Y .......

vlc does put a header and frame markers in the file. I don't know
if that can be disabled.

YCbCr files only contain the active video (720x480 for NTSC). You'll
have to create and insert the vertical and horizontal blanking.


On 7/16/2014 6:50 PM, Jordan Johnson wrote:
After finishing my AM Stereo transmitter, I have decided to build an NTSC modulator. I think I have the actually modulation and filter blocks down, I just need to firgure out how to get the right signals from a digital video file. The file source wouldn't work; I would probably have to use gstreamer. Anyone know exactly what I'm looking for and how to get it? I need brightness, hue, saturation, and I believe that is it.

- Jordan

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