RF HDTV Modulator for DVHS VCR with built in ATSC tuner - Page 4 - AVS Forum
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post #91 of 94 Old 07-28-2014, 11:39 AM
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That's not an issue. I guess I'll go see how much change is in the console of my car and in the couch cushions. This looks like a really inexpensive project!


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post #92 of 94 Old 07-29-2014, 09:29 PM
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Just a quick update... using sox, FFmpeg and OpenCaster, I'm getting closer to being able to generate a test pattern that'll be ATSC compliant. When playing through the card, it doesn't seem to get broadcast but that might be due to some PIDs that I have that I shouldn't.

Here's a screen shot of what TSReader sees...

Still have some testing to do but once I hammer out the loose ends, hopefully I'll have something that I can use to pump out valid data.

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post #93 of 94 Old 08-01-2014, 05:32 AM
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Hi All,

So I managed to create a test pattern with a 400Hz test tone and got it playing properly through all my TVs. For those that are curious, I'm using the following under Ubuntu 14.

- sox for generating audio tone
- ffmpeg for creating audio and video elementary stream (AC3 stereo and mpeg2video)
- opencaster 3.2.2 for converting and muxing the elementary streams

I'll refine my bash script a bit and post it if others are curious.

My TS specs are:
Audio: AC3 2 channel at 48KHz and 192k bitrate
Video: MPEG-2 1080i at 7Mbps
Muxed Data:PAT, PMT, MGT, TVCT

Right now, I just use the HDTV998 program to play my generated ATSC transport stream and it's all good!

Next is to see if I can do live stuff and use the existing program to send it to the card, if that works, there's no need to develop new software.


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post #94 of 94 Old 08-27-2014, 11:52 AM
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Do you have the whole thing working under Linux or are you just generating the video files under there?

I'm very interested in those undocumented functions and would also love to see your BASH script. I'm also really curious how you found all the undocumented functions...
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