[HamWAN PSDR] Recommended settings for IP video on HamWAN

[Tom Hayward]

We built HamWAN to be used. I don't think this application will cause any
problems. If it does, we can always optimize later.

Tom KD7LXL

On Sat, May 2, 2020, 19:03 B.J. Guillot <bj.guillot at gmail.com> wrote:

> I want to make sure I'm being respectful of HamWAN network bandwidth, so
> figure I'd shoot this note out to the group.
>
> Does anyone have suggestions for what video settings I should use for a
> Grandstream GXV3500 streaming device?
>
> Primary video stream options:
>
>    - *Preferred Video Codec*: H264 (or MJPEG)
>    - *Resolution*: D1 704*480 (also lesser resolutions available, but
>    this is already SD quality)
>    - *Bit Rate*: 1024 kbps (lower options are 768, 512, 384, 256, 128,
>    64, 32, 16)
>    - *Maximum Frame Rate*: 30 fps (other options are 25, 20, 15, 13, 10,
>    5, 4, 3, 2, 1)
>    - *Bit Rate Control*: CBR (constant bit rate) or VBR (variable bit
>    rate) -- the default in CBR, but I figure this should probably be VBR for
>    HamWAN, happy to hear opinions
>    - *I-frame Interval*: 50 (choose between 1-100)
>
> Purpose of what I'm trying to do:
>
> The local Amateur TV net has a group of people using Grandstream devices
> to send video to the repeater for those of us who are not in a good
> position to transmit RF to it.  Grandstream users are starting to outnumber
> users capable to sending video RF, so I'm looking to find a way to make it
> still feel like it's "ham radio" for those of us sending video over the
> Internet.  Utilizing HamWAN to do this feels like a way to keep the ham
> radio spirit alive in ATV.  If you can't point your 70 cm yagi at the ATV
> tower and send NTSC because of your location, at least you can point a dish
> at a HamWAN sector and send the IP video that way since there are more
> sector locations to pick from and we're still using a 5.9 GHz amateur radio
> frequency to do it.
>
> I can power-down the Grandbox box when I'm not using it (nets are only 2
> hours a week), so I don't think the network load will be high, but there's
> always the possibility I might forget to disconnect the power, and I don't
> want to waste X kbps of bandwidth if there's a way to utilize less in the
> event of an error.
>
> The box uses RTSP, which I believe is not encrypted, so should be "legal"
> for HamWAN according to what I know.  If this is not the case, please let
> me know ASAP.  I'm connecting into the SnoDEM/Paine sector.  I don't have a
> clear line of sight and typical bandwidth is only about 1 Mbps (sometimes a
> little less; sometimes with packet loss), though on one or two occasions
> when the stars aligned I managed to get 3 Mbps.
>
> More info on the local ATV net: http://bgfax.com/atv
>
> Regards,
> Burt Guillot - N7CS
> Marysville
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>
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