[mythtv-users] Minimizing bandwidth with MPEG-4

[Len Tucker]

What you are trying to accomplish is going to be very difficult over the internet. Mythtv is designed to run over a LAN and from what I can tell doesnt buffer on the client side. You are going to have jitter over the internet that will not be tolerated within MythTv. This will lead to dropped packets and the pauses or choppiness you will recieve while watchining TV over the Internet. Even if you drop your data rate to 128kbps you will still have intermitent pauses. What would need to be done is setting up a buffer for the stream then playing the buffered file.



----- Original Message -----
From: Andy Kuan <andy at kuan.net>
Date: Wed, 31 Mar 2004 10:52:38 -0500
To: mythtv-users at mythtv.org
Subject: [mythtv-users] Minimizing bandwidth with MPEG-4

> I've been trying to come up with encoder settings for MPEG-4 that 
> provide the lowest possible bandwidth utilization. This is in the hopes 
> of being able to watch (grainy) TV on my desktop at work. It _almost_ 
> runs smoothly for me right now.
> 
> My current settings are 160x160 MPEG-4 at 100kbps, max qual 2, min qual 
> 15, qual diff 3, 4MV and hi-qual checked, MP3 sampled at 32000 at a 
> quality of 9. These settings will produce a 50M file for a 30 minute 
> show. That's around 200kbps which is 2/3 of the upstream capacity on my 
> cable modem (which makes me wonder why it isn't 100kbps as set -- ah 
> well). I tried watching some baseball from the office yesterday and 
> experienced momentary drop outs (~1-2 sec) every 10 seconds or so -- so 
> I know I'm close. I figure I'll never get the full 300kbps upstream from 
> my cable modem, so my target should be around 150kbps for my encoding 
> settings.
> 
> I don't believe the 4MV and hi-qual MPEG-4 settings will make a 
> difference. That leaves changes to the max qual, min qual, and qual diff 
> settings for MPEG-4 and the audio settings. Unfortunately I haven't seen 
> any documentation whatsoever on how to adjust those MPEG-4 quality 
> settings (except for warnings _not_ to touch the settings) and there 
> isn't a control to alter the bitrate of the MP3 audio.
> 
> Has anyone else attempted this or have any suggestions? Thanks!

>
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> mythtv-users at mythtv.org
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