Unchecked. Also, the "Quality" slider was at Medium and the Key frame box
was checked with every 75 frames (for 15fps content).
Colin Witt
Manager, Internet Communications
Baylor University
254.710.6270
email@hidden
http://www.baylor.edu
> From: George Cook <email@hidden>
> Date: Thu, 26 Oct 2006 15:47:55 -0400
> To: Colin_Witt <email@hidden>
> Cc: <email@hidden>
> Subject: Re: QuickTime Broadcaster data rate
>
> Colin:
>
> Did you have the frame reordering box checked or unchecked? I highly
> recommend disabling frame reordering for live streams.
>
> -George
>
> On Oct 26, 2006, at 3:14 PM, Colin_Witt wrote:
>
>> This past weekend we streamed our Homecoming Parade on the
>> Internet, not
>> using QTSS directly but through our Akamai contract. We used QuickTime
>> Broadcaster (as well as Helix Producer) to produce a live stream
>> in .mov and
>> .rm format.
>>
>> This was our first live event since we got our new MacBook Pro, so we
>> decided to stream using the H.264 video codec and AAC audio. Our
>> target
>> bitrate was around 350kbps, and I setup the QTB settings to use a
>> data rate
>> of 64kbps audio (mono) and to limit the video data to 250kbps. We
>> used a
>> frame size of 320x240 and streamed at 15 fps.
>>
>> What happened during the event was the encoder was all over the map
>> with
>> regard to video data rate. It would sometimes go as high as
>> 230kbps, and the
>> stream would look very good. Then for long periods it would drop
>> down in the
>> 50-80kbps range, and things would look pretty bad. CPU load never
>> went above
>> about 45% (each core), and the frame rate was pretty consistent
>> around 14-15
>> fps. It seems as though the data limit in QTB doesn't really
>> function as a
>> "target data rate" as much as a true limit.
>>
>> Anybody have insights into how we could truly achieve a target data
>> rate in
>> the 250kbps range? It really looked quite good when we got those
>> peaks,
>> compared to the Real stream.
>>
>> Colin Witt
>> Manager, Internet Communications
>> Baylor University
>> 254.710.6270
>> email@hidden
>> http://www.baylor.edu
>>
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