View Full Version : Help - Broadcast Standards from Comcast!


Sam Renkin
June 23rd, 2011, 08:04 PM
I could really use some help as I've been beating my head on the desk for a full day. I'm a videographer and Vegas Pro 9d user. I shot and edited a 30-second spot for a client who has signed a contract with the regional Comcast office to air the spot starting on Saturday. I need to upload the file to their FTP site, but the rendering guidelines they've provided don't seem to match any of the render settings in Vegas. From Comcast:

HD Resolution options: 1080i = 1920 X 1080 @ 29.97 frames/sec. 720p = 1280x720 @ 59.94 frames/sec
Codecs: MPEG-2 Transport Stream, Apple ProRes 422, Avid DNxHD 145 (8bit), H.264
Interlacing: All 1080i should be upper/top field first; All 720p should be progressive.
Chroma: 4:2:2
Audio Sample Rate: 48 KHz, 16bit, dual channel audio,
Bit rate: 45 Mbs – lower bit rates may result in poor quality.

They're expecting a Quicktime file size between 400-600MB, and an MPEG-2 file size between 40-150MB.

I shot with my Sony Z5 in 1080/30p mode. I can render the file in a variety of formats, but none seem to offer a 45Mbs constant bit rate or an option to take the frame rate to 59.94. I know the differences between MOV, MP4 and MPEG-2, but I don't know if AVC/MP4 is equivalent to H.264?

If you have experience with these settings, please let me know - I need to resolve quickly! Thanks -

Sam

Leslie Wand
June 23rd, 2011, 10:12 PM
Avid DNxHD - free download.

Bill Grant
June 23rd, 2011, 10:43 PM
Sam you just manually set your settings. The High bitrate is manually set in the preset itself. For our local CBS affiliate, I have to use a H.264 instead of quicktime because their system doesn't like my quicktime. It's all a process.
Bill

Jerry Amende
June 24th, 2011, 02:34 PM
Avid DNxHD - free download.

Just to save Google search, here's the URL: Avid - Avid QuickTime Codecs LE 2.3.4 Download (http://avid.custkb.com/avid/app/selfservice/search.jsp?DocId=392959)

...Jerry

Sam Renkin
June 26th, 2011, 04:06 PM
Leslie and Jerry, thanks for recommending the codecs from Avid, and I feel silly for asking this question: how do I integrate that into my Vegas workflow? Thanks again -

Sam

Jerry Amende
June 26th, 2011, 05:35 PM
Sam,

See if this helps. First, download & install the codec. Then configure a template as shown in the attached image. Save the template and render.

...Jerry

Sam Renkin
June 27th, 2011, 10:01 AM
Thanks Jerry! I'm on it now.