Half D1 352x576, what is this?

	Half D1 352x576, what is this? by Nico Jones on Jul 29, 2008 at 4:38:33 pm Hello there, I need to deliver an AE project in Pal Half D1 352x576 resolution as an mpeg 2. I'll be honest, I've never heard of this res. Obviously putting 352x576 in as a comp size with square pix looks odd, as it says on the spec sheet I got that the video should be widescreen when it's done. What is half D1 res? What's the workflow? Is there a pixel aspect thing I should be aware of? Many thanks, nj Respond to this post   •   Return to posts index

	Re: Half D1 352x576, what is this? by Dave LaRonde on Jul 29, 2008 at 5:00:50 pm I think it's time to ask your contact, "What the heck are you talking about?" I've never heard of it either, and it sounds like something they made up, to be truthful. Besides, I don't think MPEG2 compression will allow you to make anything BUT 720x576 in PAL. Dave LaRonde Sr. Promotion Producer KCRG-TV (ABC) Cedar Rapids, IA Respond to this post   •   Return to posts index

	Re: Half D1 352x576, what is this? by Ray Apokal on Jul 29, 2008 at 9:00:52 pm Nico, Half D1 is a real resolution, It's rare but real. Don't ask your contact 'what the heck they are talking about' just yet. What program are you using to compress these files into a mpeg2? LR Apokal Respond to this post   •   Return to posts index

	Re: Half D1 352x576, what is this? by Dave LaRonde on Jul 29, 2008 at 9:41:16 pm [Ray Apokal] "Half D1 is a real resolution, It's rare but real" Thanks for the correction. Dave LaRonde Sr. Promotion Producer KCRG-TV (ABC) Cedar Rapids, IA Respond to this post   •   Return to posts index

	Re: Half D1 352x576, what is this? by Ray Apokal on Jul 30, 2008 at 12:40:14 am The idea is to get more video onto a DVD by taking half the horizontal resolution. I know it sounds horrible, but I think it was a workflow that was created for single-layer DVD constraints. It was awhile ago that I worked on it, but my workflow was: AE--> Final Cut -->Compressor -->DVD SP In AE and FCP I worked in D1 720x486. I kept the pixel ratio to the typical NTSC .9. It wasn't until I got to Compressor that I changed the resolution to Half D1 352x480 for NTSC. When I brought it into DVDSP it stretched it back. Nico, I would do a quick test to make sure your aspect ratio in your square pixel workflow works. Also, I'm confused that they would want widescreen in an SD resolution. Do they want a letterbox? LR Apokal Respond to this post   •   Return to posts index

	Re: Half D1 352x576, what is this? by Nico Jones on Jul 30, 2008 at 8:47:36 am Hi guys thanks for the help. Well, here is the full spec sheet... Audio Bitrate (Kbps) 192 Type MPEG1 Layer 2 SampleRate (KHz) 48 Number of Channels 2 Video Colour System PAL Picture Mode Non Interlaced ( progressive ) Bitrate – VBR min, average, max (Mbps) N/A Bitrate – CBR (Mbps) 4 Resolution Half D1 352x576 GOP Structure: IBBP Closed or Open GOP OPEN Scene Change Detection YES Closed Captions N/A MPEG 1,2 or 4 MPEG 2 Stream Stream Type MPEG2 TRANSPORT STREAM PIDS : PMT/PCR/Video/Audio pmt:500,pcr:3FE,video:3FE,audio:3FF Filesize segmentation Unlimited Media Format mpg And is does specify 'the video needs to be widescreen' in the email I got. The video, apparently, needs to fit in to the box I've outlined in red here... So Ray, if I have this right, the suggested workflow will leave me with a 4:3 file? Hmmmm. I guess they must mean letterboxed. I tried the workflow, but can't get compressor to output at that resolution and there are no presets...how did you get it to work??? It also needs to have audio in the final MPEG2 file, which is what I'll be supplying them with... Thanks chaps Nico J BB Respond to this post   •   Return to posts index

	Re: Half D1 352x576, what is this? by Ray Apokal on Jul 30, 2008 at 3:28:21 pm Nico, Ah, I see...because it's a video-box it wouldnt matter the aspect ratio (letterboxing). I assumed you were creating a full screen video. This will be a little tricky (but very simple) in Compressor: What you'll have to do is create the custom Mpeg2 with the settings they provided minus the Half D1 resolution (yes, you're forced to keep the Full D1). Save the setting and name it something obvious (like 'HalfD1'). Close Compressor and find that setting file (HalfD1.setting). Open it in TextEdit and change the width resolution to 352. Overwrite the existing file and reopen Compressor. Your custom Half D1 should be updated. You've got a peculiar spec sheet and Compressor is very anal-retentive and inflexible. In other compression programs like BitVice I believe they have a myriad of presets like Half D1. It's worth looking into. LR Apokal Respond to this post   •   Return to posts index