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Expansion
editI have expanded the page as much as I can for the moment. Hopefully this will help somewhat. Sycophant 22:56, 21 March 2006 (UTC)
Professional Disc vs. Blu-Ray -RW
editWhat's the difference between Professional Disc and Blu-Ray? Pro Disc seems to be an exact copy of rewriteable Blu-Ray in a disc caddy. --72.202.150.92 04:00, 12 March 2007 (UTC)
- They are very similar formats, I believe - the Blu-ray entry has this to say:
- Blu-ray Disc is similar to PDD, another optical disc format developed by Sony (which has been available since 2004) but offering higher data transfer speeds. PDD was not intended for home video use and was aimed at business data archiving and backup.
- They are similar but different as far as I know.
- --Sycophant 08:30, 13 March 2007 (UTC)
Conflicting information
editThe entry states that one format XDCAM uses is MPEG IMX, which MPEG-2. Then later it states MPEG IMX does not use temporal compression. But doesn't all MPEG-2 streams use temporal compression? --24.249.108.133 15:23, 5 October 2007 (UTC)
- MPEG IMX is a technically MPEG-2 4:2:2 P@ML which is I-frame recording, so all compression is intraframe. There is no temporal compression, only spatial compression. Sycophant 07:47, 7 October 2007 (UTC)
PFD50
editSurely PFD50 is a double layer disc, not a double sided one as the article says? I have no proof so I haven't made the edit. 83.104.249.240 (talk) 14:55, 16 September 2008 (UTC)
XDCAM SD Colour Sampling
editI was trying to work out the XDCam SD colour sampling from this and I could not. Is it 4:2:0 or 4:2:2?
Just to compare the Sony formats with DVCpro. --Wool Bridge (talk) 21:38, 11 October 2011 (UTC)
- MPEG IMX is 4:2:2, while DVCAM is either 4:1:1 or 4:2:0 depending on area. Mikus (talk) 01:00, 19 October 2011 (UTC)
never heard of 29.97i
editThere's either 60i or 30p/29.97p which means 60 fields or 29.97 frames per second. There's no such thing as 29.97i. Please review it. — Preceding unsigned comment added by 109.185.25.227 (talk) 20:08, 12 May 2012 (UTC)
cites for audio coding?
editWhat's the source of the audio coding column in the table? For example MPEG HD says "PCM 4 ch/16 bit/48 kHz". Where did this data come from? It looks like it was added by Mikus on 16:38, 25 October 2010 according to history. Annex A of EBU-R134 ("MXF & Multi Channel Audio") supports this data, but as a recommendation, that document's data is derivative rather than authoritative. Chris Dolan (talk) 15:42, 21 January 2013 (UTC)
Aha, I've found some Sony marketing material that seems to support the data table in the article: http://ws.sel.sony.com/PIPWebServices/RetrievePublicAsset/StepID/SEL-asset-152359/original/xdcamhd422family_2408d.pdf has a table on page 3. Chris Dolan (talk) 16:39, 21 January 2013 (UTC)