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<div class="gmail_quote">On Wed, May 9, 2012 at 3:11 PM, Andre <span dir="ltr"><<a href="mailto:mythtv-list@dinkum.org.uk" target="_blank">mythtv-list@dinkum.org.uk</a>></span> wrote:<br>
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<div class="im"><br>On 9 May 2012, at 20:59, Devin Heitmueller wrote:<br><br>> On Wed, May 9, 2012 at 2:48 PM, Matt Garman <<a href="mailto:matthew.garman@gmail.com">matthew.garman@gmail.com</a>> wrote:<br>>> Is there a way to tell if a given recording is interlaced or not?<br>
>> FWIW, I'm in Chicago, IL, USA. We record the national networks,<br>>> primarily FOX ("WFLD 32").<br>>><br>>> I ask for the following reason: a while ago, I started experimenting<br>
>> with using Intel (Sandy Bridge) graphics, so I could lose my<br>>> power-hungry Nvidia card. During initial testing, I disabled<br>>> de-interlacing in my playback profile. And to this day, I still don't<br>
>> have any interlacing enabled, because everything plays back<br>>> beautifully.<br>>><br>>> So either I am recording progressive content, or my TV (Panasonic<br>>> TC-P65V10) is doing the deinterlacing for me.<br>
><br>> Probably the fastest way to check is run ffmpeg against the recording<br>> and look at the height/width. A height of 720 is progressive and 1080<br>> is interlaced (it is possible to have 1080 progressive, but you'll<br>
> never see it in an OTA broadcast).<br><br></div>Um, well in the UK there are transmissions that switch between 1080i and 1080p on Freeview HD, there are also some Sky HD satellite transmissions at 1080p25.<br><br>Some of the (American) encoder manufacturers told me they have had this feature for some time, so maybe it will be used.</blockquote>
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<div>While 1080p24 and 1080p30 are valid ATSC formats, I don't know of any broadcasters that ever use them. 1080p60 is not currently a valid ATSC format, but it potentially could be used with H.264 compression.</div>
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