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Guest Message by DevFuse

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Networks in SD?

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21 replies to this topic

#21 OFFLINE   Mike109



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Posted 14 May 2011 - 12:39 AM

The OTA signal is MP2 and is recorded that way. Most of the HD and a lot of the SD from Dish is MP4, which is more compressed.

I was curious as to the format of the original source & if there was some menu in the DVR that displayed the information.

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#22 OFFLINE   RasputinAXP


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Posted 14 May 2011 - 06:46 AM

I was curious as to the format of the original source & if there was some menu in the DVR that displayed the information.

No, but OTA's requirements are strictly defined in the ATSC standards:

For transport, ATSC uses the MPEG systems specification, known as an MPEG transport stream, to encapsulate data, subject to certain constraints. ATSC uses 188-byte MPEG transport stream packets to carry data. Before decoding of audio and video takes place, the receiver must demodulate and apply error correction to the signal. Then, the transport stream may be demultiplexed into its constituent streams.


There are three basic display sizes for ATSC. Basic and enhanced NTSC and PAL image sizes are at the bottom level at 480 or 576 lines. Medium-sized images have 720 scanlines and are 1280 pixels wide. The top tier has 1080 lines 1920 pixels wide. 1080-line video is actually encoded with 1920×1088 pixel frames, but the last eight lines are discarded prior to display. This is due to a restriction of the MPEG-2 video format, which requires the number of coded luma samples (i.e. pixels) to be divisible by 16.

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AT200, Hopper & 360 via HDMI to Onkyo 505 to basement 42" Westy, Hopper via Comp-over-Cat5 to living room 42" Vizio with a Roku 3, Joey to Toshiba 32" LCD with a Logitech Revue. You want fries with that? Pull up to the 2nd window.

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