Quality of the new HD from DirectTV
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It should be encoded straight to MPEG4 from the source, I don't see why they would have to run it through MPEG2 first.
I really don't know if direct will be receiving the programming off of the cband satellites that the broadcasters use or will they get the programming via fiber and then do the re-uplink thing to directtv 10. But really my question is will the new HD from directtv be hdlite. I guess I will monitor this forum in the future and see what you guys have to say about the quality of the new channels before switching providers.
Thanks
Thanks
If people talking about the lil's in mpeg 4 is any indication, HD lite will be a thing of the past.
Jimbo
If they don't downlink the programming how would they uplink it to the sats for distribution ?
Jimbo
Oh you are funny. You know there are a lot other factors such as downrezzing etc, and all of the formats can look equal given the proper bitrate.But vurbano, its "simple".
I cant believe we have people that uninformed here.
Oh you are funny. You know there are a lot other factors such as downrezzing etc, and all of the formats can look equal given the proper bitrate.
When I read his statement I was like "WTF?" .
A simple answere would be to go and research all of the compression techniques and you answer would be obvious.
comparing compression techniques is like picture compression techniues like jpeg, png, gif. All are different and some are better than the other. In the case of jpeg as you recompress you loose detail. The idea of compression is to get the most information in the smallest package. A raw video is the best. As we compress we loose detail or we loose time in the assembly/ disassembly process. There are different mpeg4 processes. some better. some are quite innovative in their processing. I f all we did was use a mathematical equation for compression the decompression would be the reverse. Probably all we would be concerned with is how fast that process could occur. That could be a problem when we go into action sports. The process has to be fast. An example might be 1080i vs 780p. For sports 780p is better because of the two different types of interlace. (go look it up) If it was scenery 1080i would have the detail but in a sport such as a race the picture slightly jitters. Mpeg processing tries to remove information about the picture that is unnessary so the size of the data file is smaller. Just that would be great. The picture is composed of pixels We want to see all of those pixels. So unless we see them all we loose some of the detail. More to follow.
More:
Due to its simplicity, Motion JPEG is a good choice for use in many applications. It ensures inexpensive equipment at the cost of slightly higher bandwidth consumption. For more efficient bandwidth usage, some of the true motion picture compression standards are preferred.
MPEG–1 can be more effective than MJPEG. However, at a slightly higher cost, MPEG–2 offers some advantages that provide better image quality -- comprising of frame rate and resolution -- but requires more network bandwidth consumption. It is also a more complex technique. MPEG–4 is developed to offer a compression technique for applications demanding less image quality and bandwidth. It is also able to deliver video compression similar to MPEG–1 and MPEG–2, with higher image quality and higher bandwidth consumption.
Since the H.261/H.263 recommendations are neither international standards nor offers any compression enhancements compared to MPEG, they are not of any real interest. Some definitions:
Interlaced – A technique used in old television system where the picture is divided into two half pictures containing every other line each. When displayed, first the odd lines are displayed then the even lines followed by the odd lines of the next picture and so on. This is the opposite of Progressive Scan.
Progressive Scan – Each picture in the video sequence is the full picture displayed all in once. This is the opposite of Interlaced.
PAL – Phase Alternating Line. This is the standard for the analog television format used in Europe with 625 lines at 50 half-pictures per second, i.e. Interlaced video.
NTSC – National Television Standards Committee. This is the standard for the analog television format used in the US with 525 lines at near 60 pictures per second, i.e. Interlaced video.
HDTV – High-Definition Television. A standard for television of picture size 1920 ´ 1044 at 30 pictures per second.
MPEG – Motion Picture Experts Group. The committee responsible for developing the MPEG standards. Homepage at: www.mpeg.telecomitalialab.com
Interesting comparison:
MPEG
From this, there is an obvious question: See it?
WIDTH
1
2
4
Max bit rate (Mbps)
1,86
15
15
Picture width (pixels)
352
720
720
Picture height (pixels)
288
576
576
Picture rate (fps)
30
30
30
2
4
Max bit rate (Mbps)
1,86
15
15
Picture width (pixels)
352
720
720
Picture height (pixels)
288
576
576
Picture rate (fps)
30
30
30
From this, there is an obvious question: See it?
WIDTH
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All right here is a pro statement for mpeg 4. The encoding rate is faster. When you have high definition you have a high bandwidth picture. You need to encode and decode it quickly. Mpeg 4 is better at that than mpeg1. Raw video is still better image quality. It take high bandwidth to transmit.
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