#MPEG2

[s0lid0]

[filestack]

Mpeg-2 Video Extension | FileStack Blog

Mpeg-2 video extension can play audio/video media or simply audio. Mpeg-2 video files are low in size but also relatively low in quality. They also have lossy compression. There quality will degrade after being edited numerous times. Mpeg files are best used when video will be recorded once and never edited. For more information, visit the website.

[sillyabtmusic]

giffing is trying to teach me abt video formats & encoding but it is going right over my head 😭

[brokehorrorfan]

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[dreamcatcher-roulette]

Anonymous asked:

Hullo, hope you're doing well and enjoying the comeback and the albums 🤩🤩 looking forward to when they'll show up in roulette!

Pls feel free to ignore as this may be a little dumb, but I figured you might know?

From what I can vaguely understand from Wiki and from your past response, can I assume TV broadcast files are usually .ts files? And that it's not the file type that dictates the "quality," but rather the encoding?

There's a Twitter account (😭 I forgot which, it's lost on my timeline now) that occasionally posts .ts files of DC's music show performances, the most recent file being :

240718.MnetJP.엠카운트다운.드림캐쳐.JUSTICE.H264.AAC.1080i-AbySSS.ts

Going off the name and what you've mentioned before about "best quality" where 1080i h264 is better than Youtube, would this file probably be better than downloading the YT video of the same performance?

Fake ask again to strip links because I'm really good at being unnecessarily paranoid but YES! I am having a blast. Siyeon’s absence is felt but it's nice to see her still pop up in some of the YouTube show performances. Handong is totally killing her parts too though so it's been fun seeing that 😁

On the question of quality:

(Minor point of clarity: the encoding is an aspect which determines the quality but not the only one. The simplest quality measure is probably taking into account encoding AND bitrate, where bitrate is the amount of data being displayed per second and encoding is how efficiently it's compressed. Technically the best quality is the highest possible bitrate with zero compression but that's just not feasible, so this is where encodings come in. Newer encodings are, as a rule of thumb, better quality than older ones at "sensible" bitrates, but, as in the case of YouTube for example, a much lower bitrate can make a newer encoding look much worse than an older one. That's why in my quality ranking YouTube was beneath MPEG2 - YouTube is almost all h264 for 1080p, which is newer than MPEG2, but the bitrates drag the quality down the drain.)

Generally 1080i recordings, in their "rawest" form, are MPEG-TS (.ts) files, yeah. 4k are more commonly posted in MP4 though I've found. I'm speculating here based off my own experiences (I haven't ever asked anyone who does this if this is the true reason) but I think that's because MPEG-TS just isn’t efficient enough at high bitrates to provide a very pleasant viewing experience. Let me demonstrate using a convoluted metaphor:

Say you’re a marble vendor and you are looking to transport two blue marbles and two red marbles to one of your clients. You need a container to send them in. Because these marbles are quite precious you want to make sure that they are sent in a well fortified box, but you also care about fitting as many boxes as possible into your supply trucks, so you don't want to waste any space inside of them. You pack all four marbles tightly into the box and seal it up.

When your client receives their shipment, they open it up and can easily see all four marbles in the box. There isn’t much incentive for them to move the marbles since, even though the box has a bit of a heavy hinge, it's not really that big of a deal and any other box would incur some cost in opening it too. They place the box on their shelf and don't worry about it any further.

Now imagine you want to send a client one hundred thousand marbles. But your boxes still only fit four marbles each. The transportation is easy and efficient because the boxes stack nicely (assume for a moment you also have an extremely efficient marble box packing machine), but, once they all arrive at their destination, your client doesn't want to search through hundreds of boxes trying to find the marble they are looking for. They want to move all those marbles to a much bigger and well sorted marble... Okay I really don't know what people normally store hundreds of thousands of marbles in. But the point being that even though all the marbles are still the same, at a certain volume the transportation container was no longer optimal to keep at the destination. 4k HEVC .ts files are HORRIBLY inefficient at rendering even on relatively good hardware and moving the data to MP4 has huge performance benefits.

So the file extension of the source doesn't matter? Well I still think it does, psychologically. I would always trust a .ts more than a .mp4 at 1080i. It isn't possible for you to know, without the original, that what the uploader did was a remux (changing the container) rather than a re-encode (a lossy operation which, best case scenario, produced an output that looks equivalent to the human eye because nothing crucial was lost). Well intentioned people accidentally re-encode to MP4 all the time without realising what it does to the integrity of the file. It's much less likely someone has had the same mishap in the other direction because .ts is not a commonly desired destination. So even though a remuxed MP4 is identical in quality to it's MPEG-TS source, in order to avoid other people's translation errors I would always trust an available .ts first.

That file, assuming it is what it says it is, would absolutely be better than downloading the same performance from YouTube. YouTube has done a lossy re-encode on the video the broadcaster uploaded and will not ever serve you the original. A really obvious symptom of this is the file sizes. YouTube will always be a lot smaller. (For the same encoding. Which by the way you can find out by using Media Info. AVC=h264, HEVC=h265) It's pretty noticeable to the human eye in motion, so it can be a fun exercise to play the two side by side and compare. It's also noticeable on a frame by frame level if you use a player that lets you do that.

But yeah, in summary, YouTube's version of that performance will be unquestionably worse. On average it will be missing 3/4 of the information stored in the original. Which, because of how cool compression is, actually still produces a pretty decent image, but it falls apart in motion and really if you are an individual wanting to watch something for your own enjoyment instead of a big company trying to optimise their bandwidth usage there's just no need to sacrifice those pixels.

[littlewalken]

A couple more Julian Lennon things you might not have known existed

Haven't seen the teapot one yet

The David Copperfield is a very loose interpretation and might have nightmare fuel besides having Howie Mandell, lol.

[atplblog]

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[igorcbarros]

01/04, hááá!!!

Pois é, já tomei conhecimento de umas 3 picardias de primeiro de abril nas redes sociais que eu conheço. O que pareceu primeiro de abril mesmo, comigo, foi em outra data. Tinha aproveitado uma oferta internacional das Lojas Americanas - sim, ainda confiei neles - de um HD externo de 8Tb por 145 reais. Um de DOIS terinhas que mal enche o buraco do dente, em lojas físicas, que eu saio com ele debaixo do braço, está cerca de 800 pila, ou seja, ou eu edito materiais à granel de forma volante, ou a minha família fica sem comer.

Mas a compra foi cancelada de forma unilateral. Não foi a primeira vez que isso acontece, mas essa doeu. O HD externo faz muita falta, enquanto o pessoal do serviço prefere ficar tuxando os HDs com programas de 2021 em MPEG2 (salve programa "F" e programa "V"!!)

[nctwish]

240224 Venue101

240224 Venue101 (1080i MPEG2) https://terabox.com/s/16O1CqxZT5vEJVdwSDhWwPw… #TREASURE #트레저 #NCTWISH cr: __Bita_

[135481403135481403]

しゅ @jinkame12tori 2024/01/02 (火) 14:17:19 [HD MPEG-2 TS] レミオロメン - 粉雪 （2005 11 18 Music Station） 1440 x 1080

#レミオロメン #藤巻亮太 #MusicStation #Mステ #MS #HD #MPEG2 #ts #HDTS

https://twitter.com/jinkame12tori/status/1742052431033500073

[vendorclix]

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You can connect to the Internet by using an external Wifi adapter network cable to access the Internet to enjoy YouTube, DLNA, and other Network applications.

3-Two high-speed USB 2.0

4-Fully Compliant with the DVB-S / DVB-S2 / DVB-S2x digital TV Reception Standards

5-Support /SDTV MPEG2/MPEG4/H.264/H.265 HEVC decoding

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13-Reception for SCPC/MCPC.C+Ku Band reception

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15-Favorite Channels edit .parental lock

16- Variable aspect ratio (4:3,16:9) 4:3 pan &scan or letterbox mode

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19-1GB RAM

Solid SF-630 TV Digital Satellite dB Meter

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[dthnews]

TEST 503 MPEG2 Slot Vacant on Channel Number 77 | FreeDish

See on Scoop.it - Latest News and Updates

TEST 503 MPEG2 Slot Vacant on Ca on DD Free Dish platform. You can scan your satellite receiver to find this slot. This satellite feed is without TV c

[atplblog]

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[teardownit]

HDMI over-IP extenders. Are they all the same? Negative experiences in use

Earlier in the post (link), we tested the Lenkeng LKV373 kit and verified that the delay was insignificant - 0.067 seconds.

We recently examined the Lenkeng LKV383PRO over-IP extender kit, which upset us. Let's look into what the problem is.

What's the difference between a regular twisted-pair HDMI extender and an over-IP

1. Regular twisted-pair HDMI extender. The transmitter and receiver are connected to each other by a single piece of twisted pair (usually 130 to 330 feet). The twisted pair is used exclusively as some transport for specific signals. Video is transmitted in its original quality and without delay in this case.

2. Over-IP HDMI extender. Transmitter and receiver work on IP protocol, which means they can be connected to a local Ethernet network. The transmission range is limited to IP protocol, i.e., 330 feet. The range can be increased if a switch is connected between the transmitter and receiver in the middle. In this case, the video usually shows signs of slight compression and is transmitted with a small but visible delay.

An additional undeniable benefit of over-IP devices is the ability to connect additional receivers that connect to a LAN switch. They will display video from a single transmitter on that LAN without additional settings. Similar connection schemes can connect multiple TVs in a store to display promotional information.

When choosing an extender of the first type, everything is simple. You must decide on the maximum video resolution (FullHD or 4K) and video transmission range.

When choosing an extender of the second type, in addition to resolution and range, you need to pay attention to two more essential parameters: compression and delay.

HDMI over-IP extender image compression

Most low-cost HDMI over-IP extenders use video compression. An HDMI transmitter receives video at its input, encodes it with a specific codec (MPEG2, MPEG4, or other), and transmits it to the LAN network. The receiver receives this signal, decodes it, and outputs the video to the HDMI output. With this method of transmission, we may see a slight loss of image quality. At the same time, image deterioration can be observed only in some use cases. For example, when transmitting laptop desktop, showing documents. In this case, we can see a slight distortion of small details (letters, punctuation marks). When sending classic video content, image compression is difficult to see.

More expensive HDMI over-IP extenders use uncompressed transmission. Unfortunately, this device is still rare due to its high cost.

HDMI over-IP extenders video transmission delay

This parameter depends directly on the compression of the image. It takes time to encode and decode the image. Plus, more time for transmitting data packets in the IP network.

We experimented with Lenkeng LKV373 earlier and received an average delay of 0.067 seconds with a direct twisted pair connection without a switch. We considered this delay to be insignificant.

Recently we came across an older model of the same manufacturer - Lenkeng LKV383PRO. The main differences from the younger model are the transmitter's HDMI pass-through output and the IR signal reverse transmission.

When connecting it, we noticed a delay in video transmission, which was very noticeable. This upset us.

Having measured the delay, we got an average result of 0.5 seconds, which sometimes decreased to 0.2 seconds. Recall that the younger model managed in the same conditions for a relatively stable 0.067 seconds.

Instead of a conclusion

Who does NOT care? Let's say you have a TV receiver in one room and a TV in another. There are LAN outlets near the TV and the receiver. You can easily buy this set. It allows you to transmit video from one room to another. You can also remotely control the IR remote control of your receiver from the side of your TV. You won't notice any lag at all. Only a slight lag when scrolling through the menus.

Who cares? Suppose you are in a bar with a remote TV or projector connected to your laptop. You decide to output the sound separately to a sound amplification system connected directly to the computer. In this case, you will get mismatched audio and video. If there is a delay of 0.067 seconds, this can be neglected. At a delay of 0.5 seconds, it is very noticeable and annoying.

Unfortunately, you will not find this parameter in the technical specifications of the devices. It can be obtained only by experience after purchase. For most users, these two parameters will be optional. But someone can expect an unpleasant surprise.