你的電腦需要這個嗎？？——擷取卡原理解析：英語精讀講義

As you can probably imagine, 片語搭配

你可能想像得到，

we deal with a ton of video around here.

我們這裡要處理大量的影片。

A lot of it comes from cameras or screen recording software,

其中很大一部分來自攝影機或螢幕錄影軟體，

but we also make frequent use of capture cards, 片語搭配

但我們也經常使用擷取卡，

which are typically stand-alone, USB, or PCI Express devices

牠們通常是獨立的、USB或PCI Express裝置，

that can be used to record from external devices

可以用來記錄外部裝置，

like a game console or a camera

像是遊戲主機或攝影機，

like on the WAN Show,

就像在WAN Show上那樣，

which raises the question, 表達脈絡

這就引出了一個問題，

why haven't we made a video about a capture card in over 5 years?

為什麼我們超過5年沒有做過關於擷取卡的影片了？

Well, the truth is that I wasn't ever really satisfied with any of them. 表達脈絡

事實是，我以前對牠們都不太滿意。

But in recent years,

但在最近幾年，

they have improved immensely.

牠們有了巨大的改進。

And when Corsair and AMD reached out about doing a sponsored video 片語動詞

當Corsair和AMD聯絡我們做一期贊助影片，

about their new Vengeance A4100 gaming PCs

介紹他們新的Vengeance A4100電競電腦

with included capture cards,

並內建了擷取卡時，

it seemed like a no-brainer to take a look at how far they've come 慣用語

看看牠們到底發展到了什麼程度，

and demystify this category of products.

並且揭開這類產品的神秘面紗，這似乎是理所當然的事情。

So, today we talk capture cards,

所以，今天我們來談談擷取卡，

what they do,

牠們是做什麼的，

and why you should or should not buy one

以及你是否應該購買一個

for your game streaming or recording setup.

用於你的遊戲實況或錄製設定。

Before we get into whether you might need a capture card, 片語動詞

在我們討論你是否需要擷取卡之前，

it's important to understand exactly what they actually do.

了解牠們到底做什麼很重要。

A capture card is a device designed to take an unencrypted video signal 文法

擷取卡是一種設計用來接收未加密影像訊號的裝置，

and convert it into a format that can be understood

並將其轉換成

and recorded by the computer it's plugged into.

插入的電腦能夠理解並記錄的格式。

If your intention is to record TV or movies off Netflix,

如果你的目的是從Netflix錄製電視或電影，

be warned that those signals are encrypted using HDCP 語氣意圖

請注意這些訊號是使用HDCP加密的，

and no legal device is going to decrypt it for you.

沒有合法的裝置能為你解密。

For consumer devices,

對於消費級裝置，

it's typical to see an HDMI input

通常會看到一個HDMI輸入，

like what you'd get out of your game console,

就像你從遊戲機裡接出來的那種，

but in the professional world,

但在專業領域，

SDI is preferred for its longer maximum cable lengths,

SDI更受青睞，因為它的最大線材長度更長，

support for time code, and locking connector.

支援時間碼和帶鎖連接器。

Now, a typical capture card looks either like this,

現在，典型的擷取卡看起來要麼像這樣，

a box that

一個盒子，

Here we go.

找到了。

Plugs into the USB port on your PC,

插入電腦的USB連接埠，

or like this,

或者像這樣，

a well, box that plugs directly into the PCI Express slot on your motherboard.

一個可以直接插在主機板PCI Express插槽上的盒子。

These two styles make up the majority of consumer capture devices, 片語動詞

這兩種樣式構成了消費級擷取裝置的大部分，

and both of them are dependent on a nearby computer

牠們都依賴於附近的電腦

to handle the actual processing of the data.

來處理實際的資料處理過程。

Elgato offers both form factors for both tiers of their capture devices, 用詞

Elgato為他們兩級擷取裝置提供這兩種外形規格，

their HD tier, and their 4K tier.

他們的HD級別和4K級別。

And while there are some minor benefits and drawbacks to either approach,

雖然這兩種方法各有小優劣，

generally they share the same functionality.

但牠們通常具有相同的功能。

And when you plug them into your PC,

當你把牠們插入電腦時，

they're going to get picked up by your capture software in a similar way. 片語動詞

牠們會被你的擷取軟體以類似的方式辨識。

There are exceptions to this rule like the Cam Link series

這個規則也有例外，比如Cam Link系列，

that registers as a webcam, 用詞

牠會註冊為網路攝影機，

making it a little bit easier to use in video chat software.

讓牠在視訊聊天軟體中更容易使用。

In our experience,

根據我們的經驗，

PCI Express-based capture cards tend to be significantly more reliable,

基於PCI Express的擷取卡往往明顯更可靠，

just like water bottles from lttstore.com.

就像lttstore.com的水壺一樣。

Now, whether this is due to not having to deal with USB driver issues 文法

現在，這是否是因為不需要處理USB驅動問題，

because internal cards are closer to cooling fans,

因為內接卡更靠近散熱風扇，

or just because PCI Express is generally a lower latency,

或者只是因為PCI Express通常比USB延遲更低、

more stable interconnect than USB,

連接更穩定，

we are not sure.

我們並不確定。

USB cards, though, offer a lot more flexibility.

不過，USB卡提供了更多的靈活性。

Basically, any computer with a USB port that is USB 3,

基本上，任何帶有USB 3連接埠的電腦

can run them, laptops included. 文法

都可以運行牠們，包括筆記型電腦。

If you want to switch which system you're recording on,

如果你想切換錄製的系統，

you just got to move which USB port you're plugged into

你只需要換一個插入的USB連接埠，

rather than having to shut down a system, 文法

而不是必須關閉一個系統，

pull a PCI Express card,

拔出PCI Express卡，

shut down the other system,

關閉另一個系統，

put it in, and then fire them both back up. 片語動詞

插進去，然後再把牠們倆都啟動起來。

This flexibility can come with its own issues, 片語搭配

這種靈活性可能會帶來自身的問題，

as we mentioned before, though.

正如我們之前提到的那樣。

And we have found these cards tend to be a little less stable.

而且我們發現這些卡往往稍微不那麼穩定。

For instance, if you rock a budget motherboard 用詞

例如，如果你用的是一塊入門級主機板，

with only a single or best case scenario, 片語搭配

上面只有一個，或者最好的情況，

two USB controllers on it,

兩個USB控制器，

it's actually quite likely that you're going to end up overloading your USB controller 片語動詞

你實際上很可能會導致USB控制器過載，

by having too many high-throughput devices plugged into it,

因為插了太多高吞吐量裝置，

like if you were running, say for example,

比如，假設你正在運行

a 4K webcam and a 4K capture card for your game console

一個4K網路攝影機和一個給遊戲機用的4K擷取卡

at the same time.

同時進行。

Some people might not have a PC around to plug their capture card into,

有些人周圍可能沒有電腦來插入擷取卡，

though, like say at a LAN party or a tournament.

比如在區域網路派對或錦標賽上。

Fortunately, as I mentioned before,

幸運的是，正如我之前提到的，

there are also capture cards that feature stand-alone encoding and recording

也有支援獨立編碼和錄製的擷取卡，

like the 4K60 S+.

比如4K60 S+。

In this case,

在這種情況下，

a hardware encoding chip is installed in the capture device,

擷取裝置內部安裝了一個硬體編碼晶片，

which does the work that normally the attached computer would do

牠完成了連接的電腦通常會做的工作，

by encoding the incoming video stream into a playable video file.

把輸入的視訊串流編碼成可播放的影片檔案。

That allows those to record entirely on their own.

這讓牠們可以完全獨立錄製。

Just pop an SD card in and you're off to the races. 講解

只要插進一張SD卡，你就可以開始了。

They do tend to be a bit more expensive, though. 文法

不過，牠們往往要稍微貴一些。

Regardless of what it plugs into, though, 表達脈絡

不管牠插在什麼地方，

basically all gaming-oriented capture devices share one trait,

基本上所有面向遊戲的擷取裝置都有一個共同的特點，

and that is

那就是

Ah, there we go.

啊，找到了。

Pass-through. 用詞

環出功能（Pass-through）。

Pass-through is an essential feature if you want to be able to game

如果你想同時在你正在錄製的裝置上玩遊戲，環出是必不可少的功能，

on the device that you're recording at the same time,

在錄製的同時玩遊戲，

because otherwise, you would have to deal with the crazy latency

否則，你將不得不忍受極高的延遲，

of trying to game through your OBS preview window or something like that.

嘗試透過你的OBS預覽視窗或類似的東西玩遊戲。

With pass-through,

有了環出功能，

the main signal that you're capturing is passed through

你正在擷取的主訊號在被擷取的同時

back to your display while it's being captured.

會直接傳輸回你的螢幕。

So, this is usually through an HDMI output port on the capture card

所以，這通常是透過擷取卡上的HDMI輸出連接埠實現的，

with manufacturers generally claiming that there is zero added latency.

製造商通常聲稱零增加延遲。

That was something we wanted to investigate in this video.

這正是我們想在這個影片中調查的內容。

So, we tested all three styles of recorder from Elgato,

所以，我們測試了Elgato的所有三種錄製裝置，

USB with the HD60 S+,

USB的HD60 S+，

PCI Express with the 4K60 Pro,

PCI Express的4K60 Pro，

and stand-alone with the 4K60 S+ on our latency tester.

和獨立的4K60 S+，在我們的延遲測試儀上進行了測試。

And Hey, good news, Corsair.

嘿，好消息，Corsair。

We actually didn't find any appreciable increase in latency 片語搭配

我們在使用牠們任何一款時，

when using any of them.

實際上都沒有發現任何明顯的延遲增加。

So, then it's up to you which form factor of capture card 語氣意圖

所以，具體選擇哪種外形的擷取卡

is best for you.

完全取決於你。

Though, if you have the space and you don't need the extra flexibility,

不過，如果你有空間且不需要額外的靈活性，

we definitely encourage going with something PCI Express-based. 片語動詞

我們絕對建議你選擇基於PCI Express的裝置。

As for the resolution, 表達脈絡

至於解析度，

that just depends on your use case. 片語搭配

這只取決於你的使用場景。

If you're browsing Elgato cards,

如果你在看Elgato的卡，

the price differences between their two PCIe models,

他們兩款PCIe型號之間的價格差異

it's pretty minimal.

相當小。

So, it's $80 to go to the 4K60 Pro

所以，從HD60 Pro升級到4K60 Pro只要80美元，

from the HD60 Pro,

你就能獲得

and you gain the extra flexibility of high frame rate 4K recording.

高幀率4K錄製的額外靈活性。

Just make sure that your source content actually pushes that resolution.

只要確保你的來源內容實際上能達到那個解析度即可。

Although even then,

儘管如此，

for the minimal cost,

對於這極小的成本來說，

it might be worth future-proofing. 用詞

也許值得為未來的需求做好準備。

And it seems like Corsair agrees since this happens to be the card that's pre-installed 片語搭配

看來Corsair也是這麼想的，因為這正好是預裝在

in the Vengeance A4100 streaming PC that they sent over.

他們寄來的Vengeance A4100實況電腦裡的卡。

The configuration we have here is pretty dang smack on for streaming.

我們這裡的配置非常適合實況。

The Ryzen 3700X CPU

Ryzen 3700X CPU

has enough cores for gaming

擁有足夠的核心用於玩遊戲，

with some extras for video encoding.

還有額外的核心用於影片編碼。

And if you want less of a CPU hit,

如果你想減少CPU的壓力，

the equipped RTX 2070 Super comes with Nvidia's latest NVENC encoding chip,

配備的RTX 2070 Super帶有Nvidia最新的NVENC編碼晶片，

which allows for a near-zero performance hit 用詞

可以讓你在直接用GPU進行編碼時，

while encoding directly on the GPU.

效能損失接近於零。

Our specific config also comes with both a 480 gig NVME drive

我們這款具體配置還帶有480GB的NVME硬碟，

for excellent OS responsiveness

用於極佳的系統反應速度，

and 2 terabytes of mass storage for games,

還有2TB的大容量儲存用於遊戲，

video clips, duh,

影片剪輯，那是當然的，

or what have you. 慣用語

或者其他什麼東西。

So, now we know what all the capture cards

所以，現在我們知道所有的擷取卡

sort of look like and what they do. 語氣意圖

大概長什麼樣以及牠們是做什麼的了。

But the final question is, 表達脈絡

但最後一個問題是，

do you actually need one?

你真的需要一個嗎？

Can't you just capture your screen with Fraps or OBS?

你不能用Fraps或OBS直接錄製螢幕嗎？

Well, in a lot of cases, yes.

呃，在很多情況下，是的。

If you're strictly a PC gamer and you don't have any external capture requirements,

如果你純粹是PC玩家，並且沒有任何外部擷取需求，

like no DSLR camera,

比如沒有單眼相機，

Xbox, Nintendo Switch, or the like, 慣用語

Xbox，Nintendo Switch，或者類似裝置，

then there really isn't any major benefit to running a capture card in your system. 文法

那麼在你的系統裡安裝擷取卡真的沒有任何重大好處。

Fortunately for you, though,

不過，對你來說幸運的是，

the Vengeance A4100 along with Corsair's other gaming systems 文法

Vengeance A4100和Corsair的其他遊戲系統

is available without a capture card

都有無擷取卡的版本提供，

to save you the unnecessary purchase

為了幫你省下不必要的開銷，

if you don't need it.

如果你不需要的話。

So, thanks for watching.

那麼，感謝觀看。

If you're interested in more technical streaming recording stuff,

如果你對更多技術性的實況錄製內容感興趣，

maybe check out our video on building a streaming setup on the cheap. 慣用語

也許可以看看我們關於低成本搭建實況配置的影片。

And get subscribed so you don't miss future videos

請訂閱我們，這樣你就不會錯過未來的影片了，

like this crazy Asetek PCI Express slot radiator water cooler thing that we've got coming very soon.

像是即將推出、介紹這款瘋狂的Asetek PCI Express插槽水冷散熱裝置的影片。