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2. List of YouTube features - Wikipedia

   en.wikipedia.org/wiki/List_of_YouTube_features

   YouTube originally offered videos at only one quality level, displayed at a resolution of 320×240 pixels using the Sorenson Spark codec (a variant of H.263), [29] [30] with mono MP3 audio. [31] In June 2007, YouTube added an option to watch videos in 3GP format on mobile phones. [32]

3. YouTube TV - Wikipedia

   en.wikipedia.org/wiki/YouTube_TV

   YouTube TV is an American subscription over-the-top streaming television service operated by YouTube, a subsidiary of Google, which in turn is a subsidiary of Alphabet Inc., who announced YouTube TV on February 28, 2017. [2]

4. Analog television - Wikipedia

   en.wikipedia.org/wiki/Analog_television

   Analog television is the original television technology that uses analog signals to transmit video and audio. [1] ... picture quality from a digital ... cable TV, and ...

5. Low-definition television - Wikipedia

   en.wikipedia.org/wiki/Low-definition_television

   [citation needed] Also the size recommended for "medium" quality MMS videos. [citation needed] 144p 144p 192×144 27,648 4:3 The resolution 192×144 is used when 144p is selected on a fullscreen YouTube video. [citation needed] YouTube 144p 144p 256×144 36,864 16:9 One tenth of 1440p. The lowest resolution on YouTube since 2013. [10] QnHD 180p ...

6. Digital television - Wikipedia

   en.wikipedia.org/wiki/Digital_television

   Analog TV began with monophonic sound and later developed multichannel television sound with two independent audio signal channels. DTV allows up to 5 audio signal channels plus a subwoofer bass channel, producing broadcasts similar in quality to movie theaters and DVDs.

7. High-resolution audio - Wikipedia

   en.wikipedia.org/wiki/High-resolution_audio

   High-resolution audio (high-definition audio or HD audio) is a term for audio files with greater than 44.1 kHz sample rate or higher than 16-bit audio bit depth. It commonly refers to 96 or 192 kHz sample rates. However, 44.1 kHz/24-bit, 48 kHz/24-bit and 88.2 kHz/24-bit recordings also exist that are labeled HD audio.

8. 48,000 Hz - Wikipedia

   en.wikipedia.org/wiki/48,000_Hz

   In digital audio, 48,000 Hz (also represented as 48 kHz or DVD Quality) is a common sampling rate. It has become the standard for professional audio and video. 48 kHz is evenly divisible by 24, a common frame rate for media, such as film, unlike 44.1 kHz .

9. 44,100 Hz - Wikipedia

   en.wikipedia.org/wiki/44,100_Hz

   In video, 48 kHz is now the standard, but for audio targeted at CDs, 44.1 kHz (and multiples) are still used. The HDMI TV standard (2003) allows both 44.1 kHz and 48 kHz (and multiples thereof). This provides compatibility with DVD players playing CD, VCD and SVCD content. The DVD-Video and Blu-ray Disc standards use multiples of 48 kHz only.