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21. | YouTube originally offered videos at only one quality level, displayed at a resolution of 320x240 pixels using the H.263 Sorenson Spark codec, with mono MP3 audio.[82] In June 2007, YouTube added an option to watch videos in 3GP format on mobile phones.[83] In March 2008, a high quality mode was added, which increased the resolution to 480x360 pixels[84] In November 2008 720p HD support was added.[85] With this new feature, YouTube began a switchover to H.264/MPEG-4 AVC as its default video codec. In November 2008, the YouTube player was also changed from a 4:3 aspect ratio to a widescreen 16:9. In November 2009, 1080p HD support was added. In July 2010, YouTube announced that it had launched a range of videos in 4k format, which allows a resolution of up to 4096x3072 pixels.[86][87]YouTube videos are available in a range of quality levels. The former names of standard quality (SQ), high quality (HQ) and high definition (HD) have been replaced by numerical values representing the vertical resolution of the video. The default video stream is encoded in H.264/MPEG-4 AVC format, with stereo AAC audio गुणवत्ता मानक के यू ट्यूब विडियो में एक एमपी 3 (MP3)ऑडियो वीडियो स्ट्रीम शामिल करती है गलती से (mono) यह २२०५० एचजेड़ पर नमूने (bit rate) में ६४ के बिट/एस के दर (sampled) पर मोनो में कूटबद्ध है जो करीब १० के एच जेड़ का एक ऑडियो बैंडविड्थ (bandwidth) दे रहा है.गलत बिट दर खरा को डिलीवर करता है पर हाई फाई (hi-fi) ऑडियो मानक को नही.एक स्तरीय यू ट्यूब विडियो के पास एक स्टेरेओ (stereo)ऑडियो ट्रैक का होना सम्भव है यदि मूवी संचिका बदलने के पहले ऍफ़एलवि (FLV) प्रारूप में अपलोड होती है यह कार्यक्रम के साथ हो सकता हैजैसे लिनुक्स और विन्डोज़ (Windows) के लिए ऍफ़ऍफ़पिईजी (ffmpeg) और मसिन्तोश (Macintosh) के लिए फ़ऍफ़पिईजीएक्स (ffmpegX) या वाणिज्यिक रीवा एफेल्वी एनकोडर के लिए windows |
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