YouTube․com больше не поддерживает воспроизведение 4K-видео в Safari.

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Пользователи десктопного браузера Safari лишились возможности просматривать видео на YouTube в разрешении 4K. На этот факт обратили внимание читатели ресурса Reddit.

Сейчас при просмотре в Safari роликов на популярном видеохостинге максимальное допустимое качество составляет 1080p. Опции 1140p и 2160p пропали из списка доступных. В то же время, при просмотре видео в браузере Google Chrome есть возможность переключиться на максимальное качество.

Пользователи Reddit высказывают разные предположения, наиболее правдоподобное объяснение у Themcfly:

«При дальнейшем исследовании я обнаружил, что YouTube сохраняет видео на серверах в разных форматах, кодируя их с помощью кодека VP9, либо старого H264. У Safari отсутствует поддержки VP9… поэтому он автоматически подгружает доступную версию в формате H264 (посмотреть кодек можно правым кликом на видео). Chrome поддерживает формат VP9, поэтому воспроизводит видео в качестве 4K».

Раньше для потокового воспроизведения YouTube почти исключительно применял давно ставший стандартом кодек H.264/AVC. Но с недавних пор видео в высоком разрешении сжимается с помощью VP9, — открытого видеокодека, разработанного Google с целью уменьшить битрейт при сохранении качества видео на уровне с VP8 (открытый аналог H.264).

Проблема с VP9 состоит в том, что он поддерживается не везде. Операционная система Android и браузер Chrome включают кодек по стандарту. Но вот в Safari на Mac, iPhone и iPad не поддерживается воспроизведение такого видео и в Купертино ничего не говорят о возможной поддержке VP9 в будущем.

Apple и Google не смогли оперативно прокомментировать ситуацию.

Источник — macdigger.ru

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