![]() Similarly, the player frames 16:9 videos with horizontal bars (letterboxing) if those videos are played in a standard (4:3) player. For example, the player frames 4:3 videos with vertical bars (pillarboxing) when those videos are played in a widescreen (16:9) player. The YouTube player automatically frames videos to ensure that they are displayed correctly, without cropping or stretching, regardless of the size of the video or player. Examples of undesirable techniques include upsampling and transfer processes such as Telecine pulldown.Īspect ratio: Videos should be in their native aspect ratios, and uploaded videos should never include letterboxing or pillarboxing bars. ![]() Please do not use resampling techniques since they can cause images to shudder and often result in lower quality video. Typically, frame rates are set at 24, 25 or 30 frames per second. For film sources, a 24fps or 25fps progressive master yields the best results. ![]() Minimum audio-visual duration: 33 seconds (excluding black and static images in the video channel as well as silence and background noise in the audio channel)įramerate: Videos should be in their native frame rates without resampling.
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