If the video's native aspect ratio is 1.33:1 and the total frame size does not have a 1.33:1 aspect ratio, use 4:3 matting with square pixels and a single-color border with no variations over time. If the video's native aspect ratio is 1.33:1 and the total frame size also has a 1.33:1 aspect ratio, use 4:3 matting with square pixels and no border. If the video's native aspect ratio is 1.77:1 and the total frame size does not have a 1.77:1 aspect ratio, use 16:9 matting with square pixels and a single-color border with no variations over time. 
If the video's native aspect ratio is 1.77:1 and the total frame size also has a 1.77:1 aspect ratio, use 16:9 matting with square pixels and no border. See Advanced encoding for visual examples. 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.
Audio codec: MPEG Layer II or Dolby AC-3. The following specifications provide optimal playback of MPEG-2 and MPEG-4 videos: If you cannot submit videos in MPEG-2 format, then MPEG-4 is the preferred format. 
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Note that YouTube always re-encodes videos to optimize their playback quality.įile format: YouTube prefers the original, 1080p HD broadcast format that you have in your digital content library, as well as DVD-compliant MPEG-2 program streams saved with a. YouTube encourages partners to upload videos that are as close to the original, high quality source format as possible to increase the likelihood that your videos will play in higher quality (HQ). The following guidelines describe the formatting specifications that yield the highest quality for playing videos on YouTube. You must be either the copyright holder or the authorized representative of the copyright owner for all video and audio files that you deliver to YouTube.
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