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Are YouTube videos lossless?
A common lossless codec is H. 264, and this is also the preferred codec for YouTube. However, it is by no means the only accepted codec, as YouTube accepts almost all codecs.
Does YouTube use VP9?
YouTube has two codecs it automatically chooses between – the avc1 and the vp9. The vp9 codec offers a much higher image quality than the avc1.
Does YouTube still use h264?
According to YouTube, the recommended video format is the . MP4 file type. To display your videos at the highest quality possible, YouTube also recommends using the h. 264 video codec and a standard aspect ratio of 16:9.
Why do I have to re-encode my YouTube videos?
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). Note that YouTube always re-encodes videos to optimize their playback quality.
What kind of codec does YouTube use to transcode videos?
If YouTube starts using a new codec like VP9, they’ll transcode your video using your original upload. If you uploaded an H.264, that’s as good as it’s going to get. But, before you go running off to upload all of your uncompressed HD 1080p files, there are a few things you’ll want to keep in mind.
When to use IDR for encoding for YouTube?
For example, the rule of thumb when encoding for playback is that each key frame should be an IDR frame. However, IDR key frames are larger than normal key frames, which is less efficient compression-wise. When encoding for upload to YouTube, playability isn’t an issue, so Louden recommends an IDR frame every third keyframe.
What happens when you upload a video to YouTube?
YouTube starts with your HD video and then scales it down to each of the smaller resolutions it will be streaming. YouTube re-encodes every upload at multiple resolutions so your viewers can choose the viewing option that best fits their connection speed.