Occur, depending on the specific codec and how much compression is being To some degree, artifacts and other forms of quality degradation wil Lossless compression cannot reduce the overall video size nearly as muchĪs lossy compression the resulting files are likely to still be too Video encoder configuration effects on quality and size Feature Effect of codec configuration on encoded output In addition to general codec options, the encoder could be configured to reduce the frame rate, to clean up noise, and/or to reduce the overall resolution of the video during encoding. The degree to which these affect the resulting encoded video will vary depending on the precise details of the situation, including which encoder you use and how it's configured. The higher the resolution of a video, the larger it gets. Typically be able to more accurately portray the original scene, barring Higher resolution video, presented in the same screen size, will Variations caused by noise, the compressed video will be larger. Unless youĬonfigure the encoder in a way that ignores some or all of the Likely to have compressing the image to the same degree. The more variability-such as noise-there is in the image, the moreĬomplex the compression process and the less success the algorithm is Need to drop details to achieve the same level of compression. Variability generally makesĬompression more difficult, resulting in more lost quality due to the Picture noise (such as film grain effects, dust, or other grittiness to For thisĪnd other reasons, the more motion there is in a video, the larger the The complexity introduced by motion results in larger intermediateįrames due to the higher number of differences between frames). These differences are, and the less effective the compression is atĪvoiding the introduction of artifacts into the compressed video. The more successive frames differ from one another, the larger
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Update the previous frame to approximate the appearance of the followingįrame. They differ, and constructing records containing enough information to Rates cause larger compressed video sizes.Ĭompression of video typically works by comparing frames, finding where Eventually the point of diminishing returns isĪssuming the frame rate is not reduced during encoding, higher frame To a point, the higher the frame rate, the smoother and more realistic Primarily affects the perceived smoothness of the motion in the image. The determining factor is what internal storage Represented without visible stepping of the colors.ĭepending on the codec, higher color depths may result in largerĬompressed file sizes. Per component (10-bit color) allow banding, where gradients cannot be Image (that is, where colors are pure and intense, such as a bright, Additionally, in saturated portions of the The higher the color bit depth, the higher the quality of color fidelity The potential effect of source video format and contents on the encoded Some lossless codecs do exist, but they are typically used for archival and storage for local playback rather than for use on a network. Some details may be lost the amount of loss depends on the codec and how it's configured, but as a general rule, the more compression you achieve, the more loss of detail and fidelity will occur. Most video codecs are lossy, in that the decoded video does not precisely match the source. Just as audio codecs do for the sound data, video codecs compress the video data and encode it into a format that can later be decoded and played back or edited. Not only is the required storage space enormous, but the network bandwidth needed to transmit an uncompressed video like that would be enormous, at 249 MB/sec-not including audio and overhead.
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A fairly typical 30 minute video conference would need about 447.9 GB of storage, and a 2-hour movie would take almost 1.79 TB (that is, 1790 GB).A minute of HD video would need 14.93 GB of storage.At a typical 30 frames per second, each second of HD video would occupy 248,832,000 bytes (~249 MB).
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