![]() ![]() Eventually the point of diminishing returns is reached. To a point, the higher the frame rate, the smoother and more realistic the motion will appear. Primarily affects the perceived smoothness of the motion in the image. The determining factor is what internal storage format is used for the compressed data. Additionally, in saturated portions of the image (that is, where colors are pure and intense, such as a bright, pure red ), color depths below 10 bits per component (10-bit color) allow banding, where gradients cannot be represented without visible stepping of the colors.ĭepending on the codec, higher color depths may result in larger compressed file sizes. The higher the color bit depth, the higher the quality of color fidelity is achieved in the video. The potential effect of source video format and contents on the encoded video quality and size Feature It all depends on the underlying algorithms and mathematics. Some have trouble with specific kinds of shapes and patterns, or aren't good at replicating sharp edges, or tend to lose detail in dark areas, or any number of possibilities. However, things such as frame rate and, obviously, resolution will always have an impact on the output size of the media.Īdditionally, all codecs have their strengths and weaknesses. If the codec converts the media into an internal pixel format, or otherwise represents the image using a means other than simple pixels, the format of the original image doesn't make any difference. The degree to which the format of the source video will affect the output varies depending on the codec and how it works. Effect of source video format on encoded output In some situations, a greater sacrifice of quality in order to bring down the data size is worth that lost quality other times, the loss of quality is unacceptable and it's necessary to accept a codec configuration that results in a correspondingly larger file. Thus, it's always a tradeoff of size versus quality. The simplest guideline is this: anything that makes the encoded video look more like the original, uncompressed, video will generally make the resulting data larger as well. Codec name (short)Īs is the case with any encoder, there are two basic groups of factors affecting the size and quality of the encoded video: specifics about the source video's format and contents, and the characteristics and configuration of the codec used while encoding the video. Each codec provides a link to a section below which offers additional details about the codec, including specific capabilities and compatibility issues you may need to be aware of. For each codec, the containers (file types) that can support them are also listed. The following video codecs are those which are most commonly used on the web. This guide introduces the video codecs you're most likely to encounter or consider using on the web, summaries of their capabilities and any compatibility and utility concerns, and advice to help you choose the right codec for your project's video. 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. 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).A single frame of high definition (1920x1080) video in full color (4 bytes per pixel) is 8,294,400 bytes.Imagine the amount of data needed to store uncompressed video: Due to the sheer size of uncompressed video data, it's necessary to compress it significantly in order to store it, let alone transmit it over a network. ![]()
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