Definition:
- Video Compression is the process of encoding a video file in such a way that it consumes less space than the original file and is easier to transmit over the network/Internet.
- It is a type of compression technique that reduces the size of video file formats by eliminating redundant and non-functional data from the original video file.
- Video files are almost always compressed before being put on the web (or downloaded from the web ).
- Compression involves packing the file's information into a smaller space. This works through two different kinds of compression i.e, lossy and lossless.
- Lossy compression means that the compressed file has less data in it than the original file.
- Images and sounds that repeat throughout the video might be removed to effectively cut out parts of the video that seen as unneeded.
- In some cases, this translates to lower quality files because information has been "lost," hence the name.
- Lossy compression methods don't make pixel-by-pixel copies of the source at all.
- They work in several different ways, but the general result is the same.
- By making compression method can essentially turn a giant source file into something that takes up considerably less space and can be easily played back on a portable device.
Examples of Lossy Compression Technique:
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| Lossy Compressed Files |
Lossless Compression:
- Lossless Compression is a class of data compression algorithms that allows the original data to be perfectly reconstructed from the compressed data.
- The latest standard in video compressing is High Efficiency Video Coding(HEVC). This is said to double the amount of data compressed while retaining the same level of video quality.
- Over all, lossless compression is best for every stage of the editing process from capture to edits, but lossy compression formats are currently the best way to deliver high-quality video to your portable media player or to YouTube.
Examples of Lossless Compression Technique:
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| Lossless Compressed Files |
Advantages:
- Video file requires less storage space.
- File transferring is faster.
- Order of bytes is independent.
- Reading and writing the video files is faster.
Disadvantages:
- Complicated work process.
- Errors can occur during compression, transfer and streaming.
- Processing time to decompress the compressed file.