barcode in vb.net Video and Audio Compression in Software

Generating ANSI/AIM Code 128 in Software Video and Audio Compression

Video and Audio Compression
Code-128 Decoder In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Code-128 Drawer In None
Using Barcode encoder for Software Control to generate, create Code 128 Code Set B image in Software applications.
In general, it is not possible to hide artifacts by up-sampling from a low-quality, highly compressed stream to a higher quality one. Concatenation artifacts persist and propagate. Hence, there is a need to archive streaming media masters using high quality, losslessly compressed formats, ideally. This will allow the media assets to be reformatted and repurposed in the future. Also, the overall quality of the production chain is only as good as the worst quality compression system in the chain. If any upstream stage in the process is very lossy, things can only get worse downstream.
Code 128C Scanner In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
Make Code 128 Code Set A In C#.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create Code 128 Code Set A image in Visual Studio .NET applications.
Typical MPEG Artifacts
Code 128B Generation In Visual Studio .NET
Using Barcode drawer for ASP.NET Control to generate, create Code 128B image in ASP.NET applications.
Make Code 128C In VS .NET
Using Barcode maker for VS .NET Control to generate, create Code 128B image in .NET applications.
Although each type of program material consists of a unique set of video characteristics, some generalizations concerning the artifacts that can be expected with MPEG-based compression systems can be made [13]. The artifacts are determined in large part by the algorithm implementations used by specific MPEG encoding vendors. Possible artifacts include the following:
Code 128 Code Set C Generator In Visual Basic .NET
Using Barcode drawer for VS .NET Control to generate, create Code 128A image in VS .NET applications.
USS-128 Creation In None
Using Barcode creation for Software Control to generate, create UCC - 12 image in Software applications.
Block effects These may be seen when the eye tracks a fast-moving, detailed object across the screen. The blocky grid appears to remain fixed while the object moves beneath it. This effect also may be seen during dissolves and fades. It typically is caused by poor motion estimation and/or insufficient allocation of bits in the coder. Mosquito noise This artifact may be seen at the edges of text, logos, and other sharply defined objects. The sharp edges cause highfrequency DCT terms, which are coarsely quantized and spread spatially when transformed back into the pixel domain. Dirty window This condition appears as streaking noise that remains stationary while objects move beneath it. In this case, the encoder may not be sending sufficient bits to code the residual (prediction) error in the P- and B-frames. Wavy noise This artifact often is seen during slow pans across highly detailed scenes, such as a crowd in a stadium. The coarsely quantized high-frequency terms resulting from such images can cause reconstruction errors to modulate spatially as details shift within the DCT blocks.
Code 39 Creator In None
Using Barcode printer for Software Control to generate, create Code39 image in Software applications.
GS1 - 12 Generator In None
Using Barcode drawer for Software Control to generate, create UCC - 12 image in Software applications.
Appendix E
Bar Code Creator In None
Using Barcode printer for Software Control to generate, create barcode image in Software applications.
GTIN - 13 Generator In None
Using Barcode encoder for Software Control to generate, create EAN-13 image in Software applications.
It follows, then, that certain types of motion do not fit the MPEG linear translation model particularly well and are, therefore, problematic. These types of motion include:
Code11 Generator In None
Using Barcode printer for Software Control to generate, create USD - 8 image in Software applications.
EAN / UCC - 13 Drawer In None
Using Barcode creation for Font Control to generate, create EAN / UCC - 13 image in Font applications.
Zooms Rotations Transparent and/or translucent moving objects Dissolves containing moving objects
Bar Code Reader In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
Encode Bar Code In .NET Framework
Using Barcode creation for ASP.NET Control to generate, create bar code image in ASP.NET applications.
Furthermore, certain types of image elements cannot be predicted well. These image elements include:
UPC-A Recognizer In C#.NET
Using Barcode reader for .NET Control to read, scan read, scan image in .NET framework applications.
Code 39 Full ASCII Creator In Java
Using Barcode printer for Java Control to generate, create Code-39 image in Java applications.
Shadows Changes in brightness resulting from fade-ins and fade-outs Highly detailed regions Noise effects Additive noise
Reading Barcode In .NET Framework
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
Drawing Code 128C In None
Using Barcode creator for Online Control to generate, create Code 128A image in Online applications.
Efforts continue to minimize coding artifacts. Success lies in the skill of the system designers in adjusting the many operating parameters of a video encoder. One of the strengths of the MPEG standard is that it allows and even encourages diversity and innovation in encoder design.
SMPTE RP202
SMPTE Recommended Practice 202 is an important step in the world of digital video production. Equipment conforming to this practice will minimize concatenation artifacts by optimizing macroblock alignment [14]. As MPEG compression becomes pervasive, multiple compression and decompression cycles will inevitably occur. Concatenation of codecs may be needed for production, post-production, transcoding, and format conversion. Any time video transitions to or from the coefficient domain of MPEG are performed, care must be exercised on alignment of the video, both horizontally and vertically, as it is coded from the raster format or decoded and placed in the raster format. The first problem is shifting the video horizontally and vertically. Over multiple compression and decompression cycles, this could substantially distort the image. Less obvious, but just as important, is the need for macroblock alignment to reduce artifacts between encoders and
Video and Audio Compression
TABLE E.4 Recommended MPEG-2 Coding Ranges for Various Video Fromats (After [14])
Resolution Format 480I 480P 512I
AM FL Y
Coded pels Field 1 480 0 719 23 262 480 0 719 0 719 0 719 0 719 0 719 0 1279 0 1279 0 1919 0 1919 0 1919 0 1919 21 560 21 560 23 310 7 310 7 262 512 512 576 608 720 720 10881 10881 10881 10881
decoders from various equipment vendors. If concatenated encoders do not share common macroblock boundaries, then additional quantization noise, motion estimation errors, and poor mode decisions may result. Likewise, encoding decisions that may be carried through the production and post-production process with recoding data present will rely upon macroblock alignment. Decoders must also exercise caution in the placement of the active video in the scanning format so that the downstream encoder does not receive an offset image. With these issues in mind, RP202 specifies the spatial alignment for MPEG-2 video encoders and decoders. Both standard definition and high definition video formats for production, distribution, and emission systems are addressed. Table E.4 gives the recommended coding ranges for MPEG-2 encoders and decoders. Although not specifically addressed in the practice, MPEG-4 streaming media encoders that take input from a MPEG-2 production plant could also benefit from macroblock and spatial alignment.
Coded lines MPEG-2 profile Frame and level MP @ML 46 525 270 525 14 525 336 623 320 623 26 745 26 745 584 1123 584 1123 42 1121 42 1121 MP @ HL 422P @ ML 422P @ HL MP @ ML 422P @ ML MP @ HL 422P @ HL MP @ HL 422P @ HL MP @ HL 422P @ HL
Copyright © OnBarcode.com . All rights reserved.