This article is translated from TI's Handbook, the Handbook is a study of gpp+dsp development of the Golden Code document, I hope that the introduction of the help, there is an inappropriate understanding of the hope please enlighten.Codec Engine Application Developer User ' s Guide.pdf (literature number:sprue67d)"Codec Engine Application Development Manual" http://blog.csdn.net/dyzok88/article/details/42154487Chapter One
, branded default is Chromium, so, proprietary_codecs default is False.
Want to go, had to pass GN Gen when passed into the args to adjust the more convenient, use the following command to generate the Ninja build file:
GN Gen Out/h264debug--args= "Proprietary_codecs=true"
Once executed, you can use the following command to verify:
GN args Out/h264debug--list=proprietary_codecs
gn args Out/h264debug--list=rtc_use_h264
Seeing that current Value is true indicates that this option is already in
Dm6446 codec engine problems
Question 1:
The following error occurs in the encodedecode example of running demos in davinci_evm dm6446:
Encodedecode Debug: pal selectedEncode-Decode demo started!
Encodedecode Debug: codec engine initialized!
Traceutil> error: failed to open codec engine "encodedecode"
This problem occurs because the running program is not in the
Category:
Video coding and decoding Technology
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FFmpeg provides many encoder and decoder. For details, see the enumerated variable codecid in avcodec. h.
Macro definition
# Define register_encoder (x, x ){/Extern avcodec x ##_ encoder ;/If (# x ###_ encoder) avcodec_register ( X ##_ encoder );}
# Define register_decoder (x, x ){/Extern avcodec x ##_ decoder ;/If (# codec_id _ # X #) avcodec_register ( X ##_ decoder );}
For example:
Register_decoder (h2
This article is the source code of their own reading a bit of summary. Please specify the source for the transfer.Welcome to communicate with you.qq:1037701636 Email:[email protected]Android source code version number version:4.2.2; Hardware platform Full Chi A31The reason why this piece of content is extracted separately is that it has a certain level, the structure is unified, the API function design needs to implement the interface unique to OMX architecture.1. In the previous post Android4.2
koi8-r encoded string and wants to convert it to Unicode. The simple approach is to:qbytearray encodedstring = "...";qtextcodec*codec=qtextcodec:: Codecforname ("Koi8-r");QString string = Codec->tounicode (encodedstring);Thereafter, the text string is converted to Unicode. It is also simple to convert a Unicode string into a locally encoded string:QString string = "...";Qtextcodec qtextcodec:: Codecforname
probabilities
Visual redundancy: The human visual system is insensitive to certain details
Knowledge Redundancy: The structure of regularity can be obtained by a priori knowledge of Beijing knowledge
4. Data compression classificationLossless compression (Lossless)
The image is exactly the same after decompression
Low compression ratio (2:1~3:1)
such as: WINZIP,JPEG-LG
lossy compression (Lossy)
Image inconsistency after decompression before compressio
JPEG codec is used for compresses original raw image and decompresses original JPEG image. This hardware circuit performs all the functions required for compression/Decompression: discrete cosine transformation, quantization, and Hoffmann encoding.
Encoding function:
Input raw image: Format: ycbcr4: 2: 2, rgb565
Output JPEG file: Baseline JPEG, Color Space: ycbcr4: 2: 2 or ycbcr4: 2: 0
The progressive mode is not supported.
Decoding function:
Input
First, the concept
The unit of the network transmission is bytes, how to convert the application's data to bytes, and the conversion of bytes to the data of the application, it is necessary to mention the encoder and decoder we introduced in this article.
The components that convert the application's data to a network format and the data that transforms the network format into an application are called encoders and decoders, and a single component with both features is called a
default is Chromium, so, proprietary_codecs default is False.Want to go, had to pass GN Gen when passed into the args to adjust the more convenient, use the following command to generate the Ninja build file:gn gen out/h264Debug --args="proprietary_codecs=true"Once executed, you can use the following command to verify:gn args out/h264Debug --list=proprietary_codecsgn args out/h264Debug --list=rtc_use_h264Seeing that current Value is true indicates that this option is already in effect.Open rtc_
Encoding and decoding, or the conversion of data from one specific protocol format to another format. These tasks are handled by components that are commonly referred to as codecs. Netty provides a variety of components that simplify the process of creating a custom codec to support a wide range of protocols. For example, if you are building a Netty-based mail server, you will find that Netty's support for codecs is invaluable for implementing POP3, I
period of time, contact with a lot of people in the same industry, especially the use of FFmpeg audio codec, some have many years of experience in the "Great God", some have just started to learn beginners. In the process of discussing with you, I suddenly found a problem: there seems to be an insurmountable gap between the "great God" and the beginner. The "Great God" is highly skilled and explores esoteric issues, while beginners remain at the intr
Media services are the main services of the network. Especially with the rise of mobile Internet businesses, among operators and application developers, media businesses are extremely heavy. The media codec service involves demand analysis, application development, and license release charges. Recently, due to the project relationship, we need to clarify the media codec. What we do is to look at the specifi
As we thought, what should I do if the content of a text cannot be parsed at a time? The answer is to use an object to save these unresolved objects for parsing. This object is generally stored in the session.
1. Text Encoder
Package COM. boonya. protocol. codec. self; import Java. NIO. charset. charset; import Org. apache. mina. core. buffer. iobuffer; import Org. apache. mina. core. session. iosession; import Org. apache. mina. filter.
Low compression ratio (2:1~3:1)
Example: Winzip,jpeg-ls
lossy compression (Lossy)
Image inconsistency after decompression before compression x≠x '
Compression ratio (10:1~20:1)
Using the characteristics of human visual systems
Example: Mpeg-2,h.264/avc,avs
4. codec
Encoder (Encoder)
A device or program that compresses a signal.
Decoder (Decoder)
A d
retransmission.
Common video coding and decoding standards
Many video codecs can be easily implemented on personal computers and consumer electronics, which makes it possible to implement a variety of video codecs at the same time, which avoids the fact that some dominant codec affects the development and promotion of other codecs due to compatibility. Finally, we can say that there is no such codec
Originally did a very long time audio and video codec things, should do a summary. Here is about the audio and video coding This kind of work gains and losses and trade-offs, in fact, the main is to give up, there is no reason, right when a listen. Let the readers judge for themselves.Take video coding standard H., this is a good thing, after the standardization of video coding, compatibility issues "by laws", conducive to film, video and other dissem
The Application of fo-dicom in AspNet WebApi throws an exception: No codec registered for tranfer syntax:, webapifo-dicomBackground: In a Dicom Web Service, the WADO-RS needs to parse TransferSyntax, and then the DicomFile. ChangeTransferSyntax method in fo-dicom is used. Code similar to: var df = DicomFile. Open (samplesDir + @ "\ User Submitted \ overlays. dcm"); df = df. ChangeTransferSyntax (DicomTransferSyntax. 2000lossless );Problem: The above c
"H.264/AVC Video codec technology specific explanation" video tutorial has been in the "CSDN College" on-line, the video details of the background, standard protocol and implementation, and through a practical project in the form of the standard of H. A to analyze and realize, welcome to watch! "The paper is finally light. I know this matter to be preach. " Only have their own in accordance with the standard document in the form of code, the ability o
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