First of all we need to understand what CODEC means. It is Coder + Decoder = Codec, which is the encoder decoder. That is, the encoder is also the decoder.Website address: http://commons.apache.org/proper/commons-codec/Apache Commons Codec (TM) software provides implementations of common encoders and decoders such as B
From Wikipedia, the free encyclopedia
Internet Speech Audio Codec (iSAC)
Internet media type
audio/isac[1]
Developed
Global IP Solutions, nowGoogle Inc
Type of format
Audio compression format
ISAC Codec
Developer (s)
Global IP Solutions, nowGoogle Inc
Written in
C
Operating system
Cross-platform
Type
Au
Thank the great God to share, although now still do not understand, keep everyone together to seePS: A lot of people don't know how to read "FFmpeg". It reads "EF EF em Peg"0. Background knowledgeThis chapter focuses on where ffmpeg are used (here are just a few of the many I know, in fact much more than this). To illustrate: FFmpeg is very important.Use FFmpeg as the kernel video player:
Mplayer,ffplay, shooter player, Storm av, kmplayer,qq av ...
Use FFmpeg as the DirectShow Filt
2013-11-16 00:04 45621 people read reviews (231) Favorites report FFmpeg Coding and decoding learningDirectory (?) [+]Directory (?) [+]In the CSDN on this 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 in
In the CSDN on this 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
"H.264/AVC Video Codec Technology detailed" 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 the resolution and implementation of H. A, Welcome to watch! "The paper came to the end of shallow, I know this matter to preach", only by themselves in accordance with the standard document in the form of code to oper
"H.264/AVC Video Codec Technology detailed" 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 the resolution and implementation of H. A, Welcome to watch! "The paper came to the end of shallow, I know this matter to preach", only by themselves in accordance with the standard document in the form of code to oper
"H.264/AVC Video codec technology specific explanation" video tutorial has been on the "CSDN College" on-line. The video details the background, standard protocol and implementation, and through a real project in the form of the standard of the resolution and implementation, welcome to watch! "The paper came to light, I know this matter to preach." Only have their own in accordance with the standard document in the form of code, the ability of the vid
-8 to encode Chinese characters. 2.python encoding and decoding of characters
Character encoding/decoding function:
1 Unicode: This is Python's built-in function, located in the Unicode class.
Unicode (string [, encoding[, Errors]])-> object
The purpose of this function is to encode a string as a Unicode object in encoding format.
Omitting parameters will be decoded with Python's default ASCII
2) Decode: is located in the Unicode class.
Decode (...)| S.decode ([encoding[,errors]])-> string or
After multimedia files are parsed, you need to find the appropriate codec according to mime. 2.3 of the system has two methods: SoftwareCodec and omx node codec. The latter can be optimized with special hardware, the former seems to be relatively standard soft decoding.Below is the codeOmxcodec. cppOmxcodec: createVector FindMatchingCodecs (Mime, createEncoder, matchComponentName, flags, matchingCodecs );I
ProblemA Web page has been obtained in Python:http://blog.csdn.net/hfahe/article/details/5494895The HTML source code, its time UTF-8 encoded.Extract its title section: Title text in:
Speech at the Beijing Perl Conference-using Mason to develop high-performance Web sites
Then use:
Titleuni = Unicode (titlehtml, "Utf-8″");
Or
Titleuni = Titlehtml.decode ("Utf-8″");
Decodes it to Unicode, but it makes an error:
I have summarized the commonly used ITU speech codec for your reference:
1. g.711: pulse code modulation (PCM) of voice Frequencies
Encoding type: Expanded PCMEncoding rate: 64 Kbps
Theoretical latency: the time for processing a sample (1/8000 seconds = 0.125 milliseconds );
Sound Quality: Long Distance quality;Advantages: Low algorithm complexity, low compression ratio (CD sound quality> 400 Kbps), minimum codec
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
Video is an important part of Multimedia Systems in computers. To meet the needs of video storage, people have set different video file formats to put the video and audio in one file for simultaneous playback. Video files are actually a container that contains different tracks. The Container formats used are related to the scalability of video files.
FourCC is the Four-Character Codes. It consists of 4 characters (4 bytes) and is a Four-byte format that uniquely identifies the video data stream,
After reading the introduction of H264/AVC codec, I just left the following three articles in my mind:1, H264 does not understand how to implement a codec, just a coded video bit stream syntax, and the Bitstream decoding method, this is similar to MPEG.2, H264 and once the standard (such as H261, H263, MPEG-1, MPEG-4) codec implementation process is not much diff
UnicodeDecodeError: 'utf-8 'codec can' t decode byte 0xce in position 52: invalid continuation byte, continuation
Code:
df_w = pd.read_table( r'C:\Users\lab\Desktop\web_list_n.txt', sep=',', header=None)
This error occurs when I use the read_table method of pandas to read local files:
UnicodeDecodeError: 'utf-8 'codec can' t decode byte 0xce in position 52: invalid continuation byte
Query and find the t
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