Tagged: Codec

MPEG数据流的分辨及用途

ES是基本数据流(elementary stream):用于某些硬盘播或编辑系统,如m2v

PS是程序数据流(program stream):用于播放或编辑系统,如m2p

TS是传输数据流(transition stream):主要用于数据传输,如HDV机器内部记录的m2t

ES首先需打包成PES流包,然后PES根据需要打包成PS或TS包进行存储或传输。其每路ES只包含一路信源的编码数据流,所以每路PES也只包含相对应信源的数据流。

对PS流而言,每个PES包头含有PTS和DTS,流识别码,用于区别不同性质ES。然后通过PS复用器将PES包复用成PS包。实际上是将PES包分解为更细小的PS包。在解码的时候,解复用器将PS分解成一个个PES包,拆包器然后将PES包拆成视频和音频的ES,最后输入至各自解码器进行解码。

一个问题是:各个ES在解码时,如何保证视音频的同步呢?除了PTS和DTS的配合工作外,还有一个重要的参数是SCR(system clock reference)。在编码的时候,PTS,DTS和SCR都是由STC(system time clock)生成的,在解码时,STC会再生,并通过锁相环路(PLL-phase lock loop),用本地SCR相位与输入的瞬时SCR相位锁相比较,以确定解码过程是否同步,若不同步,则用这个瞬时SCR调整27MHz的本地时钟频率。最后,PTS,DTS和SCR一起配合,解决视音频同步播放的问题。 Read more

实战解决edius6.x无法导入apple mov格式

之前由于很少使用mov格式,所以一直未能注意这个问题,昨天客户到公司修改片子,其中需要用到mov的素材,多次导入无法识别,以为是quicktime的问题,安装了多个版本问题依旧.网上搜索发现这个问题很多人遇到了,因此想到了之前家里的电脑安装的是qt-lite这个quicktime的插件,试着安装试一下的态度,结果还是可行的.

1.卸载电脑中已存在的quicktime版本.

2.下载qt-lite:http://www.free-codecs.com/download/QT_Lite.htm

3.安装下载的qt lite程序。

4.如果需要在浏览器使用qt插件可以注册它。以得到更多的功能。

注册信息:

Name: Dawn M Fredette
机构:shanghai
S/N: 4UJ2-5NLF-HFFA-9JW3-X2KV

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Canopus Playback Codecs Pack Ver:3.03

ABOUT CANOPUS CODECS

Canopus has long been regarded as a leader in video codec technology. These codecs are developed exclusively and innovatively by Canopus engineering team.High-speed codecs for video editing and conversion are the core of Canopus products, and are also known as a important foundamental technology by other well-known brands.

INSTALLATION & UNINSTALLATION

Install
Double-clicking 'setup.exe'icon in this software.

Uninstall
Selecting "Canopus Codec Option" and clicking 'Change/Remove' button via [Start] > [Control Panel] > [Add or Remove Programs].

OPERATION & LIMITATIONS
Installing this software, the following codecs are installed to your system.

  • Canopus DV Codec
  • Canopus Lossless Codec
  • Canopus HQ Codec
  • Canopus HQX Codec

These codecs are DECODE-ONLY and enable you to VIEW files created by EDIUS Pro or Broadcast editing software with using Microsoft Windows Media Player. Read more

Canopus Codec Option Ver:3.02

ABOUT CANOPUS CODECS
Canopus has long been regarded as a leader in video codec technology.Developed exclusively by the Canopus engineering team, innovative high-quality,high-speed codecs for video editing and conversion are at the heart of Canopus products, and are also licensed for use by other well-known brands.

LICENSE AGREEMENT
Please read the Software License Agreement before using this software.Do not use this software if you do not agree to the terms of this License Agreement.

INSTALLATION & UNINSTALLATION
Install by double-clicking 'setup.exe' in the folder Canopus Codec Option Ver 3.00
Uninstall via the [Control Panel] > [Add/Remove Applications].

OPERATION & LIMITATIONS
This software will install the following codecs:

  1. CANOPUS DV CODEC
  2. CANOPUS LOSSLESS CODEC
  3. CANOPUS HQ CODEC

These codecs are DECODE-ONLY, enabling you to VIEW files created by EDIUS Pro or Broadcast editing software, using Microsoft Windows Media Player. Read more

AC3 Filter 1.63b

C3Filter is high quality freeware DirectShow audio decoder and processor filter used to decode audio tracks in movies (DVD, MPEG4 and others). It has a priority on wide functionality and convenient settings.

AC3 Filter can decode following audio formats: AC3 / DTS / MPEG Audio. It also supports multi-channel and digital (SPDIF) outputs.

Features of AC3 Filter 1.63 :

  • Decoding of AC3/DTS/MPEG1/2 Audio Layer I/II formats
  • Support of DVD, AVI/AC3, AVI/DTS, WAV/AC3 and WAV/DTS
  • Audio processing for any source
  • Decomposition of any source to 6 channels
  • Full information about audio track format
  • Support of SPDIF passthrough mode
  • Multi-channel audio output from all sources on SPDIF (on-the-fly AC3 encoding)
  • Per-channel amplification for all input/output channels
  • Per-channel delays (for compensation of distance difference to speakers)
  • Automatic gain control
  • Clipping
  • Dynamic Range Compression, DRC
  • Level indication for input and output channels
  • Matrix mixer and ability of direct modification of mixing matrix
  • Dolby Surround / Pro Logic / Pro Logic II downmix

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QuickTime Alternative 3.1.1

QuickTime Alternative will allow you to play QuickTime files (.mov, .qt, .3gp and other extensions) without having to install the official QuickTime Player. It also supports QuickTime content that is embedded in webpages.

As a bonus, Internet Explorer will play all QuickTime movies that are embedded in a webpage. You do need a media player that is capable of playing QuickTime files. The included Media Player Classic supports it and works very well. The QuickTime Browser plugin supports Internet Explorer, Opera, Netscape and Mozilla. The QuickTime plugins include iPIX and QuickTimeVR.

Some advantages compared to QuickTime player :

  1. Quick and easy install
  2. It's easy to make an unattended installation
  3. No background processes
  4. Use a player of your own choice
  5. Low on resources
  6. Smaller size

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