How to systematically learn audio and video technology

1. Introduction to audio and video technology

Audio and video technology refers to digital media technology involving audio and video, which is usually used in multimedia production, transmission and playback. The following is an introduction to some common audio and video technologies:

1. Sound sampling and encoding: Convert sound into digital signals and compress them for easy storage, transmission, and processing. Commonly used encoding formats include MP3, AAC, WMA, FLAC, etc.

2. Video capture and encoding: Convert video signals into digital signals and perform compression encoding, usually using H.264, AVC, MPEG-2, MPEG-4 and other encoding formats.

3. Multimedia container format: Container format is a file format that packages audio, video and related information together. Common container formats include AVI, MP4, FLV, MKV, etc.

4. Streaming media transmission protocol: Protocol used to transmit audio and video streams, including RTSP, RTMP, HLS, HTTP, etc.

5. Video processing technology: including video editing, color correction, special effects and other technologies. Commonly used video processing software include Adobe Premiere, Final Cut Pro, etc.

6. Sound processing technology: including audio editing, sound effects processing, mixing and other technologies. Commonly used audio processing software includes Adobe Audition, Audacity, etc.

7. Virtual reality technology: Using computer graphics and simulation technology to create a virtual environment that users can interact with. Commonly used virtual reality technologies include VR (virtual reality), AR (augmented reality), etc.

In addition, with the continuous advancement and development of technology, audio and video technology will also continue to innovate and develop.

2. Preparation before studying

Learning audio and video technology requires mastering certain theoretical knowledge and technical practical experience. Here are some suggestions:

1. Learn the basic theoretical knowledge of audio and video, including audio and video encoding, transmission, processing and playback. In addition to some classic textbooks and academic papers, you can also refer to some official documents and tutorials, such as "FFmpeg Official Documentation" , "JavaCV Getting Started Tutorial" , "JavaCV Development Practical Tutorial" , "JavaCV Audio and Video Practical Guide" ( The latest JavaCV tutorial in 2022)" , "Digital Video Processing", "Basics of Multimedia Technology", "H.264/AVC Standard Analysis", etc.

2. Learn audio and video standards and understand the characteristics and application scenarios of different standards. For example, H.264 is the most commonly used video coding standard, and AAC is the commonly used audio coding standard.

3. Master audio and video programming techniques, including using various programming languages ​​and frameworks for audio and video development. For example, FFmpeg is a commonly used audio and video processing framework, GStreamer is also an open source streaming media processing framework, and OpenCV can be used to process video images and so on.

4. Learn how to use audio and video processing tools, such as Adobe Premiere Pro, Final Cut Pro, etc.

5. Attend some audio and video related courses or training, or join some audio and video technology communities, such as audio and video open source projects in GitHub, etc.

6. Get more hands-on practice and try to develop some audio and video applications, such as audio and video editors, audio and video players, live broadcast clients, etc., and gradually master the skills through practice.

In short, learning audio and video technology requires long-term persistence and hard work, and requires continuous learning, practice and exploration.

3. Specific operations during learning

1. Steps to establish audio and video technology foundation:

• Understand the basic concepts of audio and video, such as sampling rate, bit rate, codec, etc.
• Learn audio and video programming languages, such as C/C++, Java, etc., and understand basic syntax and common audio and video and image processing libraries such as FFmpeg, OpenCV, and JavaCV.
• Master the basic principles and common technologies of audio and video collection, processing and playback, such as microphones, cameras, noise processing, filtering, etc.
• Learn the basic principles of audio and video encoding and decoding, and understand common audio and video encoding formats, such as MP3, H.264, H265, AV1, etc.
• Master the basic technologies and protocols for audio and video transmission over the network, such as RTSP, RTP, RTMP, HLS, FLV and WebRTC, etc.

2. Methods to organize and summarize audio and video technology:

• Establish your own study note system to record important knowledge points and technical details, such as using Markdown format text files or professional note-taking software.
• Organize the corresponding example codes and application cases of actual scenarios to make the knowledge points more practical.
• Participate in relevant technical communities and discussion groups to communicate with other professionals and gain new technical knowledge and solutions.
• Continuously test, experiment and practice, deepen your understanding of knowledge points through actual operations, and constantly improve your skills and knowledge system.

4. How to consolidate learning

If you want to systematically and clearly form the audio and video technology knowledge system, consolidate and facilitate the review of audio and video technology, you can refer to the following steps:

1. Determine the direction of learning: Audio and video technology covers a wide range of areas, including audio processing, video encoding, streaming media transmission, etc. Beginners should first clarify the direction and goals they want to learn.

2. Learn basic concepts: Before understanding the technology in a specific field, you must first understand some basic concepts, such as: audio frequency, waveform, sound pressure level, pulse code modulation (PCM), etc.

3. Learn technical details: Choose the corresponding technology according to your own direction for in-depth study. For example, when learning audio, you can understand sound sampling, quantization, compression, noise reduction and other technologies. When learning video, you can understand video coding theory, video format, and video compression algorithm. and other technologies.

4. Practical application: After learning theoretical knowledge, it is necessary to carry out practical application and deepen the understanding of technology through some practical projects.

5. Learn new technologies: Audio and video technology is constantly updated and iterated. In order to keep up with the development of technology, beginners also need to constantly learn new technologies.

6. Reference learning resources: You can learn and understand audio and video technical knowledge by reading books, learning videos, referring to online documents, participating in technical communities, etc. For example, for Java audio and video development technology, you can refer to the following columns: "JavaCV Getting Started Tutorial" , "JavaCV Development Practical Tutorial" , "JavaCV Audio and Video Practical Guide (Latest JavaCV Tutorial in 2022)"