Django Presentations on Web Frameworks

Information about data, describing its content, structure, and other characteristics. It helps understand the context and meaning of the data.

An organization promoting open standards for describing online resources, like websites and documents.

The entity responsible for creating or contributing to the content of a resource.

Repeated patterns in data caused by the similarity of neighboring pixels.

Repeated patterns in consecutive frames of a video or animation.

Delivering media to a client in a continuous flow, enabling playback before the entire file is downloaded.

Downloading the entire media file before playback begins.

Downloading a media file while allowing playback to start as soon as the first part is available.

Factors to consider when deciding whether or not to stream media.

Not all media types are suitable for streaming. Some might require large parts to be downloaded first or streaming might not make sense for them.

The time it takes for data to travel from a server to a client, calculated as the sum of packet transmission time and node delays.

The variation in latency, affecting the consistency of data arrival and causing disruptions like buffering or quality loss during streaming.

Pre-loading a portion of the stream on the client's device to compensate for differences in play speed and stream speed, latency variation, and packet loss.

Embedding information into a digital signal (audio, image, video) to verify authenticity or ownership like a visible watermark on paper.

The identification and management of intellectual property rights associated with digital content, including ownership and usage permissions.

Watermark information embedded into a digital signal without noticeably altering the content.

Buffering compensates for differences in play speed and stream speed, latency variation, and packet loss.

Digital watermarking is used to verify the authenticity or ownership of digital content, similar to a visible watermark on paper.

A byte is made up of 8 bits. It's the standard unit for measuring file sizes.

Bits are the fundamental units of data, while bytes are groups of 8 bits used for larger data units like file sizes.

HTTP is designed for file transfers, not continuous data streams. It has high overhead and doesn't support real-time adjustments.

The extra data needed for communication using a protocol, like HTTP. It adds to the total data transferred.

The slowest link in a network route determines the overall bandwidth. This link can be limited by capacity and condition.

Latency is the delay in data transmission, mainly a problem for interactive feedback due to its effect on responsiveness.

Latency is affected by the bandwidth capacity of a route and delay at each node (like network devices).

Latency doesn't directly affect streaming, but it impacts the responsiveness of interactive features like chat.

Using links instead of storing binary data directly in a database simplifies data retrieval and management. Links act as references, similar to how HTML handles them.

A complete link that works from any location, both internally and externally. It provides full access to the resource.

A link that only works within a specific location or context, typically within the same website or directory. This is like a local address that works only within a specific town.

Metadata helps organize, search, and identify binary data. It provides essential information for understanding and managing multimedia content.

File name, date modified, CD title, artists, DVD chapters, subtitles, ISBN number, MP3 tags, and more.

Metadata can be categorized into different types of information such as language, title, encoding, type, author, distributor, index, content, and transcript.

Common examples of media metadata include title, creator, subject, description, publisher, and more.

Metadata helps us understand, organize, and find information related to a media file. It provides key context and details for effective usage and management.

A watermark that remains embedded in the media even after processing, compression, or format changes. The data size of the media stays the same before and after embedding.

A watermark added by Zoom to videos. It may be invisible, but remains even after some compression. The impact of compression on the watermark is minimal.

Digital watermarking helps protect copyright, trace transactions, monitor broadcasts, prevent tampering, detect piracy, and authenticate data.

Academy members receive movies for review, but some share them illegally. Copyright holders use watermarking to track and identify the source of unauthorized leaks.

A watermark can be embedded not just in a single frame, but across multiple frames of a video, enhancing its robustness.

Watermarks ideally should be unique to both the source and the participant accessing the content, making it easier to pinpoint the origin of a leak.

One way to create invisible watermarks is by slightly adjusting the RGB values of pixels to odd or even numbers, encoding a hidden identifier.

Steganography is the art of hiding secret messages within media, using techniques similar to watermarking, but with the primary goal of invisibility.