answer:The OpenH264 project, which is an open-source implementation of the H.264 video codec, contains approximately 330,000 lines of code. However, please note that the line count can vary depending on how lines are counted (e.g., excluding comments or blank lines), and this estimate may change with updates and contributions to the project's codebase.

answer:The Opus audio codec project contains approximately 77,000 lines of code. However, please note that the line count can vary depending on how lines are counted (e.g., excluding comments or blank lines) and may change with updates and contributions to the project's codebase. It's important to consider that this line count is an estimate and may not account for external dependencies or additional components that may be included in the project.

answer:The PDFium project, which is an open-source PDF rendering engine, contains approximately 1.7 million lines of code. Please note that this line count can vary slightly depending on how lines are counted (e.g., excluding comments or blank lines), and it may change with updates and contributions to the project's codebase. It's important to consider that this line count is an estimate and covers the codebase of the project as a whole, including both the core functionality and supporting components.

answer:The pthreadpool project, which is a minimalist implementation of thread pooling in C, contains approximately 2,000 lines of code. Please note that this line count can vary slightly depending on how lines are counted (e.g., excluding comments or blank lines) and may change with updates and contributions to the project's codebase. It's important to consider that this line count is an estimate and covers the core functionality of the pthreadpool library.