基于LGPL协议的FFmpeg能力：能否实现RTSP转推（音视频直接复制）功能？

Yes, you absolutely can implement this RTSP stream forwarding functionality using only FFmpeg's LGPL-licensed parts. Let me break down why this works:

Your command's core behavior #

Your target command is a stream copy operation:

ffmpeg.exe -i rtsp://xxx -vcodec copy -acodec copy -f rtsp rtsp://xxx

This mode tells FFmpeg to pass input audio and video streams directly to the output without decoding or re-encoding them. Here’s what happens under the hood, all relying on LGPL components:

• libavformat (LGPL): Handles reading the input RTSP stream, parsing its container format, and extracting raw media packets.
• libavutil (LGPL): Provides lightweight utility functions for packet handling and basic format conversion (no encoding/decoding involved here).
• libavformat (again LGPL): Takes the raw packets, wraps them into the output RTSP stream’s format, and sends them to the target URL.

Key considerations to confirm #

• Since you’re using -vcodec copy and -acodec copy, you never interact with FFmpeg’s GPL-licensed encoders or decoders. Those components are only required when you need to transcode media (e.g., change codec, resolution, or bitrate).
• As long as the input and output RTSP streams use compatible container/stream formats (which is almost always true for straight RTSP forwarding), no re-encapsulation logic requiring GPL components will be triggered.

Final verdict #

This exact stream copy use case is fully supported by FFmpeg’s LGPL-licensed libraries. You don’t need to include any GPL components in your implementation.

内容的提问来源于stack exchange，提问作者Nabui