在 FFmpeg/LibAV 中设置 RTSP/UDP 缓冲区大小 [英] Set RTSP/UDP buffer size in FFmpeg/LibAV
问题描述
注意:我知道 ffmpeg 和 libav 是不同的库.这是两者的共同问题.
Note: I'm aware ffmpeg and libav are different libraries. This is a problem common to both.
免责声明:SO 问题的重复 标记为已回答但实际上没有给出正确的解决方案.
Disclaimer: Duplicate of SO question marked as answered but actually didn't give a proper solution.
UDP 缓冲区大小不足会导致多个高分辨率视频流的流中断.在 LibAV/FFMPEG 中，可以通过附加一些 选项(缓冲区大小).
Insufficient UDP buffer size causes broken streams for several high resolution video streams. In LibAV/FFMPEG it's possible to set the udp buffer size for udp urls (udp://...) by appending some options (buffer_size) to it.
但是，对于 RTSP 网址，这是不支持.
However, for RTSP urls this is not supported.
这些是我找到的唯一解决方案:
These are the only solutions I've found:
- 重建 ffmpeg/libav 更改 udp.c 源文件中的 UDP_MAX_PKT_SIZE.
- 使用讨厌的黑客来查找和修改所需的值，通过转换一些私有结构.
- 使用不同的解码库(针对上述相关 SO 问题的建议解决方案).
- Rebuilding ffmpeg/libav changing the UDP_MAX_PKT_SIZE in the udp.c source file.
- Using a nasty hack to find and modify the required value, by casting some private structs.
- Using a different decoding library (proposed solution to aforementioned related SO question).
这些实际上都不是解决方案.从我发现应该可以使用 API 的 AVOptions 查找并设置此值.或者，AVDictionary.
None of these is actually a solution. From what I found it should be possible to use the API's AVOptions to find and set this value. Or else, the AVDictionary.
在 libav 或 ffmpeg 的整个文档中很难找到如何设置这些.
It's very difficult to find how to set these throughout the documentation of either libav or ffmpeg.
更新:
感谢 Libav 开发者 @lu_zero :
The following patches have been submited to Libav tackling this topic, thanks to Libav developer @lu_zero :
哪些应该提供有关如何实现这些的提示，但这些仍然无法通过官方稳定 API 获得.
Which should offer a hint on how to implement those, still these are not yet available through the official stable API.
推荐答案
自从 this 提交足以将 buffer_size 作为选项传递，并通过 rtp 转发到 udp 协议协议.
Since this commit it is enough to pass buffer_size as option and it gets forwarded to the udp protocol through the rtp protocol.
我测试过，它按预期工作.
I tested and it works as intended.
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