1. Support Java/log4j log level text. 2. Support configuring by `--log-new-level=on` which is enabled by default. 3. Support `--log-new-level=off` to use SRS 4.0 log level for compatibility.
The reference docs.
SRS 4.0 English
SRS 4.0 中文文档
SRS 5.0 English
SRS 5.0 中文文档
Winlin