FlvParse is a desktop app which shows Flv file structures, supporting macOS/Windows/Linux. It could be used to show detailed information and binary data of various Flv tags and fields.
FlvParse是一款Flv文件分析工具，支持macOS/Windows/Linux，可以展示Flv各个包、字段的详细信息和二进制数据。
For macOS, an executable is available here.
For other OS,
git clone https://github.com/hunterwyld/FlvParse.git
cd FlvParse
mvn clean package
java -jar target/flvparse.jar
Note that JRE 1.7+ is required to run the app
Thanks to jar2app which makes it easy for converting a jar file to macOS app.