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由于看不到ndk的源码, 所以有个问题请教 #5

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alexliyu7352 opened this issue Dec 16, 2018 · 7 comments
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由于看不到ndk的源码, 所以有个问题请教 #5

alexliyu7352 opened this issue Dec 16, 2018 · 7 comments

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@alexliyu7352
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你这里的应该也是修改了ffmpeg.c实现的cmd命令功能吧?
我想请教下, 如果多个线程执行. 怎么保证线程安全呢?
因为我看ffmpeg.c这个文件里面的main实际上并不是线程安全的,
也就是在java层只能阻塞调用或者队列调用命令.
没办法一次执行多个命令.是么?
@microshow
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如果要一次执行多条命令，可以开多个进程去实现的

@alexliyu7352
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java层多个进程, 还是直接在native层 fork出来

@microshow
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ndk层开启多进程可能在各个系统版本有些限制，为了保险起见建议可以用java层多进程，后续我会考虑在ndk层去实现支持多进程运行ffmpeg……

@alexliyu7352
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其实还是最好多线程实现, 因为多进程太重了, 况且android就算java层也有限制.
但是不知道如何多线程实现, 看来不能直接使用ffmpeg.c, 必须要自己重新封装transcode的代码.
也只有这个办法是么?

@microshow
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其实有试过在ndk层多线程去实现，但中断当前命令不太好优雅的中断，而且会引发比较多的问题

@microshow
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V1.2.0版本特性：提升转码效率，重新编译ffmpeg,修复拼接视频出错的bug,支持更多格式，包括支持mp3,aac,wav等格式的音频导出，丰富了更多功能，欢迎更新！

@Adolphsa Adolphsa mentioned this issue Mar 14, 2019
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@microshow
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可以更新V2.0.0版本，速度嗖嗖的

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@microshow @alexliyu7352