在多线程中使用FFMPEG解码h264文件时出错？

Question

I write the code for decoding many .flv video files. Each video file is decoded by a separate thread. When I try on 1 thread, everything is ok. But when I try on more than 2 threads, it always occurs the error "insufficient thread locking around avcodec_open/close()".

I have searched and I know the functions avcodec_open() and avcodec_close() is not thread safe. And after that, I putted the mutex locking at anywhere that two that functions are called.

lockObj.Lock();
avcodec_open/close();
lockObj.UnLock();

But the error "insufficient thread locking around avcodec_open/close()" is still happen.

Someone can tell me the solution?

Many thanks,

T&TGroup

Answer 1

Is lockObj the same object in every thread?

The point of the mutex is to stop more than one thread from calling avcodec_open() at the same time. The other threads should stop and wait when they get to the lockObj.Lock() statement until the first thread calls lockObj.UnLock() . This is not possible if each thread has its own lockObj .

I have used this method with a QMutex (from Qt), so I know it is possible.