Dear All,
I have written a wrapper function around ffmpeg.c's main to use it for some
decoding/encoding function.
As I am using it in MultiThreaded environment, I have done these changes to
make ffmpeg.c threadsafe:
1) I have made all global variables, local by putting them inside a big
structure, and passing it to all functions
2) I have put mutexes around these functions:
*
*
>
> * avcodec_register_all();
> avdevice_register_all();
> av_register_all();
> avcodec_open();
> avcodec_close();*
>
though doing this, If I use my wrapper function in two threads, I get the
following error:
*[NULL @ 0x20ef360]insufficient thread locking around avcodec_open/close()*
>
So, does anybody have an idea what is wrong with my actions that I still
have these errors.
Just for your reference, I have built ffmpeg under MinGW (in Windows).
And I have put the mutexes using pthreads, here is an example of how I put a
mutex around avcodec_open()
*pthread_mutex_lock (&mutex_avcodec_open1);*
> if (avcodec_open(ost->st->codec, codec) < 0) {
> fprintf(stderr, "Error while opening codec for output
> stream #%d.%d - maybe incorrect parameters such as bit_rate, rate, width or
> height\n",
> ost->file_index, ost->index);
> av_exit(1,global_var);
> }
> *pthread_mutex_unlock (&mutex_avcodec_open1);*
BRs,
Alireza
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