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Merge pull request #11618 from alalek:ffmpeg_debug_log

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This commit is contained in:
Alexander Alekhin 2018-05-30 15:36:42 +00:00
commit 133e9f2012
1 changed files with 23 additions and 1 deletions
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24
modules/videoio/src/cap_ffmpeg_impl.hpp
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@ -754,6 +754,17 @@ private:
AutoLock& operator = (const AutoLock&); // disabled
};
static void ffmpeg_log_callback(void *ptr, int level, const char *fmt, va_list vargs)
{
static bool skip_header = false;
static int prev_level = -1;
(void)ptr;
if (!skip_header || level != prev_level) printf("[OPENCV:FFMPEG:%02d] ", level);
vprintf(fmt, vargs);
size_t fmt_len = strlen(fmt);
skip_header = fmt_len > 0 && fmt[fmt_len - 1] != '\n';
prev_level = level;
}
class InternalFFMpegRegister
{
@ -773,7 +784,18 @@ public:
/* register a callback function for synchronization */
av_lockmgr_register(&LockCallBack);
av_log_set_level(AV_LOG_ERROR);
#ifndef NO_GETENV
char* debug_option = getenv("OPENCV_FFMPEG_DEBUG");
if (debug_option != NULL)
{
av_log_set_level(AV_LOG_VERBOSE);
av_log_set_callback(ffmpeg_log_callback);
}
else
#endif
{
av_log_set_level(AV_LOG_ERROR);
}
_initialized = true;
}