How can I turn libavformat error messages off?

Looking through the code, it appears you can change the behavior by writing your own callback function for the av_log function From the description of this function in libavutil/log. H : Send the specified message to the log if the level is less than or equal to the current av_log_level. By default, all logging messages are sent to stderr This behavior can be altered by setting a different av_vlog callback function The API provides a function that will allow you to define your own callback: void av_log_set_callback(void (*)(void*, int, const char*, va_list)) In your case, you could write a simple callback function that discards the messages altogether (or redirects them to a dedicated log, etc.) without tainting your stderr stream.

Looking through the code, it appears you can change the behavior by writing your own callback function for the av_log function. From the description of this function in libavutil/log. H: Send the specified message to the log if the level is less than or equal to the current av_log_level.

By default, all logging messages are sent to stderr. This behavior can be altered by setting a different av_vlog callback function. The API provides a function that will allow you to define your own callback: void av_log_set_callback(void (*)(void*, int, const char*, va_list)); In your case, you could write a simple callback function that discards the messages altogether (or redirects them to a dedicated log, etc.) without tainting your stderr stream.

2 Beat me to it. You can also use av_log_set_level(AV_LOG_QUIET) to quiet all logging. – Dan Cruz Oct 16 at 20:57.

You can redirect them to a custom file, it will redirect all cerr entry: #include #include using namespace std; int main() { ofstream file("file. Txt"); streambuf *old_cerr = cerr.rdbuf(); cerr. Rdbuf (file.rdbuf()); cerr Txt // ... cerr.

Rdbuf (old_cerr); // restore orginal cerr return 0; } Edit: After editing the question, I warn about above code that it will redirect all cerr entry stream to file. Txt I'm not familiar with libavformat, but if its code is unchangeable, you can temporary redirect cerr to a file before calling library's api and redirect it to original cerr again.(However this is ugly way).

... and all other cerr messages. I don't think that's what OP wanted. – VJo Oct 16 at 19:54 I updated my answer, and noticed about it.

Thank you. – Dennis Ritchie Oct 16 at 20:00.

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