Adding a string replace from “%td” to “%d” on the fmt string enables logging without issue, btw.
Sincerely, -Blake Senftner > On Dec 18, 2016, at 7:28 AM, Blake Senftner <[email protected]> wrote: > > Hello, > > I am working with ffmpeg libav* 3.2 libs, downloaded pre-built from Zeranoe > early November, my versions are: > > libavutil 55. 34.100 / 55. 34.100 > libavcodec 57. 64.100 / 57. 64.100 > libavformat 57. 56.100 / 57. 56.100 > libavdevice 57. 1.100 / 57. 1.100 > libavfilter 6. 65.100 / 6. 65.100 > libswscale 4. 2.100 / 4. 2.100 > libswresample 2. 3.100 / 2. 3.100 > libpostproc 54. 1.100 / 54. 1.100 > > I’m developing a video playback library, (no audio handling.) I started with > the Dranger tutorials, but have updated everything to the latest APIs from > reading here, and other sources. So far the code is having no problems > playing live USB video, or any video file I can find, but does not play IP > cameras delivering rtsp h264 streams correctly. The non-keyframes are very > blurry. Plus, for media files as well as rtsp streams, I can only get half > speed or lower playback. > > I’ll be posting a few questions about those issues later, but first I want to > ask about my implementation of an av_log callback, as I am getting crashes > from an “incorrect format specifier” delivered from the “h264” module. The > specific format string causing the crash is “error while decoding MB %d %d, > bytestream %td\n”. (Is the “t” size modifier valid in Visual Studio?) > > void CE_LIBAV_Video::logging_callback(void *ptr, int level, const char *fmt, > va_list vargs) > { > static char message[8192]; > const char *module = NULL; > > if (level > AV_LOG_WARNING) > return; > > // Get module name > if (ptr) > { > AVClass *avc = *(AVClass**) ptr; > module = avc->item_name(ptr); > } > > // Create the actual message > vsnprintf_s(message, sizeof(message), _TRUNCATE, fmt, vargs); > > ofstream log_file; > log_file.open( "libav.log", std::ios::app ); > log_file << message; > log_file.close(); > } > > Playing USB video, I see no av_log format specifier issues. Playing media > files, non-h264, I see no av_log issues, but when playing an h264 video file > I also see the same format specifier issue. > > I’m working in Win10, Visual Studio 2013 Community. > > Sincerely, > -Blake Senftner > Mad Computer Scientist > _______________________________________________ > Libav-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/libav-user _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
