Hi.
The different devices ffmpeg supports have different options, I am
interested in the 'list_formats' of the decklink devices. Using the
ffmpeg.exe tool the following command:
ffmpeg -f decklink -list_formats 1 -i 'Intensity Pro'
prints the formats that can be used with the device.
I want to recover this information from my program which uses the libav
libraries. My current solution looks like this.
std::string formatListing;
int main(int argc, char* argv[]) {
av_log_set_level(AV_LOG_VERBOSE);
av_log_set_callback(my_log_callback);
AVInputFormat* inpF = av_find_input_format("decklink");
AVFormatContext* ifmt_ctx = avformat_alloc_context();
AVDictionary* options = NULL;
av_dict_set(&options, "list_formats", "1", NULL);
avformat_open_input(&ifmt_ctx, deviceName.c_str(), inpF, &options);
........... // Parse the string in formatListing.
}
void my_log_callback(void *ptr, int level, const char *fmt, va_list vl) {
AVClass* avc = ptr ? *(AVClass **) ptr : NULL;
std::string className = avc ? avc->item_name(ptr) : "";
if (className == "decklink") {
char buf[500];
vsnprintf(buf, 500, fmt, vl);
formatListing += buf;
}
if (avc != NULL)
const char* aux = avc->item_name(ptr);
av_log_default_callback(ptr, level, fmt, vl);
}
This code works fine, but I don't like it. Is there a more elegant solution
to this which doesn't involve a log callback?
Thanks.
_______________________________________________
Libav-user mailing list
Libav-user@ffmpeg.org
http://ffmpeg.org/mailman/listinfo/libav-user
