El 29/03/17 a las 09:45, Gonzalo Garramuño escribió:
I would like to use the PNG reader that comes with FFMPEG in my
program as it is multithreaded and quite fast. However, I don't know
how to set the starting frame number ( -start_number ) nor the length
of frames to read. Reading img2dec.c, I found out about
VideoDemuxData. Currently, the class VideoDemuxData is private to
libavformat, and is located in a private .h file (img2.h). So I am
stumped.
My question is: is there any way in libav to set the value of
-start_number or, more to the point, have the png reader start/end at
a particular frame?
Thanks in advance.
To answer my own question:
AVDictionary *opts = NULL;
av_dict_set(&opts, "initial_pause", "1", 0);
char buf[64];
sprintf( buf, "%" PRId64, _frameStart );
av_dict_set(&opts, "start_number", buf, 0);
AVInputFormat* format = NULL;
// We must open fileroot for png sequences to work
int error = avformat_open_input( &_context, fileroot(),
format, &opts );
--
Gonzalo Garramuño
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