On 8/13/13, Andrey Mochenov <[email protected]> wrote: > Hi gentlemen, > > We are using FFmpeg libraries git-ee94362 libavformat v55.2.100. > We are trying to write a simple HLS code example based on muxing.c standard > one. > Let be two input streams, video and audio (they can be synthetic, doesn't > matter). > Our purpose is to mux them into M3U8 playlist using HLS. > Suppose, duration of every TS segment file be 3 sec, and the desirable > maximum number of entries in M3U8 output file be 100. > From the FFmpeg application sources, one can see that the Apple HTTP Live > Streaming segmenter implemented in hlsenc.c file. > And the relevant options there are, as well: "hls_list_size", "hls_time", > etc. > The problem is that we have not succeeded to set/get/find these options in > a conventional way, as shown in the following code: > > // Here is a part of main() program > int64_t i1 = 0; > void *target_obj; > AVFormatContext *ofmt_ctx = NULL; > AVOutputFormat *ofmt = NULL; > > avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, "Example_Out.m3u8"); > ofmt = ofmt_ctx->oformat; > > // The relevant options ("hls_list_size", "hls_time") are located under > ofmt->priv_class->option. > // But AVClass *priv_class is not the first member of the AVOutputFormat. > // So, due to the documentation, av_opt_find...(), av_opt_get...() and > av_opt_set...() > // cannot be used for options within AVOutputFormat. > // In practice, any of the following three lines causes exception. > const AVOption *o = av_opt_find2(ofmt, "segment_list_size", NULL, > 0, AV_OPT_SEARCH_CHILDREN, &target_obj); > av_opt_get_int(ofmt, "segment_list_size", AV_OPT_SEARCH_CHILDREN, &i1); > av_opt_set_int(ofmt, "segment_list_size", 10, AV_OPT_SEARCH_CHILDREN); > > Our question: If there is a way to overcome the problem, i.e. to > set/get/find options for AVOutputFormat, like for AVCodecContext (for > example)?
Why for AVOutputFormat? Isn't what you need AVFormatContext ? > > Thank you, > Andrey Mochenov. > _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
