[Libav-user] HLS options problem

[Andrey Mochenov]

Hi Paul,
Thank you, it is exactly what we need.
Andrey.

On Tue, Aug 13, 2013 at 3:40 PM, Paul B Mahol <onemda at gmail.com> wrote:

> On 8/13/13, Andrey Mochenov <andrey2067 at gmail.com> 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.
> >
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