[FFmpeg-devel] Input metadata not updated inside mux context

[Steven Liu]

2017-01-03 5:06 GMT+08:00 Christo Grozev <cgrozev at gmail.com>:

>
> >You can use hls_ts_options to set the mpegts metadata.
> I am sorry, but won't this simply copy the metadata to the resulting mgets
> segments - but if the stream metadata is not updated following the initial
> copy, wouldn't that be the same (initial) metadata, and not the updated one
> as it comes in on the input stream?
>
I just found the describe of metadata for hls in IETF *3.5.  WebVTT*

So i think you can save it into two place:
1. mpegts
2. webvtt
Is that right?

>
> Thanks!
>
> Christo
>
>
> -----Original Message-----
> From: ffmpeg-devel [mailto:ffmpeg-devel-bounces at ffmpeg.org] On Behalf Of
> Steven Liu
> Sent: Monday, January 2, 2017 12:04 PM
> To: FFmpeg development discussions and patches <ffmpeg-devel at ffmpeg.org>
> Subject: Re: [FFmpeg-devel] Input metadata not updated inside mux context
>
> 2017-01-02 17:10 GMT+08:00 Christo Grozev <cgrozev at gmail.com>:
>
> >
> > Happy New Year to all!
> >
> > I am trying to create a patch for metadata-aware hls splitting.
> > Unfortunately, i cannot seem to get updated metadata from the
> > AVFormatContext object inside the muxer scope. For example, within
> > hlsenc.c I have this::
> >
> >     static int hls_start(AVFormatContext *s)
> >     {
> >     HLSContext *c = s->priv_data;
> >     AVFormatContext *oc = c->avf;
> >     AVFormatContext *vtt_oc = c->vtt_avf;
> >     AVDictionary *options = NULL;
> >     char *filename, iv_string[KEYSIZE*2 + 1];
> >     int err = 0;
> >     int ret = 0;
> >     AVDictionaryEntry *tag = NULL;
> >
> >     av_log(s, AV_LOG_DEBUG, "Lets check if there's metadata now.. ");
> >
> >     tag = av_dict_get(oc->metadata, "StreamTitle", tag,
> > AV_DICT_IGNORE_SUFFIX);
> >     printf("%s\n",tag->value);
> >
> >
> >
> > However, what is logged is always the original StreamTitle that was
> > valid when the initial connection to the input url was made, and is
> > not updating it further. Granted, this is the output stream context,
> > but it does contain the initial metadata, apparently. What would be
> > the way to update it, or to access the input context's metadata? Or is
> > the only solution to re-poll the input stream in a separate process?
> >
>
> You can use hls_ts_options to set the mpegts metadata.
>
> >
> >
> >
> > Thanks in advance
> >
> > Christo
> >
> >
> >
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> >
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