[FFmpeg-devel] how to download specific track data of a m3u8 content?

[Steven Liu]

2016-06-28 14:26 GMT+08:00 aihua zhao <aihua.halley.zhao at gmail.com>:

> Hi Experts:
>
> I use ffmpeg to parse/demux media content, and created a player basing on
> it.
>
> here is a m3u8 content:
>
> http://asp.cntv.lxdns.com/asp/hls/main/0303000a/3/default/438eb7a818b246c187e72f1cd4e1bc4c/main.m3u8
> <
> http://asp.cntv.lxdns.com/asp/hls/main/0303000a/3/default/438eb7a818b246c187e72f1cd4e1bc4c/main.m3u8?maxbr=1200
> >
> there are three video track in it.
>
> I found all video/audio tracks are downloaded during playback, and I can
> switch different track on the fly.
> however, it consumes much bandwidth since all tracks are downloaded.
>
> even when I append bandwidth to the url; still the same result:
>
> http://asp.cntv.lxdns.com/asp/hls/main/0303000a/3/default/438eb7a818b246c187e72f1cd4e1bc4c/main.m3u8?maxbr=1200
>
> Is there any way to download the specified track only to save bandwidth?
>
> thanks
>

Hi Aihua Zhao,

      If you haven't read the m3u8 file and parse the playlist, and read
the sub m3u8 playlist, how do you get the info of the mpegts?

      So it's must readahead the list and list all of the track for choose.