I'm not certain if this is useful to you but Bob McCune on Twitter mentioned a new tech note about new avfoundation apis which specifically mentions reference movies.
https://developer.apple.com/library/mac/technotes/tn2404/_index.html#//apple_ref/doc/uid/DTS40015060 I'd also recommend his book learning avfoundation. Kevin Sent from my iPad > On 15 Dec 2014, at 02:57, Graham Cox <graham....@bigpond.com> wrote: > > Just an update on this, since I've made some useful progress, but I'm a bit > stuck again. > > > I am able to download the video streams and write them to a .ts file which > plays fine in apps such as VLC (Quicktime Player not so much). So far this is > all done with NSURLSession, breaking apart the m3u8 file(s) and loading each > media chunk, reassembling them into the correct order and writing them to the > file. > > What I'd like to do now is to have a live preview of what data is being > received (so far I just accumulate it to the file with no preview). AVPlayer > can do this all by itself, but I assume that it's going to be duplicating the > download, thus doubling the bandwidth I need. What I'd rather do is feed my > already downloaded chunks of data to an AVPlayer somehow. This is where the > AV Foundation programming guide and the framework itself is a bit daunting - > I don't really know which objects I need to be looking at. I'm thinking > AVCaptureInput... or is it AVCaptureInputPort, or maybe AVAssetReader. > Unfortunately this sort of low level extension of AV Foundation isn't well > covered in the programming guide. > > Some useful pointers to the rough shape of what I need to do would get my > project moving again. > > --Graham > > > > > > >> On 9 Dec 2014, at 10:37 am, Graham Cox <graham....@bigpond.com> wrote: >> >> OK, thanks. I was hoping that I didn't need to delve into the internals of >> the m3u8 format itself, since AVPlayer/AVPlayerView handles it just fine - I >> just make a NSURL from the m3u8 url and away it goes. >> >> By the way, it isn't just audio, it's video and audio and possibly other >> things - there are three tracks in the asset for the stream I tested with >> but I forget what the third is now (first two were video and audio). >> >> It seems as if the architecture of AV Foundation allows what I want, but the >> actual implementation doesn't, *unless I've missed something*. I'm wondering >> if this gap in the implementation is deliberate for some reason, is there >> but requires some other combinaiton of parameters from the nes I've tried, >> on Apple's 'to do' list or is fundamentally not possible. >> >> >> --Graham >> >> >> >> >>> On 9 Dec 2014, at 4:50 am, dangerwillrobinsondan...@gmail.com wrote: >>> >>> >>> >>> >>> Sent from my iPhone >>>> On 2014/12/09, at 1:38, Jens Alfke <j...@mooseyard.com> wrote: >>>> >>>> m3u8 isn't a stream, it's simply a small playlist file that contains one >>>> or more HTTP URLs, which resolve to audio files, usually MP3. In the case >>>> of streaming, the HTTP audio resource uses the Shoutcast format, which is >>>> basically just an audio stream that looks like an infinitely long MP3 file. >>>> >>>> So all you need to do is read the URL from the .m3u8 file (which is pretty >>>> trivial; IIRC it's just a text file containing a URL) and use something >>>> like NSURLConnection to read data from it and write it to a file with a >>>> ".mp3" extension. Since it's a stream you'll never hit EOF so you'll want >>>> to stop the connection after a while. >>>> >>>> If you need to write the audio into some other kind of movie file you >>>> should be able to feed the data received from the URL into AVFoundation. >>>> You'll just need to inform it that the data format is MP3. >>> It is not limited to MP3 >>> Http Live Streaming uses this playlist format. >>> Literally just a list of URLs really. Where each one is a short clip of >>> media content. >>> The content on the other end is usually small files as parts of the whole. >>> The u on the end means UTF8. >>> The video format could vary. >> >> >> _______________________________________________ >> >> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) >> >> Please do not post admin requests or moderator comments to the list. >> Contact the moderators at cocoa-dev-admins(at)lists.apple.com >> >> Help/Unsubscribe/Update your Subscription: >> https://lists.apple.com/mailman/options/cocoa-dev/graham.cox%40bigpond.com >> >> This email sent to graham....@bigpond.com > > > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/cocoa-dev/ktam%40yvs.eu.com > > This email sent to k...@yvs.eu.com _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. 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