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POiPhone HE-AAC Streaming over Mobile Network (3G)
 

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    <p>Developed an internet radio streamer using jPlayer which utilizes the html5 audio tags with jQuery and has a flash fall back for unsupported browsers. Upon testing the player on the iPhone (iOS 5.0.1), we ran into a very peculiar issue.</p> <p>When the iPhone is connected to WiFi, it streams perfectly using the HE-AAC V2 stream @ 64kbps 44.1kHz (the preferred codec for apple products). However, when the iPhone is connected to the 3G mobile network, it "stutters" or stops streaming for 1-2 secs every 1-2 minutes (does not stop streaming completely). The troubling thing is when the iPhone is forced to use a separate MP3 stream at the same bit rate, it does not have this issue and works very well on 3G.</p> <p><strong>UPDATE 5</strong></p> <p>We recently acquired a 3G/4G Sprint mobile hotspot device and tested this issue with the device. When the iPhone is connected to the mobile hotspot, it shows as being connected to a wifi device and the issue does not render even tho the actual connection is via 3G/4G. This might point back to the issue being with the iPhone not handling HE-AAC via HTTP Live Streaming and when directly connected to the mobile network. </p> <p><strong>UPDATE 4</strong></p> <p>Updated the iPhone to iOS 5.1 yet the issue persists.</p> <p><strong>UPDATE 3</strong></p> <p>Read here on SO various issues of script not rendering correctly when connected to mobile networks. The finger seems to point to the mobile network carriers that may be inserting Proxy to serve webpages, e.g. for downsizing images. Also it might inject some JavaScript pages. The test page can be found <a href="http://remixradio.fm/index2.html" rel="noreferrer">HERE</a> Note: this page is using HE-AAC so it will only work on iPhone...</p> <p><strong>UPDATE</strong></p> <p>According to Apple's HTTP Live Streaming doc for iOS devices, that "Audio-only content can be either MPEG-2 transport or MPEG elementary audio streams, either in AAC format with ADTS headers or in MP3 format." Our music server is using OddcastV3 encoder to send out three streams (MP3, HE-AAC V2, and Oggvorbis) to the icecastV2 server. Not sure if the encoder is inserting ADTS headers for the HE-AAC V2 stream. Is there a way to check for this?</p>
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    1. COthat's your business, but my advice for you is to get more reputation on SO and become able to start a bounty for the first question. you can earn reputation answering any topics, not just ios-related.
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    2. CORead from Apple's HTTP Live Streaming doc for iOS devices, that "Audio-only content can be either MPEG-2 transport or MPEG elementary audio streams, either in AAC format with ADTS headers or in MP3 format." Not sure if the stream has ADTS headers. Not sure if this is the issue...
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    3. COHere http://developer.apple.com/resources/http-streaming/ on the right side you can find a tool for a stream check. After installation you use it like this: mediastreamvalidator validate --timeout=60 http://ssite.com/track.mp3 You will see the most important issues in the log.
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