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Requirements
 1. An application that should run, to begin with, on iPhone, and, in the end on a plurality
    of SmartPhone devices.
2. Aim at having the trans-coding code supporting as much OSs as possible.
3. Application is commercial.

Use-case
 I.  Record video using the portable SmartPhone Camera application
II. Trans-code the video into a plurality of bit-rates using a cutom app

iPhone Implementation
 A. To satisfy requirement [2], Implement Trans-coding using C++
B. Use ffmpeg for trans-coding.

Problem
- Using ffmpeg to encode H264 req usage of the x264 lib
- H264 encoding mandate payment for Licensing.

In order to avoid H264 Licensing
- The iPhone device ( and many others ) come with built-in H264 encoding capability
- Usage of the built-in H264 Codec will avoid licensing problems/restrictions

Does ffmpeg, supports, in any way, usage of iPhone's built-in H264 encoder ?



Any help will be appreciated.

NadavRub
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  • 'Aim at having the trans-coding code supporting as much OSs as possible.' sounds like a dream – Uğur Gümüşhan Feb 14 '13 at 12:35
  • Why does it? assuming the only part changing is the H264 encoder and the rest eg. MP4 demuxing is done using ffmpeg. – NadavRub Feb 14 '13 at 12:42
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    @NadaRub you can't target ios and platform independence at the same time. forget about it. – Uğur Gümüşhan Feb 14 '13 at 12:44
  • independence == only for the trans-coding module, thus, a .SO or .a, the rest, obviously is quite platform dependent – NadavRub Feb 14 '13 at 12:45
  • Both the hardware and license issues covered here: http://stackoverflow.com/questions/17606933/using-ffmpeg-to-display-video-on-iphone/17622379#17622379 – MoDJ Jul 12 '13 at 19:23

2 Answers2

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I would recommend Encoding.com's HLS offering.

http://www.encoding.com/help/article/easily_create_iphone_streaming_files_with_encodingcom

user17050
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  • I don't need HLS, rather, I merely need to be able to transcode an existing file into multiple different bit-rates, it appears that I have no choice BUT to use the ALAssetWriter/Reader Obj-C objects having this iPhone specific – NadavRub Feb 19 '13 at 07:59
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The AVFoundation framework provides a mechanism to write H264 encoded video to a file (mp4 or quicktime container format). You can attempt to parse the video file and extract the H264 NALs as they're being written.

It's a little bit tricky, but it should be doable.

bsirang
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