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Thread: iPhone and desktop using Microsoft Expression Encoder 4 Pro

  1. #1

    Default iPhone and desktop using Microsoft Expression Encoder 4 Pro

    I am trying to convert a video to a multi-bitrate video that is suitable for iPhone and desktop using Microsoft Expression Encoder 4 Pro. I see on http://www.wowza.com/forums/content....ideo-on-Demand there is two separate preset for iPhone and desktop. Can one present be created out of those two…? I am converting a lot of video and I think one preset will make it go faster.

    Also I see you are using VBR Pass 2 in the preset..Is that necessary?

  2. #2

    Default

    The main thing is that some devices cannot play Main Profile media. If you want to make a more universal encoding, stick with the iphone profile and add higher bitrate/resolution streams.

  3. #3

    Default

    Thanks for the info…Beseline profile with high bitrate will be as good as main profile with medium/low bitrate?

    What do I loose when doing "iphone profile and add higher bitrate/resolution streams" compare to "two separate preset for iPhone and desktop"

  4. #4

    Default

    Main and High profiles have support for more advanced algorithms, which means better compression, but also more CPU utilization when decoding/playing. The main difference being that baseline profile doesn't have B-Frames.

    So, Main and High will look better than Baseline at the same bit-rate and resolution.

    It is a waste to send a high-resolution 1080p stream to a phone which only has 480p. If you are going to have different multi-bitrate .smil files for different devices, you might as well create different encodings. This is especially important for large sites/events where the cost of bandwidth is high.

  5. #5

    Default

    Thanks for the info..

    lets say I create two encoding profile (iphone and desktop)

    Can I combine it as one smil file to serve? even though there is main and baseline mixed

  6. #6
    Join Date
    Dec 2007
    Posts
    21,962

    Default

    You can, but only for iOS:

    http://www.wowza.com/forums/content....to-iOS-Streams

    Richard

  7. #7

    Default

    did I create a correct smil for ios? The first 3 was created with iphone preset from Microsoft Expression Encoder 4 Pro and the rest is created with desktop preset from Microsoft Expression Encoder 4 Pro

    <smil>
    	<head>
    	</head>
    	<body>
    		<switch>
    			<video src="mp4:myStream1" system-bitrate="170000" width="212" height="120">
    				<param name="audioCodecId" value="mp4a.40.2" valuetype="data"/>
    				<param name="videoCodecId" value="avc1.66.30" valuetype="data"/>
    				<param name="audioOnly" value="TRUE" valuetype="data"/>
    			</video>
    			<video src="mp4:myStream1" system-bitrate="270000" width="320" height="180">
    				<param name="audioCodecId" value="mp4a.40.2" valuetype="data"/>
    				<param name="videoCodecId" value="avc1.66.30" valuetype="data"/>
    			</video>
    			<video src="mp4:myStream1" system-bitrate="470000" width="640" height="360">
    				<param name="audioCodecId" value="mp4a.40.2" valuetype="data"/>
    				<param name="videoCodecId" value="avc1.66.30" valuetype="data"/>
    			</video>
    			<video src="mp4:myStream1" system-bitrate="350000" width="320" height="180">
    				<param name="audioCodecId" value="mp4a.40.2" valuetype="data"/>
    				<param name="videoCodecId" value="avc1.77.30" valuetype="data"/>
    			</video>
    			<video src="mp4:myStream1" system-bitrate="650000" width="476" height="268">
    				<param name="audioCodecId" value="mp4a.40.2" valuetype="data"/>
    				<param name="videoCodecId" value="avc1.77.30" valuetype="data"/>
    			</video>
    			<video src="mp4:myStream1" system-bitrate="1000000" width="640" height="360">
    				<param name="audioCodecId" value="mp4a.40.2" valuetype="data"/>
    				<param name="videoCodecId" value="avc1.77.30" valuetype="data"/>
    			</video>
    			<video src="mp4:myStream1" system-bitrate="1400000" width="1080" height="608">
    				<param name="audioCodecId" value="mp4a.40.2" valuetype="data"/>
    				<param name="videoCodecId" value="avc1.77.30" valuetype="data"/>
    			</video>
    			<video src="mp4:myStream1" system-bitrate="2500000" width="1280" height="720">
    				<param name="audioCodecId" value="mp4a.40.2" valuetype="data"/>
    				<param name="videoCodecId" value="avc1.77.30" valuetype="data"/>
    			</video>
    		</switch>
    	</body>
    </smil>

  8. #8

    Default

    Any update?

  9. #9
    Join Date
    Dec 2007
    Posts
    21,962

    Default

    It looks okay. You have to test it.

    Richard

  10. #10

    Default

    Correct me if I am wrong


    Take a look at http://ewelby.com/mediainfo.png

    According to http://www.wowza.com/forums/content....to-iOS-Streams


    it will be


    <param name="audioCodecId" value="mp4a.40.2" for audio?
    <param name="videoCodecId" value="avc1.66.12" valuetype="data"/> for video?


    Also what is the 40 in audio?
    Last edited by welbyobeng; 07-04-2012 at 07:14 PM.

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