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GOM Encoder

How to convert high quality videos for iPod / iPod Touch.

High-quality H.264 video conversion for iPod/iPod Touch using Baseline Profile 3.0 is possible with GOM Video Converter.If you review the specs for the iPod Touch, you’ll notice the following limitations for H.264(AVC) video playback.

* H.264 video up to 720p, 30 frames per second, Main Profile level 3.1 with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats.
* MPEG-4 video, up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps per channel, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats.
* Link : http://www.apple.com/ipodtouch/specs.html

Baseline Profile level 1.3 has a low maximum bit rate, resulting in relatively poor video quality, and thus making it difficult to convert files for TV output. GOM Video Converter supports conversions using Baseline Profile 3.0, which provides higher quality output to compliment the enhanced specifications of current generation portable devices.

To use the high-quality iPod output preset, click the [Preset Settings] button on the main window, click the [+] next to "Apple", then select "iPod Touch/AVC/TVOUT" and click [Apply].

To change the output settings manually, follow the steps below.

 


1. Click the [Settings] button under "Output Info", then set the "Output Type" to "[MP4] – Format for iPod, iPhone, iPad, PSP, Cell Phone".

 

2. From ‘Codec Tab - Options’, check ‘Limit H.264 Baseline Profile@Level 1.3/3.0’ and select 3.0 from the right.

 

3. Additional changes to "Bit Rate" and "Video Quality" can be made from the "Codec" tab. When you’ve finished adjusting these settings, click on the "Video" tab to make changes to "Size", "Ratio", "Frame", etc.

4. Click the [OK] button to save the current settings and return to the main window.

* Notice *
It's possible to use either the x264 codec or the Intel H.264 codec when converting videos to H.264(AVC). We have observed instances where the Intel H.264 codec failed to properly limit the Bit Rate as per the selected Baseline Level, resulting in improper playback on some devices. For this reason, we recommend the x264 codec for most users. (You can choose which H.264 codec you want to use by clicking the [Config.] button and going to the "Codec" tab).

*  Baseline Profile Level refers to limitations set on H.264(AVC) videos to make them playable on portable devices that have restrictive technical specifications.For a detailed description on the H.264 specification and its various profiles, refer to the Wikipedia article linked below.
Link : http://en.wikipedia.org/wiki/H.264