After several attempts, I was finally able to successfully convert using VisualHub for Mac a video file for viewing on a Sony Ericsson phone.
Here’s the config:
(Convert) To: MP4
320 Pixel Wide : Checked
Quality: Standard
RTSP Streaming: Do not check
H.264 Streaming: Do not check
In the Advanced settings, check Force and select QuickTime Decoding. Ignore all the other settings.
Thanks to this article for giving me some ideas on the correct settings.

Ederic Eder
Ederic is a Filipino communications worker in the telecom, media, and technology industry. He writes about K-dramas and Korean celebrities for Hallyudorama.
He used to be a social media manager for news at GMA Network, where he also headed YouScoop, GMA News and Public Affairs’ citizen journalism arm.
He was with Yahoo! Philippines for more than three years before returning to GMA Network, where he was also previously part of the News Research section.
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