Okay.

In MEGUI
1. Tools > Muxer > MP4 Muxer

In MEGUI Muxer
1. For video input, click [...] and select your file, Mother converted.mp4
2. For Audio 1, click [...] and select this file, 05 - Mother Ta0 48K 16bit 2ch.mp3 (5,448,960 bytes)
3. Here's where we do the investigation. Under the Device Type dropdown, you can select from "Standard, iPhone, iPod, ISMA, and PSP". I want you to try each and every one of these options, and see if the resulting video will play on your HTC phone.
4. Click Queue.

Back in MEGUI
1. You're currently at the Input tab. Click on the "Queue" tab right next to it.
2. Click "Start". Processing should not really take more than a few seconds.

And you're done!

I followed your instruction. None of the device type worked.

I think perhaps if there is any solution to resize the video format, it might work out?

At this point, I have no idea Chingy. It seems MeGUI won't do it for you. I'd stick with that program, and the muddy sound :(

For what it's worth, here's my attempt, which I'm almost positive won't work on your phone.

I don't really understand why it's no working. Is it possible to use MeGUI to convert the original file to another format? Do you have any other programs you know besides MeGUI I can convert and leaving the audio format as it is?

Sorry dude, I got nothing.

Aaah, alright! Thanks anyway!

Wow, Videora really does sound bad. Looks (sounds) like they use an incredibly bad audio encoder. Aac at 128kbps *should* sound close to perfect!

Anyway i took the liberty to convert the video with AutoMKV (which used x264 for video and nero aac for audio, i'm not sure if it's different to meGUI in that way).

I made 2 versions, take your pick: