Can someone suggest me a better way to convert files for Walkman NWZ-E453?

[walkingman00]

Hello everyone!
So I've got an mp3 player, Sony Walkman NWZ-E453, and I'd like to put some videos on it, so I could watch them when I'm driving with bus.
First off I googled and found a very easy and fast way to convert my files. And I did it by using ffmpeg and libfaac. And then all I had to do was use this command:
"ffmpeg -i input.mp4 -b 567k -s 320x240 -vcodec mpeg4 -ab 220k -ar 44100 -ac 2 -acodec libfaac output.mp4"

But it turns out that the sound level is so low. I mean even at the maximum volume it is really hard to listen to the sound. Ok, when I'd be at home, it wouldn't be such a big thing, but when I'm travelling with a bus, then the bus' noise really annoys me.

So is there anything I could do with this particular command, or is there any other way I could convert the file so my mp3 player would accept it? I tried other programs as well, but I'm not sure if it was my fault and I choosed the wrong settings, or the program was bad. And then Sony Walkman also has a software, which is meant for converting, but for some reason, my file didn't work.

And so you might ask, which sort of videos I would like to convert. Well, an example, a YouTube file:
Video #0 : AVC at 3 378 Kbps
Aspect : 1920 x 1080 (1.778) at 25.000 fps

Audio #0 : AAC at 152 Kbps
Infos : 2 channels, 44.1 KHz

So yeah, to conclude, the only bad thing about with this command above, is that the sound quality is not what I would like it to be. But the video quality is great =)

Thanks (and sorry for my English, hehe ),
walkingman00

[bat999]

Well, an example, a YouTube file:
Video #0 : AVC at 3 378 Kbps
Aspect : 1920 x 1080 (1.778) at 25.000 fps

Audio #0 : AAC at 152 Kbps
Infos : 2 channels, 44.1 KHz

Hi
Your example video already has aac audio, so there's no need to mess with it.
You can keep the original sound track, just 'copy' it.
And only convert the video track.
Change your FFmpeg command like this:-

ffmpeg -i input.mp4 -vcodec mpeg4 -b 567k -s 320x240 -acodec copy output.mp4

[walkingman00]

Well, it still didn't give me the result I wanted.. But still thanks for trying. I'll keep digging in Google, to see if I can find a way so that the sound quality would be the one that satisfies me.
But yeah, it seems strange that even if I copy the audio track from the source and won't re-encode it, it's still with so low volume on my mp3 player. Hmm.. not sure, maybe it's the headphones. I think I should test the sound volume with other headphones.