Produce ap cbr 224 same quality like aps -B 224? Thank you. MC

I'm not quite sure what you're asking but I'll try and help.

--alt-preset cbr 224 produces a Constant Bit Rate mp3 using 224kbps naturally

--alt-preset 224 produces an mp3 of Average Bit Rate using frames above and below 224kbps. These frames are compressed the same as those using constant bit rate but their size are allowed to vary. Forcing the upper bitrate to go no higher than 224 but allowing it to go below will only deteriorate the quality and is pointless using.

So, --alt-preset cbr 224 would be better than your other suggestion.

Thank you very much, the question was put because my mp3cd walkman cant go up 224, but cbr 224 produce too much long file. I understand that -B 224 is not equal aps standart. But i dont understand :
"Using -B is NOT RECOMMENDED. A 128 kbps CBR bitstream, because of the
bit reservoir, can actually have frames which use as many bits as a
320 kbps frame. ABR/VBR modes minimize the use of the bit reservoir, and
thus need to allow 320 kbps frames to get the same flexability as CBR
streams. "

I wouldn't say the --alt-preset standard -B 224 vs. --alt-preset CBR 224 question is that easy to answer.

Have a look a it that way: --alt-preset standard uses codelevel tweaks that makes it perform good on samples that can't sound good with any commandline created of switches. If you lower the maximum bitrate with -B you'll run into problems sooner or later (depending e.g. on type of music - an old near-to-mono, 10kHz frequency cutoff recording will hardly use any 256kbps+ frames with aps).

IMO you can't say what's better in general. It depends on the music encoded, your hearing (and how much it is trained to notice artifacts) and what problems you "prefer" over others (if you notice a difference).

Another point: If your mp3-CD player is one of those with crappy decoders, it could be that it has other problems too, like distortion/aliassing on high frequencies like 16kHz+ (I have one like this.) - you might want to test this first. So maybe you're forced to use a lower lowpass like --lowpass 16 which will save bits.

IMO you'll have to find out what sounds best to you yourself (if there's a difference at all) and I suggest you to try --alt-preset standard -B 224 -lowpass xxx additionally (or even the same with medium if you use lame 3.93.1).