I installed iTunes again and made a couple of tests. I am positive that
iTunes v7.7.0.43 is unable to play MP4/MOV/etc AAC files, encoded by
ffmpeg (using ffmpeg.exe -i file.wav -acodec libfaac -ar xxx -ab yyy
-cutoff zzz -f fmt file.mp4 or similar commandline; ffmpeg of version
git-c83671b at 11 June 2008), unless it's LC-AAC.
As for bitrate, i encoded 2400 audio files in a few days, and here's the
results for 480 of them (others are the same, just in different format,
i.e. ipod, 3gp, mov, etc - it seems that iTunes accepts any mov-based
format as long as it is LC-AAC, and foobar2000 accepts almost anything,
except maybe mov):
001 rock.short.wav_-ab_92000_-ar_22050_aac_low_-cutoff_0_-f_mp4
76 kbps
002 rock.short.wav_-ab_92000_-ar_22050_aac_low_-cutoff_220_-f_mp4
8 kbps
003 rock.short.wav_-ab_92000_-ar_22050_aac_low_-cutoff_551_-f_mp4
14 kbps
004 rock.short.wav_-ab_92000_-ar_22050_aac_low_-cutoff_1102_-f_mp4
24 kbps
005 rock.short.wav_-ab_92000_-ar_22050_aac_low_-cutoff_2450_-f_mp4
47 kbps
006 rock.short.wav_-ab_92000_-ar_22050_aac_low_-cutoff_3150_-f_mp4
58 kbps
007 rock.short.wav_-ab_92000_-ar_22050_aac_low_-cutoff_4410_-f_mp4
75 kbps
008 rock.short.wav_-ab_92000_-ar_22050_aac_low_-cutoff_11025_-f_mp4
92 kbps
009 rock.short.wav_-ab_92000_-ar_22050_aac_ltp_-cutoff_0_-f_mp4
76 kbps
010 rock.short.wav_-ab_92000_-ar_22050_aac_ltp_-cutoff_220_-f_mp4
8 kbps
011 rock.short.wav_-ab_92000_-ar_22050_aac_ltp_-cutoff_551_-f_mp4
14 kbps
012 rock.short.wav_-ab_92000_-ar_22050_aac_ltp_-cutoff_1102_-f_mp4
25 kbps
013 rock.short.wav_-ab_92000_-ar_22050_aac_ltp_-cutoff_2450_-f_mp4
47 kbps
014 rock.short.wav_-ab_92000_-ar_22050_aac_ltp_-cutoff_3150_-f_mp4
58 kbps
015 rock.short.wav_-ab_92000_-ar_22050_aac_ltp_-cutoff_4410_-f_mp4
76 kbps
016 rock.short.wav_-ab_92000_-ar_22050_aac_ltp_-cutoff_11025_-f_mp4
92 kbps
017 rock.short.wav_-ab_92000_-ar_22050_aac_main_-cutoff_0_-f_mp4
76 kbps
018 rock.short.wav_-ab_92000_-ar_22050_aac_main_-cutoff_220_-f_mp4
8 kbps
019 rock.short.wav_-ab_92000_-ar_22050_aac_main_-cutoff_551_-f_mp4
14 kbps
020 rock.short.wav_-ab_92000_-ar_22050_aac_main_-cutoff_1102_-f_mp4
24 kbps
021 rock.short.wav_-ab_92000_-ar_22050_aac_main_-cutoff_2450_-f_mp4
47 kbps
022 rock.short.wav_-ab_92000_-ar_22050_aac_main_-cutoff_3150_-f_mp4
58 kbps
023 rock.short.wav_-ab_92000_-ar_22050_aac_main_-cutoff_4410_-f_mp4
75 kbps
024
rock.short.wav_-ab_92000_-ar_22050_aac_main_-cutoff_11025_-f_mp4
92 kbps
025 rock.short.wav_-ab_92000_-ar_44100_aac_low_-cutoff_0_-f_mp4
92 kbps
026 rock.short.wav_-ab_92000_-ar_44100_aac_low_-cutoff_441_-f_mp4
15 kbps
027 rock.short.wav_-ab_92000_-ar_44100_aac_low_-cutoff_1102_-f_mp4
29 kbps
028 rock.short.wav_-ab_92000_-ar_44100_aac_low_-cutoff_2205_-f_mp4
48 kbps
029 rock.short.wav_-ab_92000_-ar_44100_aac_low_-cutoff_4900_-f_mp4
91 kbps
030 rock.short.wav_-ab_92000_-ar_44100_aac_low_-cutoff_6300_-f_mp4
92 kbps
031 rock.short.wav_-ab_92000_-ar_44100_aac_low_-cutoff_8820_-f_mp4
92 kbps
032 rock.short.wav_-ab_92000_-ar_44100_aac_low_-cutoff_22050_-f_mp4
126 kbps
033 rock.short.wav_-ab_92000_-ar_44100_aac_ltp_-cutoff_0_-f_mp4
92 kbps
034 rock.short.wav_-ab_92000_-ar_44100_aac_ltp_-cutoff_441_-f_mp4
15 kbps
035 rock.short.wav_-ab_92000_-ar_44100_aac_ltp_-cutoff_1102_-f_mp4
29 kbps
036 rock.short.wav_-ab_92000_-ar_44100_aac_ltp_-cutoff_2205_-f_mp4
48 kbps
037 rock.short.wav_-ab_92000_-ar_44100_aac_ltp_-cutoff_4900_-f_mp4
91 kbps
038 rock.short.wav_-ab_92000_-ar_44100_aac_ltp_-cutoff_6300_-f_mp4
92 kbps
039 rock.short.wav_-ab_92000_-ar_44100_aac_ltp_-cutoff_8820_-f_mp4
92 kbps
040 rock.short.wav_-ab_92000_-ar_44100_aac_ltp_-cutoff_22050_-f_mp4
126 kbps
041 rock.short.wav_-ab_92000_-ar_44100_aac_main_-cutoff_0_-f_mp4
92 kbps
042 rock.short.wav_-ab_92000_-ar_44100_aac_main_-cutoff_441_-f_mp4
15 kbps
043 rock.short.wav_-ab_92000_-ar_44100_aac_main_-cutoff_1102_-f_mp4
29 kbps
044 rock.short.wav_-ab_92000_-ar_44100_aac_main_-cutoff_2205_-f_mp4
48 kbps
045 rock.short.wav_-ab_92000_-ar_44100_aac_main_-cutoff_4900_-f_mp4
91 kbps
046 rock.short.wav_-ab_92000_-ar_44100_aac_main_-cutoff_6300_-f_mp4
92 kbps
047 rock.short.wav_-ab_92000_-ar_44100_aac_main_-cutoff_8820_-f_mp4
92 kbps
048
rock.short.wav_-ab_92000_-ar_44100_aac_main_-cutoff_22050_-f_mp4
126 kbps
049 rock.short.wav_-ab_92000_-ar_48000_aac_low_-cutoff_0_-f_mp4
92 kbps
050 rock.short.wav_-ab_92000_-ar_48000_aac_low_-cutoff_480_-f_mp4
17 kbps
051 rock.short.wav_-ab_92000_-ar_48000_aac_low_-cutoff_1200_-f_mp4
31 kbps
052 rock.short.wav_-ab_92000_-ar_48000_aac_low_-cutoff_2400_-f_mp4
52 kbps
053 rock.short.wav_-ab_92000_-ar_48000_aac_low_-cutoff_5333_-f_mp4
92 kbps
054 rock.short.wav_-ab_92000_-ar_48000_aac_low_-cutoff_6857_-f_mp4
92 kbps
055 rock.short.wav_-ab_92000_-ar_48000_aac_low_-cutoff_9600_-f_mp4
92 kbps
056 rock.short.wav_-ab_92000_-ar_48000_aac_low_-cutoff_24000_-f_mp4
133 kbps
057 rock.short.wav_-ab_92000_-ar_48000_aac_ltp_-cutoff_0_-f_mp4
92 kbps
058 rock.short.wav_-ab_92000_-ar_48000_aac_ltp_-cutoff_480_-f_mp4
17 kbps
059 rock.short.wav_-ab_92000_-ar_48000_aac_ltp_-cutoff_1200_-f_mp4
31 kbps
060 rock.short.wav_-ab_92000_-ar_48000_aac_ltp_-cutoff_2400_-f_mp4
52 kbps
061 rock.short.wav_-ab_92000_-ar_48000_aac_ltp_-cutoff_5333_-f_mp4
92 kbps
062 rock.short.wav_-ab_92000_-ar_48000_aac_ltp_-cutoff_6857_-f_mp4
92 kbps
063 rock.short.wav_-ab_92000_-ar_48000_aac_ltp_-cutoff_9600_-f_mp4
92 kbps
064 rock.short.wav_-ab_92000_-ar_48000_aac_ltp_-cutoff_24000_-f_mp4
134 kbps
065 rock.short.wav_-ab_92000_-ar_48000_aac_main_-cutoff_0_-f_mp4
92 kbps
066 rock.short.wav_-ab_92000_-ar_48000_aac_main_-cutoff_480_-f_mp4
17 kbps
067 rock.short.wav_-ab_92000_-ar_48000_aac_main_-cutoff_1200_-f_mp4
31 kbps
068 rock.short.wav_-ab_92000_-ar_48000_aac_main_-cutoff_2400_-f_mp4
52 kbps
069 rock.short.wav_-ab_92000_-ar_48000_aac_main_-cutoff_5333_-f_mp4
92 kbps
070 rock.short.wav_-ab_92000_-ar_48000_aac_main_-cutoff_6857_-f_mp4
92 kbps
071 rock.short.wav_-ab_92000_-ar_48000_aac_main_-cutoff_9600_-f_mp4
92 kbps
072
rock.short.wav_-ab_92000_-ar_48000_aac_main_-cutoff_24000_-f_mp4
133 kbps
073 rock.short.wav_-ab_92000_-ar_88200_aac_low_-cutoff_0_-f_mp4
118 kbps
074 rock.short.wav_-ab_92000_-ar_88200_aac_low_-cutoff_882_-f_mp4
30 kbps
075 rock.short.wav_-ab_92000_-ar_88200_aac_low_-cutoff_2205_-f_mp4
57 kbps
076 rock.short.wav_-ab_92000_-ar_88200_aac_low_-cutoff_4410_-f_mp4
92 kbps
077 rock.short.wav_-ab_92000_-ar_88200_aac_low_-cutoff_9800_-f_mp4
93 kbps
078 rock.short.wav_-ab_92000_-ar_88200_aac_low_-cutoff_12600_-f_mp4
107 kbps
079 rock.short.wav_-ab_92000_-ar_88200_aac_low_-cutoff_17640_-f_mp4
134 kbps
080 rock.short.wav_-ab_92000_-ar_88200_aac_low_-cutoff_44100_-f_mp4
203 kbps
081 rock.short.wav_-ab_92000_-ar_88200_aac_ltp_-cutoff_0_-f_mp4
118 kbps
082 rock.short.wav_-ab_92000_-ar_88200_aac_ltp_-cutoff_882_-f_mp4
30 kbps
083 rock.short.wav_-ab_92000_-ar_88200_aac_ltp_-cutoff_2205_-f_mp4
57 kbps
084 rock.short.wav_-ab_92000_-ar_88200_aac_ltp_-cutoff_4410_-f_mp4
92 kbps
085 rock.short.wav_-ab_92000_-ar_88200_aac_ltp_-cutoff_9800_-f_mp4
93 kbps
086 rock.short.wav_-ab_92000_-ar_88200_aac_ltp_-cutoff_12600_-f_mp4
107 kbps
087 rock.short.wav_-ab_92000_-ar_88200_aac_ltp_-cutoff_17640_-f_mp4
134 kbps
088 rock.short.wav_-ab_92000_-ar_88200_aac_ltp_-cutoff_44100_-f_mp4
204 kbps
089 rock.short.wav_-ab_92000_-ar_88200_aac_main_-cutoff_0_-f_mp4
118 kbps
090 rock.short.wav_-ab_92000_-ar_88200_aac_main_-cutoff_882_-f_mp4
30 kbps
091 rock.short.wav_-ab_92000_-ar_88200_aac_main_-cutoff_2205_-f_mp4
57 kbps
092 rock.short.wav_-ab_92000_-ar_88200_aac_main_-cutoff_4410_-f_mp4
92 kbps
093 rock.short.wav_-ab_92000_-ar_88200_aac_main_-cutoff_9800_-f_mp4
93 kbps
094
rock.short.wav_-ab_92000_-ar_88200_aac_main_-cutoff_12600_-f_mp4
108 kbps
095
rock.short.wav_-ab_92000_-ar_88200_aac_main_-cutoff_17640_-f_mp4
134 kbps
096
rock.short.wav_-ab_92000_-ar_88200_aac_main_-cutoff_44100_-f_mp4
204 kbps
097 rock.short.wav_-ab_92000_-ar_96000_aac_low_-cutoff_0_-f_mp4
128 kbps
098 rock.short.wav_-ab_92000_-ar_96000_aac_low_-cutoff_960_-f_mp4
33 kbps
099 rock.short.wav_-ab_92000_-ar_96000_aac_low_-cutoff_2400_-f_mp4
62 kbps
100 rock.short.wav_-ab_92000_-ar_96000_aac_low_-cutoff_4800_-f_mp4
92 kbps
101 rock.short.wav_-ab_92000_-ar_96000_aac_low_-cutoff_10666_-f_mp4
99 kbps
102 rock.short.wav_-ab_92000_-ar_96000_aac_low_-cutoff_13714_-f_mp4
115 kbps
103 rock.short.wav_-ab_92000_-ar_96000_aac_low_-cutoff_19200_-f_mp4
143 kbps
104 rock.short.wav_-ab_92000_-ar_96000_aac_low_-cutoff_48000_-f_mp4
220 kbps
105 rock.short.wav_-ab_92000_-ar_96000_aac_ltp_-cutoff_0_-f_mp4
128 kbps
106 rock.short.wav_-ab_92000_-ar_96000_aac_ltp_-cutoff_960_-f_mp4
33 kbps
107 rock.short.wav_-ab_92000_-ar_96000_aac_ltp_-cutoff_2400_-f_mp4
62 kbps
108 rock.short.wav_-ab_92000_-ar_96000_aac_ltp_-cutoff_4800_-f_mp4
92 kbps
109 rock.short.wav_-ab_92000_-ar_96000_aac_ltp_-cutoff_10666_-f_mp4
99 kbps
110 rock.short.wav_-ab_92000_-ar_96000_aac_ltp_-cutoff_13714_-f_mp4
115 kbps
111 rock.short.wav_-ab_92000_-ar_96000_aac_ltp_-cutoff_19200_-f_mp4
143 kbps
112 rock.short.wav_-ab_92000_-ar_96000_aac_ltp_-cutoff_48000_-f_mp4
220 kbps
113 rock.short.wav_-ab_92000_-ar_96000_aac_main_-cutoff_0_-f_mp4
128 kbps
114 rock.short.wav_-ab_92000_-ar_96000_aac_main_-cutoff_960_-f_mp4
33 kbps
115 rock.short.wav_-ab_92000_-ar_96000_aac_main_-cutoff_2400_-f_mp4
62 kbps
116 rock.short.wav_-ab_92000_-ar_96000_aac_main_-cutoff_4800_-f_mp4
92 kbps
117
rock.short.wav_-ab_92000_-ar_96000_aac_main_-cutoff_10666_-f_mp4
99 kbps
118
rock.short.wav_-ab_92000_-ar_96000_aac_main_-cutoff_13714_-f_mp4
116 kbps
119
rock.short.wav_-ab_92000_-ar_96000_aac_main_-cutoff_19200_-f_mp4
143 kbps
120
rock.short.wav_-ab_92000_-ar_96000_aac_main_-cutoff_48000_-f_mp4
220 kbps
121 rock.short.wav_-ab_128000_-ar_22050_aac_low_-cutoff_0_-f_mp4
76 kbps
122 rock.short.wav_-ab_128000_-ar_22050_aac_low_-cutoff_220_-f_mp4
8 kbps
123 rock.short.wav_-ab_128000_-ar_22050_aac_low_-cutoff_551_-f_mp4
14 kbps
124 rock.short.wav_-ab_128000_-ar_22050_aac_low_-cutoff_1102_-f_mp4
24 kbps
125 rock.short.wav_-ab_128000_-ar_22050_aac_low_-cutoff_2450_-f_mp4
47 kbps
126 rock.short.wav_-ab_128000_-ar_22050_aac_low_-cutoff_3150_-f_mp4
58 kbps
127 rock.short.wav_-ab_128000_-ar_22050_aac_low_-cutoff_4410_-f_mp4
75 kbps
128
rock.short.wav_-ab_128000_-ar_22050_aac_low_-cutoff_11025_-f_mp4
128 kbps
129 rock.short.wav_-ab_128000_-ar_22050_aac_ltp_-cutoff_0_-f_mp4
76 kbps
130 rock.short.wav_-ab_128000_-ar_22050_aac_ltp_-cutoff_220_-f_mp4
8 kbps
131 rock.short.wav_-ab_128000_-ar_22050_aac_ltp_-cutoff_551_-f_mp4
14 kbps
132 rock.short.wav_-ab_128000_-ar_22050_aac_ltp_-cutoff_1102_-f_mp4
25 kbps
133 rock.short.wav_-ab_128000_-ar_22050_aac_ltp_-cutoff_2450_-f_mp4
47 kbps
134 rock.short.wav_-ab_128000_-ar_22050_aac_ltp_-cutoff_3150_-f_mp4
58 kbps
135 rock.short.wav_-ab_128000_-ar_22050_aac_ltp_-cutoff_4410_-f_mp4
76 kbps
136
rock.short.wav_-ab_128000_-ar_22050_aac_ltp_-cutoff_11025_-f_mp4
128 kbps
137 rock.short.wav_-ab_128000_-ar_22050_aac_main_-cutoff_0_-f_mp4
76 kbps
138 rock.short.wav_-ab_128000_-ar_22050_aac_main_-cutoff_220_-f_mp4
8 kbps
139 rock.short.wav_-ab_128000_-ar_22050_aac_main_-cutoff_551_-f_mp4
14 kbps
140
rock.short.wav_-ab_128000_-ar_22050_aac_main_-cutoff_1102_-f_mp4
24 kbps
141
rock.short.wav_-ab_128000_-ar_22050_aac_main_-cutoff_2450_-f_mp4
47 kbps
142
rock.short.wav_-ab_128000_-ar_22050_aac_main_-cutoff_3150_-f_mp4
58 kbps
143
rock.short.wav_-ab_128000_-ar_22050_aac_main_-cutoff_4410_-f_mp4
75 kbps
144
rock.short.wav_-ab_128000_-ar_22050_aac_main_-cutoff_11025_-f_mp4
128 kbps
145 rock.short.wav_-ab_128000_-ar_44100_aac_low_-cutoff_0_-f_mp4
128 kbps
146 rock.short.wav_-ab_128000_-ar_44100_aac_low_-cutoff_441_-f_mp4
15 kbps
147 rock.short.wav_-ab_128000_-ar_44100_aac_low_-cutoff_1102_-f_mp4
29 kbps
148 rock.short.wav_-ab_128000_-ar_44100_aac_low_-cutoff_2205_-f_mp4
48 kbps
149 rock.short.wav_-ab_128000_-ar_44100_aac_low_-cutoff_4900_-f_mp4
91 kbps
150 rock.short.wav_-ab_128000_-ar_44100_aac_low_-cutoff_6300_-f_mp4
110 kbps
151 rock.short.wav_-ab_128000_-ar_44100_aac_low_-cutoff_8820_-f_mp4
128 kbps
152
rock.short.wav_-ab_128000_-ar_44100_aac_low_-cutoff_22050_-f_mp4
130 kbps
153 rock.short.wav_-ab_128000_-ar_44100_aac_ltp_-cutoff_0_-f_mp4
128 kbps
154 rock.short.wav_-ab_128000_-ar_44100_aac_ltp_-cutoff_441_-f_mp4
15 kbps
155 rock.short.wav_-ab_128000_-ar_44100_aac_ltp_-cutoff_1102_-f_mp4
29 kbps
156 rock.short.wav_-ab_128000_-ar_44100_aac_ltp_-cutoff_2205_-f_mp4
48 kbps
157 rock.short.wav_-ab_128000_-ar_44100_aac_ltp_-cutoff_4900_-f_mp4
91 kbps
158 rock.short.wav_-ab_128000_-ar_44100_aac_ltp_-cutoff_6300_-f_mp4
111 kbps
159 rock.short.wav_-ab_128000_-ar_44100_aac_ltp_-cutoff_8820_-f_mp4
128 kbps
160
rock.short.wav_-ab_128000_-ar_44100_aac_ltp_-cutoff_22050_-f_mp4
130 kbps
161 rock.short.wav_-ab_128000_-ar_44100_aac_main_-cutoff_0_-f_mp4
128 kbps
162 rock.short.wav_-ab_128000_-ar_44100_aac_main_-cutoff_441_-f_mp4
15 kbps
163
rock.short.wav_-ab_128000_-ar_44100_aac_main_-cutoff_1102_-f_mp4
29 kbps
164
rock.short.wav_-ab_128000_-ar_44100_aac_main_-cutoff_2205_-f_mp4
48 kbps
165
rock.short.wav_-ab_128000_-ar_44100_aac_main_-cutoff_4900_-f_mp4
91 kbps
166
rock.short.wav_-ab_128000_-ar_44100_aac_main_-cutoff_6300_-f_mp4
110 kbps
167
rock.short.wav_-ab_128000_-ar_44100_aac_main_-cutoff_8820_-f_mp4
128 kbps
168
rock.short.wav_-ab_128000_-ar_44100_aac_main_-cutoff_22050_-f_mp4
130 kbps
169 rock.short.wav_-ab_128000_-ar_48000_aac_low_-cutoff_0_-f_mp4
128 kbps
170 rock.short.wav_-ab_128000_-ar_48000_aac_low_-cutoff_480_-f_mp4
17 kbps
171 rock.short.wav_-ab_128000_-ar_48000_aac_low_-cutoff_1200_-f_mp4
31 kbps
172 rock.short.wav_-ab_128000_-ar_48000_aac_low_-cutoff_2400_-f_mp4
52 kbps
173 rock.short.wav_-ab_128000_-ar_48000_aac_low_-cutoff_5333_-f_mp4
98 kbps
174 rock.short.wav_-ab_128000_-ar_48000_aac_low_-cutoff_6857_-f_mp4
118 kbps
175 rock.short.wav_-ab_128000_-ar_48000_aac_low_-cutoff_9600_-f_mp4
128 kbps
176
rock.short.wav_-ab_128000_-ar_48000_aac_low_-cutoff_24000_-f_mp4
133 kbps
177 rock.short.wav_-ab_128000_-ar_48000_aac_ltp_-cutoff_0_-f_mp4
128 kbps
178 rock.short.wav_-ab_128000_-ar_48000_aac_ltp_-cutoff_480_-f_mp4
17 kbps
179 rock.short.wav_-ab_128000_-ar_48000_aac_ltp_-cutoff_1200_-f_mp4
31 kbps
180 rock.short.wav_-ab_128000_-ar_48000_aac_ltp_-cutoff_2400_-f_mp4
52 kbps
181 rock.short.wav_-ab_128000_-ar_48000_aac_ltp_-cutoff_5333_-f_mp4
99 kbps
182 rock.short.wav_-ab_128000_-ar_48000_aac_ltp_-cutoff_6857_-f_mp4
119 kbps
183 rock.short.wav_-ab_128000_-ar_48000_aac_ltp_-cutoff_9600_-f_mp4
128 kbps
184
rock.short.wav_-ab_128000_-ar_48000_aac_ltp_-cutoff_24000_-f_mp4
134 kbps
185 rock.short.wav_-ab_128000_-ar_48000_aac_main_-cutoff_0_-f_mp4
128 kbps
186 rock.short.wav_-ab_128000_-ar_48000_aac_main_-cutoff_480_-f_mp4
17 kbps
187
rock.short.wav_-ab_128000_-ar_48000_aac_main_-cutoff_1200_-f_mp4
31 kbps
188
rock.short.wav_-ab_128000_-ar_48000_aac_main_-cutoff_2400_-f_mp4
52 kbps
189
rock.short.wav_-ab_128000_-ar_48000_aac_main_-cutoff_5333_-f_mp4
98 kbps
190
rock.short.wav_-ab_128000_-ar_48000_aac_main_-cutoff_6857_-f_mp4
119 kbps
191
rock.short.wav_-ab_128000_-ar_48000_aac_main_-cutoff_9600_-f_mp4
128 kbps
192
rock.short.wav_-ab_128000_-ar_48000_aac_main_-cutoff_24000_-f_mp4
134 kbps
193 rock.short.wav_-ab_128000_-ar_88200_aac_low_-cutoff_0_-f_mp4
128 kbps
194 rock.short.wav_-ab_128000_-ar_88200_aac_low_-cutoff_882_-f_mp4
30 kbps
195 rock.short.wav_-ab_128000_-ar_88200_aac_low_-cutoff_2205_-f_mp4
57 kbps
196 rock.short.wav_-ab_128000_-ar_88200_aac_low_-cutoff_4410_-f_mp4
97 kbps
197 rock.short.wav_-ab_128000_-ar_88200_aac_low_-cutoff_9800_-f_mp4
128 kbps
198
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Remember, that this was done using ffmpeg, and it's -ab setting sets up
the bitrate for the whole file (unlike Audacity, which sets up the
bitrate per channel). Obviously, both -ab, -ar and -cutoff have
influence on the outcome: wider bandwidth -> more opportunities to
achieve higher bitrate (and using too wide bandwidth results in
overshot, as codec has to use more bitrate that it was allowed by user).
Bandwidth == Cutoff frequency. Which, in turn, can't be more than one
half of Sample Rate.
I tweaked the calculating process by dividing selected sample rate by
two for the purpose of calculating maximum bitrate (that gives us max
129 kbit/s per channel for 44100 - more than enough, if you ask me), and
resulting file will have almost precisely the desired bitrate -
deviations will only occur for lowest bitrates (in case of 44100 Hz and
my sample audio file it was around 48 kbit/s per channel). I tested it
without a tweak - maximum per-channel bitrate in this case is 135
kbit/s, so 129 kbit/s seems a pretty good guess. For 22050Hz it is 151
kbit/s real maximum (which is ~76 kbit/s per channel) vs calculated (in
tweaked version) 64 kbit/s per channel - again, pretty close guess. So,
unless people start exporting audio in weird sample rates this tweaked
verison calculates correct maximum bitrate per channel.
SampleRate/2 cutoff frequency is still used, of course. By the way it's
funny to try to encode audio with LOW cutoff - like 1000Hz. It results
in extremely muffled sound - it cuts off all the high frequencies,
leaving only low ones. As if i'm listening through a thick wall or
messed with equalizer bass preset too much...
Unplayability of mp4 files were caused by my "black magic" patch, i
apologise. I removed it, since it was half-correct anyways (regardless
of any mistakes i made in comparison functions) - valid extensions are:
mp4, mov, 3gp and m4a. For ipod, psp, etc the mp4 extension is used.
Because of that i'm reverting back to simple "mp4" and "rename if you
need mov/3gp/etc". I think "default extension" facility is due, but that
is the story for another day (and i don't see how it could be useful for
non-aac files).