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doc: more details in mp2 coding

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minjaesong
2023-01-25 21:00:15 +09:00
parent 1f0b8a0a8d
commit 5be05e8eec
2 changed files with 20 additions and 5 deletions
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9
terranmon.txt
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@@ -415,7 +415,7 @@ Packet Types -
32 | 0 | 1
48 | 2 | 3
56 | 4 | 5
64 | 6 | 7 (libtwolame does not allow bitrate lower than this on 32 kHz)
64 | 6 | 7 (libtwolame does not allow bitrate lower than this on 32 kHz stereo)
80 | 8 | 9
96 | 10 | 11
112 | 12 | 13
@@ -429,7 +429,12 @@ Packet Types -
Add 128 to the resulting number if the frame has a padding bit (should not happen on 32kHz sampling rate)
Special value of 255 may indicate some errors
To encode an audio to compliant format, use ffmpeg: ffmpeg -i <your_music> -acodec libtwolame -b:a <rate>k -ar 32000 <output.mp2>
To encode an audio to compliant format, use ffmpeg: ffmpeg -i <your_music> -acodec libtwolame -psymodel 4 -b:a <rate>k -ar 32000 <output.mp2>
Rationale:
-acodec libtwolame : ffmpeg has two mp2 encoders, and libtwolame produces vastly higher quality audio
-psymodel 4 : use alternative psychoacoustic model -- the default model (3) tends to insert "clunk" sounds throughout the audio
-b:a : 256k is recommended for high quality audio (trust me, you don't need 384k)
-ar 32000 : resample the audio to 32kHz, the sampling rate of the TSVM soundcard
GLOBAL TYPE 0 Packet -
uint32 SIZE OF FRAMEDATA