怪怪,LAME mp3
				
發表於 : 
週五 8月 06, 2004 10:43 am由 Alecto
				最近用EAC將家裡的cd轉到電腦裡
外掛壓縮程式是LAME mp3
我是選320k高音質
不過很奇怪的是壓出來的檔案顯示bit rate都是四、五百k
但檔案大小卻只有128k左右的大小
難道LAME的壓縮比比較高嗎?
因為我再用iTunes的320k vbr壓的結果
檔案大了一倍有餘
這倒底那個壓出來的音質比較好?
只就mp3而言
			 
			
				
				
發表於 : 
週五 8月 06, 2004 10:03 pm由 oScARSr
				你lame用的是哪一版呢?
bitrate值大約是多少呢?(也許你開到VBR)
以下是我的設定檔和bitrate值。
(如果AAC也是CBR的話,檔案大小應該會和MP3是差不多大的才會啊)
 

 
			
				
				
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週五 8月 06, 2004 11:45 pm由 weiliya
				
			 
			
				
				
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週五 8月 06, 2004 11:50 pm由 oScARSr
				vbr就是variable bitrate rate 的縮寫,
能算是有智慧的壓縮方法,
會依照歌曲需求而自動做流量的調整。
所以當歌曲需求沒有那麼高的話,
vbr壓出來的檔案會小一點。
cbr相對的就是固定流量的壓縮法。
當軟體不完整支援vbr時,顯示出來的bitrate值就會很大。
你先試試看CBR輸出還會不會有問題。
我第二圖是foobar的properties。
======================================
以下的你看看,3.96版的設定。(我從CMD裡自己抓來看的)
The --preset switches are designed to provide the highest possible quality.
They have for the most part been subject to and tuned via rigorous double blind
listening tests to verify and achieve this objective.
These are continually updated to coincide with the latest developments that
occur and as a result should provide you with nearly the best quality
currently possible from LAME.
To activate these presets:
   For VBR modes (generally highest quality):
     "--preset medium" This preset should provide near transparency
                             to most people on most music.
     "--preset standard" This preset should generally be transparent
                             to most people on most music and is already
                             quite high in quality.
     "--preset extreme" If you have extremely good hearing and similar
                             equipment, this preset will generally provide
                             slightly higher quality than the "standard"
                             mode.
   For CBR 320kbps (highest quality possible from the --preset switches):
     "--preset insane"  This preset will usually be overkill for most
                             people and most situations, but if you must
                             have the absolute highest quality with no
                             regard to filesize, this is the way to go.
   For ABR modes (high quality per given bitrate but not as high as VBR):
     "--preset <kbps>"  Using this preset will usually give you good
                             quality at a specified bitrate. Depending on the
                             bitrate entered, this preset will determine the
                             optimal settings for that particular situation.
                             While this approach works, it is not nearly as
                             flexible as VBR, and usually will not attain the
                             same level of quality as VBR at higher bitrates.
The following options are also available for the corresponding profiles:
   <fast>        standard
   <fast>        extreme
                 insane
   <cbr> (ABR Mode) - The ABR Mode is implied. To use it,
                      simply specify a bitrate. For example:
                      "--preset 185" activates this
                      preset and uses 185 as an average kbps.
   "fast" - Enables the new fast VBR for a particular profile. The
            disadvantage to the speed switch is that often times the
            bitrate will be slightly higher than with the normal mode
            and quality may be slightly lower also.
   "cbr"  - If you use the ABR mode (read above) with a significant
            bitrate such as 80, 96, 112, 128, 160, 192, 224, 256, 320,
            you can use the "cbr" option to force CBR mode encoding
            instead of the standard abr mode. ABR does provide higher
            quality but CBR may be useful in situations such as when
            streaming an mp3 over the internet may be important.
    For example:
    "--preset fast standard <input file> <output file>"
 or "--preset cbr 192 <input file> <output file>"
 or "--preset 172 <input file> <output file>"
 or "--preset extreme <input file> <output file>"
A few aliases are available for ABR mode:
phone => 16kbps/mono        phon+/lw/mw-eu/sw => 24kbps/mono
mw-us => 40kbps/mono        voice => 56kbps/mono
fm/radio/tape => 112kbps    hifi => 160kbps
cd => 192kbps               studio => 256kbps
			 
			
				
				
發表於 : 
週六 8月 07, 2004 12:16 am由 bonjacky
				用那一套程式播放??
印象中 Windows Media Player 碰到 vbr,顯示就會錯亂
			 
			
				
				
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週六 8月 07, 2004 12:54 am由 oScARSr
				Alecto 寫:bonjacky 寫:用那一套程式播放??
印象中 Windows Media Player 碰到 vbr,顯示就會錯亂
還沒有播,只是看檔案內容而已
 
如果是"在explore"下看檔案內容的話,
你看到的就是WMP預覽給你看的格式 - 錯誤資訊。 

 
			
				
				
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週六 8月 07, 2004 1:03 am由 Kotosuke
				weiliya 寫:基本上使用320k已經不會有VBR因為320K已經只可能是cbr了
還是可以壓VBR 320k的啊,不是嗎?變動率256~320…
話說LAME 320K CBR VS. MPC 320K
呵呵,MPC比較優
weiliya 寫:建議換成最新的3.96或是3.90.3
3.93 -> Do not use!
WHY?3.93有嚴重BUG嗎??
我已經很久沒製造MP3了 

 
			
				
				
發表於 : 
週六 8月 07, 2004 2:57 am由 weiliya
				Kotosuke 寫:weiliya 寫:基本上使用320k已經不會有VBR因為320K已經只可能是cbr了
還是可以壓VBR 320k的啊,不是嗎?變動率256~320…
話說LAME 320K CBR VS. MPC 320K
呵呵,MPC比較優
weiliya 寫:建議換成最新的3.96或是3.90.3
3.93 -> Do not use!
WHY?3.93有嚴重BUG嗎??
我已經很久沒製造MP3了 

 
3.93 -> Do not use!是hydrogenaudio上說的,印象中3.93好像有Bug
256~320K平均起來不太可能是320K,所以說無論是abr,vbr是320K的說法都很奇怪
mpc以前我都用-q6(200左右),我是很久沒壓mp3了,
GT3b2版Ogg Vorbis Encoder壓制出來的ogg也不錯且支援的播放器也比較多
 
			
				
				
發表於 : 
週六 8月 07, 2004 3:00 am由 Alecto
				oScARSr 寫:Kotosuke 寫:話說LAME 320K CBR VS. MPC 320K
呵呵,MPC比較優
真的啊,
MPC有聽過不錯的評論。
等一下來試試看好了。
 
怪,為何wav檔在轉完後不會消掉?
我很確定我有勾消除wav檔
而且mp3的檔名怪怪的,都是xxtmp
我的參數是設
--alt-preset insane --ta "%a" --tt "%t" --tl "%g" --ty "%y" --tn "%n" %s
為什麼奧大的只要設 preset insane?
 
			
				
				
發表於 : 
週六 8月 07, 2004 3:22 am由 oScARSr
				Alecto 寫:怪,為何wav檔在轉完後不會消掉?
我很確定我有勾消除wav檔
而且mp3的檔名怪怪的,都是xxtmp
我的參數是設
--alt-preset insane --ta "%a" --tt "%t" --tl "%g" --ty "%y" --tn "%n" %s
為什麼奧大的只要設 preset insane?
你重裝一次EAC好了...
因為新版的lame的參數有改。
還有就是我上面用的不是User Defined Encoder
而是直接用LAME MP3 Encoder
所以不用用到--ta "%a" --tt "%t" --tl "%g" --ty "%y" --tn "%n" %s
這串定義ID3的參數。