保固維修相關事宜(平輸MP3) - 消費者保護
By Megan
at 2010-11-04T22:58
at 2010-11-04T22:58
Table of Contents
跟店老闆之間的問題不在這邊討論
主要是講一些技術性的東西
MP3自1991年開始定義以來已經走過快20個年頭
中間多少有些改動,但大致來說相對平順
編碼器雖然目前的主流是LAME,但也不是沒有其他家Encoder
壓縮流率來說,主流有128 CBR, 128 VBR, 320 CBR
但這不代表其他的壓縮格式沒有被使用
例如ABR(平均位元率)壓縮演算法,VBR則從128~240都有人使用
還有640 CBR這種大概沒人在用(也大概沒有撥放器撥得出來)的格式
聲道數以stereo為主,但近來則有joint stereo,memo亦少量使用
取樣率幾乎都是44.1kHz 16bit或是48kHz 16bit,但並不是沒有其他的取樣率
此外,ID3v2 TAG,以及U-LE,U-BE.UTF-8 Codepage的引入也改變了檔案的標頭結構
近來還出現了APEv2
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上面只是在話歷史....我這邊要講的重點是
不是所有能在PC上撥的.mp3檔都能夠在所有的MP3撥放器上面正常撥放
你聽音樂會頓,通常代表撥放器的內部解碼器跑不來或是出現異常錯誤導致斷音
ABR壓縮的通常都不支援,大於320kbps的別想
有些撥放器跑位元率變動太大的VBR會出錯,CBR會保險些
也不要嘗試44.1/48kHz 16bit以外的的取樣率
要測試的話,自己用Lame Mp3 Encoder的Release版本壓
128kbps CBR, 44.1kHz, 16bit, Stereo, ID3v1 TAG
有問題再爭
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此外如果你是自己插SD卡撥放,還要考慮SD卡的存取速度喔...
(雖然只要有class標籤的都不至於不夠快)
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消費者保護
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