Bedienung von CDex

    hallo,
    kann mir mal jemand erklären, was ich in dem genannten Programm mit diesen gekennzeichneten Einstellungen eigentlich bewirke? Wie wirken diese sich auf das Endprodukt mp3-Datei aus und merke ich beim Hören irgendwelche Unterschiede. Vielleicht gehts mit ein paar einfachen Worten, denn ein Herumprobieren ist für mich zu zeitaufwändig und die Resultate sind doch nur per Hörprobe zu beurteilen. Eventuell steckt ja mehr dahinter.
    mfG.
    [/url]

    jetzt hab ich den Link gefunden (war nicht als Link markiert)


    nun zur Antwort:
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    Quality (default value Normal):


    With the LAME encoder, you can specify the output quality; thus you can trade off encoding time against sound quality. The default (normal) is recommended for the lower bitrates (<160 kbps), high quality for bitrates >160 kbps. The voice quality is more or less optimized to generate the best quality for voice. Details of the R3Mix quality option can be found at http://www.r3mix.net.


    MPEG-I/II setting (default value MPEG-I):


    The difference between MPEG-I and MPEG-II are the sample frequencies of the input file. MPEG-I can handle input streams (WAV files) with a sample frequency of 48000, 44100 and 32000 Hz. MPEG-II on the other hand will support stream for 24000, 22050 160000 Hz. Basically, use MPEG-II when you want to encode with low bit rates (e.g. for voice files, or if you need small MP3 files with reduced quality). As you can see, the lowest bit-rate for MPEG-II is 8 Kbits/sec while for MPEG-I the lowest bit rate is 32 Kbits/s.


    VBR Method Setting


    The VBR method setting allows you the change the VBR algorithm which is used for the encoding (detailed information can be found in the LAME user documentation - see http://www.sulaco.org/mp3/doc/html/index.html). The following selections are available


    Disabled: Don't use VBR; instead encodie with a Constant Bit Rate (CBR)
    VBR-Default: Use the default VBR method (currently set to VBR-MTRH)
    VBR-Old: LAME's first functional approach, based on masking, bisection in the bit domain.
    VBR-New: LAME's second approach, based on masking and direct noise allocation.
    VBR-MTRH: a combination of old and new (VBR) routines
    VBR-ABR: The Average Bit Rate (ABR) setting, the encoding principle is similar to what AAC uses as VBR encoding, it is based on perceptual entropy, but more like CBR than VBR. When you select the ABR option in the VBR Settings box, the ABR edit box will be enabled. In this edit box you can specify the target average bit rate. Of course, a larger bit rate will yield generally better-sounding (but larger) MP3 files.


    ABR Settings


    VBR Quality Setting
    This option allows you to set the Variable bit-rate option. Variable bit-rate encoding will enable dynamically determined bit-rates that depend on the music content of the current frame. This improves the overall quality of the encoded file without increasing the file size. This option sets the criteria used to determine when to increase the bit-rate for a frame. The lower the number, the lower the criteria will be. Thus VBR_0 will yield the best quality (but the largest file size) while VBR_9 will have less sound quality but the file size will be the smallest. The recommended variable bit-rate option is VBR_4. If you don't want VBR encoding, set this option to None.




    Private
    When enabled, it will set the private flag in the MP3 stream.


    Original
    When enabled, it will set the original flag in the MP3 stream.


    Copyright
    When enabled, it will set the copyright flag in the MP3 stream.


    Checksum
    When enabled, it will add a cyclic redundancy check (CRC) code in each frame, allowing [the decoding software] to detect transmission errors that could occur on the MP3 stream. However, it takes 16 bits per frame that would otherwise be used for encoding, and therefore will slightly (probably imperceptibly) reduce the sound quality.