Copyright: Auric Visions Ltd, 2000


Rosoft MP3 Encoder

[Buttons], [Output Folder], [MP3 Options], [About MP3], [Progress]

Here is Rosoft Engineering's latest program in the Audio Tools series. This program is included in Rosoft Audio Tools 2.2.3 and forward. It is available as a stand-alone version. You can encode fast speed, normal speed, and high quality. You can set the bitrate up to 320 kbps. You can chose to use VBR or non-VBR, but note some hard ware DVD, CD, MP3 Player etc can not read VBR. For example my DVD player in my living room only reads CBR. The speed of the fast mode is fast compared to other encoders, the high quality are slower but generated a high quality sound. In later updates of the help file I will give a report for the coming blind tests I have planned within late July or early August 2001.

For support or questions about the program feel free to send an email to mp3@RosoftEngineering.com

This program supports the Lame ain't no Mp3 Encoder (LAME) project.

To be able to use the program you need to download the file lame_enc.dll your self. If you go to http://www.RosoftEngineering.com/lameenc.cgi you will be redirected to lames official homepage from where you can download the DLL. Or if you find a site where you can by lame_enc.dll or a program that includes lame_enc.dll you can of course do that.


Buttons

 Encode

Start the encoding of the first file. After the first file has been encoded it removes the wave file from the track list and goes on the the next one in the list. The encoded files ends up in the output folder.

 Stop

Stop the encoding of all files.

 Add Files

Add files to the track list.

 Edit Output Folder

Opens the form for setting the Output Folder.

 Lame Options

Opens the form for setting the options for the Lame Encoder.

 Remove

Remove the file selected from the track list.

 Remove all

Remove all tracks from the track list. Generally clear the list.

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Output Folder

This is the form for setting the destination for the encoded mp3 files. All encoded files will end up in the folder set by this form. The output folder is also shown at the bottom in the main window.

OK

Press this button for setting the new folder.

Cancel

Press this button for rejecting the folder you have chosen.

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About MP3

I guess most people have heard about mp3. For those ho haven't I will try go get a short introduction.

mp3 is a way to compress digital audio. Digital is impossible to compress if you want the uncompressed information to be unchained. There fore you must cheat a little bit when compressing digital audio. The only way is to split the audio signal into frames. For every frame you then must find the frequencies and their values. Many frequencies can be removed because you do not hear them. For example man can only hear two signals at the same time if the differences between them are less than 50 dB, that is if one signal is 90 dB every signal less than 40 dB can be removes since you never hears those signals. At lest a normal person doesn't hear them. There is only one type of songs where I have heard the difference and that is songs with slide or steal guitar. So if you are a trained musician and have good hearing and also have a really good sound board, maybe you should be able to hear the difference.

In mp3 files you simply save what frequencies, their values and how long the are.

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Progress

Over all progress

Shows the over all progress of the files that are to be encoded.

File Progress

How much percentage of the the tfile encoding that has been encoding.

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MP3 Options

In Format

This field has no effect on the recording. It is used so you can check what Out Format you can use for a specific In Format. An audio CD has "44100 Hz – Stereo – 172 kbps". If you use a CD Ripper program this field should be checked to ensure that you select a valid Out Format.

Out Format

This is the format of the encoded file. The first value is the sample rate, the second is the channel mode (stereo/mono) and the last is the bitrate. High bitrate gives high quality and large files. Low bitrate gives lower quality and smaller files.

Encoder

At the moment there is only the Fraunhofer encoder to chose from.

Quality Mode

The option sets the quality of the encoder. High Quality giver very good sound but takes more time to encode. Normal giver a fairly good sound and at fairly low speed. Fast Encoder encodes the file fast but gives a lower quality of the sound.

Padding Mode

Certain multimedia and architectures (namely, Microsoft Netshow) have a hard time dealing with blocks of variable size. If you want to transport MPEG Layer-3 content over this system, setting Padding Mode to Never or Always will make the encoder generate equally sized frames. Only ISO is guaranteed to write ISO-compliant bitstreams with exact bitrates

Private bit on

This controls the so-called value of the private bit. Nark this to indicate that this bitstream is an original. Unmark this control if it is a copy.

CRC bit on

If this control is marked the encoder generates CRC check sums.

Copyright bit on

Controls the copy bit in the MPEG frame header. Mark this control to indicate that this bitstream is an original.

Original bit on

Controls the original bit in the MPEG frame header. Mark this control to indicate that this bitstream is an original.

Allow Intensity

Usually you should allow the encoder to use intensity stereo coding, especially at the lower bitrates. However, in special cases, it might be useful to disallow intensity stereo.

Allow Midside

Usually you should allow the encoder to use mid/side stereo coding, especially at the lower bitrates. However, in special cases, it might be useful to disallow mid/side stereo. This flag is not supported yet.

Allow Downmix

Usually you should allow the encoder to downmix stereo input to mono output. However in special cases, it might be useful to disallow downmix.

VBR on

Mark this control if you want to use  Variable Bit Rate (VBR).

VBR Quality

Sets the quality of the VBR mode. 0 is the as Constant Bit Rate (CBR). Value 1 is the highest VBR quality while 10 is the lowest VBR Quality.

OK

Press this button to save the options you have entered in the Registry.

Cancel

Press cancel to close the form without saving the data in the Registry.

Help

Press help to open this help page.

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