Online Audio Extractor
AoA Audio Extractor
The videos will show up in the main window along with basic information such as the Start, End, Source Format, and Output Format. You can change the output format under the Output Options section below the main list. Select a video and click on Movie Clip if you want to extract audio from a specific time segment in the video. Before clicking Start, click on Browse and choose the location for the output MP3 file.
Now, go ahead and click Start and the extraction process will begin. The program is pretty fast, it took only 1 minute to extract audio from a 19 minute video clip.
You should now see your audio file at the location specified! I checked the sound quality between the video and the audio file and they were exactly the same, so you’re not going to lose any quality in the extraction process.
wav
file from an mp4
file with the command:wav
file? (e.g. say I want to preserve the quality of the original audio as much as I can)Extract .wav From .dat To Word
2 Answers
wav
files typically contain uncompressed audio, and that is the default when producing a wav
file using ffmpeg
. So your command will already preserve the maximum quality, since there is no lossy compression (or compression of any kind) to reduce the quality.mp4
file:flv / mp4 to wav / flac / mp3
) Using ffmpeg
version 2.3.1 in Ubuntu 14.04-i
), such as, input.mp4
or other files- flv, avi, ..
). To remove the video (-vn
) and take audio out uncompressed (output.wav
) at a sample rate of 44100 Hz (-ar 44100
) in pulse code modulated with signed, 16 bit, little endian (-acodec pcm_s16le
) samples and 2 channels (stereo) (-ac 2
) use the following command. -acodec
options are mp3 flac m4a
. -acode flac
converts to 24 bit file. For 16 bit sampling it should beac3
conversion works with -acodec 3F2R/LFE -ac 6
but creats 4 dummy tracks, as checked in Audacity. protected by Community♦Jul 1 at 13:06
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Processing/Java
Audacity Sound Editor
Data Tape Format
RCA Coin Arcade Games and FRED Tape Encoding
RCA COSMAC VIP Tape Encoding
Example Data Waveform in Audacity Sound Editor
Video Showing How To Use Audacity
Extraction Procedure
- Use Audacity Effect options to Normalize Arcade and FRED format data to remove DC offsetand set maximum amplification level -4.0 dB.
OR - If the VIP program WAV file has problems with low amplitude 2000 Hz high tones, do the following steps in Audacity.
A) After selecting the wave form, run the High pass filter at 2000 Hz with 6dB rolloff.
B) Next Normalize the selection to remove DC offset and set maximum amplitude to 0 dB.
Extract .wav From .dat To Mp4
Notes
- I noticed some tapes only have 2047 bytes stored, so the 2048th byte is sometimes interpreted as garbage (manifested as a parity error, depending on how the trailing audio is trimmed. The last byte is probably correct despite the parity error.
- Several programs may be stored sequentially in the WAV file. You have to isolate and extract each program individually.
- A program may be stored as a variable number of 256 byte pages. The size of the code is not always fixed at 2048 bytes. If you do not know the number of pages, start with a ROM size of 2048 bytes and by trial and error decrease (multiples of 256 byte pages) until you do not see errors and the size makes sense.
- Apparently some VIP tapes may have been recorded with phase reversals as pointed out in the RCA COSMAC VIP Instruction Manual documentation posted by Herb Johnson at http://www.retrotechnology.com/restore/VIP%20Tape%20Format.html To solve this issue there is a phase boolean variable that has to be changed to successfully extract a program from this kind of frequency phase shifted recording.