Different source material and / or application is likely to produce somewhat different results.Īssuming the target is a portable device with average in-ear headphones, my approach to the job would be something like this: These values are valid for this specific piece of audio using this specific version of Ocenaudio. These results give an indication of what can be expected, but these aren't set to stone. These have a significant drop in the audio quality, but only with the smallest file bad enough to really bother me. All of these files have - to my ear - perfectly fine quality when the point is just to keep the speech clear and understandable.įor the two smallest files I first converted the original 44.1K mono file to 8K, then exported it as 8 kbps MP3, FBR and VBR. Ocenaudio's 32bit export is slightly smaller, and dropping the bitrate to 16bit halves the size.Īll the MP3 files are exported from the 16bit mono file. It can also export with other encodings but I didn't test due crash. The original audio is a 44.1KHz 16bit stereo WAV file.īoth Audacity and Ocenaudio work internally with 32bit floating point data, and Audacity's default export is with that encoding hence the large file size. The resulting file sizes: 001-orig_stereo.wav 4355464 Variable Bitrate with qualities Highest, Medium and Lowest (7 in total available).I then exported the mono file from Ocenaudio with different settings: I opened the file in both Audacity and Ocenaudio, split it to mono files and saved one of the mono files to new wavs. I actually tried to work this out with Audacity, but it crashed on me, so I reverted back to Ocenaudio, which has been my weapon of choice for this kind of work for almost 2 decades. I did a bit of testing on this, using this snippet by maestro Brian Eno from SampleSwap. This should only be selected for streaming over the Internet since it helps to prevent stutters and skips.There are many roads to Rome, none of which can be considered "right" or "best". It keeps the bit rate the same, no matter if no audio is playing or if 70 voices are talking in unison. Constant bit rate mode offers the worst audio encoding.The program still provides a slightly larger bit rate for more complex sections of audio while maintaining an overall average of the bit rate you selected. Average bit rate mode provides an average bit rate based on your selection.Variable bit rate mode automatically attempts to provide the lowest bit rate possible while losing only non-essential audio data.Choose a low bit rate to lower the bit rate of the audio. Preset bit rate mode provides four bit rates that are selected for you.Just select the file type you want from the "Format" menu and select "Options" to change the bit rate. If you want to change the bit rate using another compressed file type, such as OGG or an M4A file, the steps are similar.You can also select "Download" directly from the "Libraries" menu to download the needed codecs. Locate the file using the file browser and then select it. Save that file on your main hard drive and then click on the "Libraries" option in the Audacity "Preference" menu. To do this, download the codec from the link provided in the error code. If you get an error code, you may need to visit the Audacity website to download a codec for certain types of audio.
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