Why do I do this. I should leave this alone but...

BassThumper's original question related to changing a YouTube video file to an MP3 audio file.

Mike's response was to say one can't convert video to audio.

But that was not what Bass Thumper had said.

Below is an image of before and after media-info reports for a YouTube mp4 file changed to a mp3 audio file by the simply doing:
$ ffmpeg -i SavedYachts\ 140MB\ Medium.mp4 SavedYachts\ audio.mp3

You will see that it has indeed 'extracted' the audio, but it has then converted from the mp4's AAC LC to an mp3 audio stream, probably in a different coding and certainly at a different data rate, before repackaging in mp3 file format.

One could equally argue that the conversion 'extracted' the video and dumped it.

In either case the new mp3 file is of a different type to the mp4, with different packaging data, so the file has been converted.

'Extraction' may well be part of the process, but the whole process from start to end is a conversion.

A final binary compare shows the two files differ right from the very first byte, despite these both being mpeg files. The file types and the file header information are different.


Attached Files (Click to download or enlarge) (Only available when you are logged in)
mp4-mp3.jpeg (154.56 KB, 72 downloads)
mp3 to mp3
Last edited by Gordon Scott; 09/15/23 08:12 AM. Reason: type date->data
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