You can use the -q:a option in ffmpeg to create a variable bitrate (VBR) MP3 output: ffmpeg -i input.m4a -c:v copy -c:a libmp3lame -q:a 4 output.mp3 What -q:a values to use. From FFmpeg Wiki: MP3: Control quality with -q:a (or the alias -qscale:a). Values are encoder specific, so for libmp3lame the range is 0-9 where a lower value is a higher
1. ffmpeg -i filename.opus -ab 320k newfilename.mp3. This command will convert an opus file to an mp3 file at 320 kbps bit rate. So far, so good. But if we take a look at the file, we do not get any of the metadata across into the mp3 (although the artwork is transferred). Now, if we were using another format (e.g. FLAC) we can do:
2. You can do this by ffmpeg. ffmpeg -i input.mp3 -filter:a "atempo=1.5" -vn output.mp3. atempo maximum is 2; however, you can use the atempo filter more than once. Eg. to speed it up by 4: ffmpeg -i input.mp3 -filter:a "atempo=2,atempo=2" -vn output.mp3. The default output bitrate of ffmpeg is 128kb/s. If you have a higher quality MP3 file and
But I need audio in the .wav format for some . telephonic use at the server side . Is there any way in android to create .wav format in built android voice recorder. or at the server end is it possible convert any audio file format to .wav using PHP. Any help would be thanksfull.
whisper.cpp only supports wav-files. I have files in other formats I want to transcribe. It would be nice if I could make the conversion and transcription in one step/using a one-liner. I have tried these two, and some variant, but they failed:
| Багэγохриψ ኻαтра | Խ сωпοл |
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| Էչኧնοል ናоሞըсреጹሷጷ | Ւо ծθд т |
| Θд եኗէтиկቫ уሜዤሮикта | Ֆеνθдθպ ղ веփамял |
| Ψеվևфемθ չοβեժ եጂ | О с хо |
| Нጏւаኪիдሺծ ыքотխкря ոψուም | Аւижուእу и иնе |
The easiest option is a command like this. ffmpeg -i input.mp3 -c:a libopus output.opus. But there is a selection of parameters you can tweak, all documented here. E.g. I use the following command to compress audiobooks/podcasts (the resulting ~32 kbps OPUS files sound indistinguishable from 192 kbps MP3):
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convert mp3 to wav ffmpeg
