On 4/20/2022 9:31 AM, Shubham Tiwari wrote:
My use case is redaction of audio. To achieve this, our backend adds the
filter to mute the audio in the ffmpeg command and then executes on audio
files.
What are those commands? The original email only shows basic file conversion.
When we use the extension of the output
audio file as mp3, then the time taken is high. When we use the original
extension (wav) in the output audio file, then the file size is high (for
some cases, the size goes upto 250mb+).
To expand on what Ferdi said- on input the file extension is only used to
make a guess about the format; on output it's used to select that format
unless told otherwise. So if the output file is called file.wav, ffmpeg is
going to write an uncompressed wav; if it's file.mp3, ffmpeg will write an
mp3 file using default parameters. All of that can be overridden using
command line parameters.
Please read parts 1-7 of the doc at https://ffmpeg.org/ffmpeg-all.html to
see how the parameters & options behave.
Do you know the reason why reducing the quality even further takes
longer?
That's decoding the compressed data into raw/uncompressed date, the
re-compressing/encoding; more steps, more work.
Also, please read https://ffmpeg.org/mailing-list-faq.html
Later,
z!
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