On 12-06-2024 20:15, Vlad Negru via ffmpeg-user wrote:
Hello!
I have a question,
I'm trying something pretty simple, I have a WebM file/container downloaded
from YouTube containing only 16-Bit Opus audio. I want to copy and retain just
the audio part since this container only has audio anyways, no video.
The WebM file/container is called Input.webm and is located in the
YouTube_Samples folder on my desktop.
As shown in the attached picture, it is originally in a 16-Bit format which one
would assume is using integer representation.
For copying I'm just using these very simple commands:
cd C:\Users\VLAD NEGRU\Desktop\YouTube_Samples
ffmpeg -i Input.webm -c:a copy Output.opus
However, the output file is now in a floating point format and my portable
player won't play that.
Just in case that it matters somehow for anything, I'm using Windows 10 Pro as
operating system on my computer.
Is it possible to change the default fltp (floating point) format when working
with .webm and .opus files?
Is it possible to have it set so that it retains the original 16-Bit integer
format when just copying the audio from the container?
If possible, then what is the command line argument for forcing the use of
integers with .webm and .opus files?
You need to have a version of the opus encoder that is specifically
compiled to use fixed point, the following is a quote from the opus git:
"This implementation uses floating-point by default but can be compiled
to
use only fixed-point arithmetic by setting --enable-fixed-point (if
using
autoconf) or by defining the FIXED_POINT macro (if building manually).
The fixed point implementation has somewhat lower audio quality and is
slower on platforms with fast FPUs, it is normally only used in embedded
environments."
So it is either fixed point, or floating point, but not both.
Most likely if you want fixed point you will have to compile opus yourself
using the quoted settings.
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