[FFmpeg-user] Reduce ffmpeg response

Jeff England ezmail15 at gmail.com
Thu Nov 12 02:14:59 EET 2020

Thank you very much for your assistance.  Thank you also for letting me
know I was off topic.
We ended up figuring it out, went into the library code and added a line
dealing with stdout (I don't recall the syntax).

Thanks again

On Sun, Nov 8, 2020 at 1:40 PM Jim DeLaHunt <list+ffmpeg-user at jdlh.com>

> On 2020-11-08 08:42, Jeff England wrote:
> > …Developing code in a Linux / Python environment, using Pydub and ffmpeg
> to
> > play .mp3 sound.
> > I would like to "quiet" the response from ffmpeg.  I've found a number of
> > posts along the lines of
> > ffmpeg -hide_banner -loglevel panic.  I'm having difficulty knowing
> exactly
> > where to place
> > the ffmpeg -hide_banner -loglevel panic (or the like) command.  I've
> tried
> > it following the
> > import AudioSegment
> > from pydub.playback statement and in the programming where the sound is
> > actually called.
> >
> > Any thoughts or guidance is appreciated.
> Hello, Jeff, and welcome to the FFmpeg users list. You ask an
> interesting question.
> It sounds like you are using the Python module Pydub[1] to do audio
> editing. Pydub offers an API of audio editing actions, it uses Python
> code for the logic to convert those editing actions into calls to FFmpeg
> or libav, and it can call FFmpeg behind the scenes to actually
> manipulate the audio data. It sounds like the FFmpeg invocations
> generate more text on its stdout than you want, and you want to reduce
> the amount of text which FFmpeg puts to its stdout.
> I don't know Pydub, but I do know Python and FFmepg, and I have written
> Python code which calls FFmpeg behind the scenes to actually manipulate
> the video data.
> An important thing to bear in mind is that Pydub exists in a Python
> environment, and FFmpeg exists outside that environment. You need to be
> clear what is happening in which environment.
> In reading the Pydub API docs[2], I see no way to manipulate FFmpeg
> directly. The AudioSegment(…).export() call[3] does have a `parameters`
> keyword argument, which is a list of options for Pydub to include in the
> FFmpeg invocation. The docs says, "These are added to the end of the
> call (in the output file section)." It doesn't say there is a way to put
> those parameters somewhere else. I don't see any other places in the API
> which lets the caller send parameters to the FFmpeg invocation. And of
> course, the Pydub API docs might not be complete.
> So, the first question is, which Pydub API call are you using?
> Second, in what way do you see the FFmpeg output to its stdout? Does
> Pydub return this to you?  I don't see a mention of this in the API
> docs. You should describe how you are calling Pydub, and what results
> you see, and what results you would like to see.
> Third, be aware that Pydub might not give you the control you are after.
> Fourth, be aware that Pydub is a bit off-topic for this list. Anything
> about Pydub and the way it creates an invocation of FFmpeg are
> off-topic. Questions you can phrase in terms of a command-line
> invocation of FFmpeg are where you start to be on-topic for this list.
> Nevertheless, you might still get a bit of help with the Pydub and
> Python parts of your situation.
> [1] http://pydub.com/
> [2] https://github.com/jiaaro/pydub/blob/master/API.markdown
> [3]
> https://github.com/jiaaro/pydub/blob/master/API.markdown#audiosegmentexport
> Hope this helps,
>       —Jim DeLaHunt, software engineer, Vancouver, Canada
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