[FFmpeg-user] silenceremove use

[Paul B Mahol]

On 2/20/20, To ny <tonynederpel at hotmail.com> wrote:
> The sample is the best example since the thumps are quite soft and just a
> little louder than the noise.

Use peak level detector instead of rms one.
Also reduce window size too.

> If all the three thumps and the voice would be left in the output, that
> would be great.
>
> I'll run your command and see what comes out.
>
> Ideally, it would be, if the thumps and voice would have some space between
> them during playback (of the output file), like three seconds apart and
> little bit of silence at the beginning. At the end silence isn't necessary.
>
> Ffplay i don't have compiled but using the silenceremove arguments with
> ffmpeg removes everything up until right before the two thumps with
> threshold set at -38dB. The first thump is removed unfortunately. The
> silence between the two thumps and my voice unfortunately isn't removed.
>
> At -37dB only my voice is left and none of the thumps are unfortunately left
> in.
>
> Just for clarification... In the whole recording is no absolute silence.
> Throughout the recording is noise of around -46dB. This is what i call
> "silence".
>
>
> ________________________________
> Van: ffmpeg-user <ffmpeg-user-bounces at ffmpeg.org> namens Ted Park
> <kumowoon1025 at gmail.com>
> Verzonden: donderdag 20 februari 2020 08:44
> Aan: FFmpeg user questions <ffmpeg-user at ffmpeg.org>
> Onderwerp: Re: [FFmpeg-user] silenceremove use
>
> The attachment in your first reply went through fine, I can see it. But it
> is too simple, I mean I can remove silence in it pretty well with
> % ffplay Downloads/sample.wav -af
> "silenceremove=start_periods=1:start_threshold=-30dB"
> But I assume you’re having more trouble with the original file because
> there’s occasional noise in the “silence” you want to remove, and the
> silence isn’t just at the beginning. Something more representative of the
> file you’re working with would be more helpful.
>
>> The first command i copied directly from a forum post.
>> The recording on my phone doesn't have a noise or sound that exceeds
>> -20dB until 10 minutes 47 seconds.
>>
>> The output file left by the first command has the first 2,5 seconds
>> missing and starts directly with a sound. Where in the recording
>> on my phone that sound starts at 2,5 seconds.
>>
>> The second command as it seems left an output file that sounds
>> like it plays at twice the speed. Coincidentally it's about half
>> the size and duration. But everything seems to be still there
>> and nothing is removed.
>
> I was confused by this at first since it doesn’t seem consistent with what
> you described before but is this the result when the sample you sent us is
> used with the same commands?
>
>> Unfortunately i can't send a more extensive logging because it seems
>> when -loglevel or -v is used i get no output in console at all.
>
> No output at all is weird, but did you set -loglevel $LEVEL where LEVEL is
> quiet, panic, fatal, error, warning, info, verbose, debug, or trace?
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