Questions tagged [resampling]
15 questions
21
votes
3 answers
How to change audio frequency?
I want to change the frequency of an audio file. Meaning: the whole file should sound (say) one octave higher or lower. How to do it? Using ffmpeg or other command line open source tool would be preferable.
tanon
- 255
13
votes
3 answers
How should I decide on a default audio format?
I see that Windows sets the default output format at 16-bit, 44100 Hz (CD Quality).
Most of my music is in this format, but most of my movies use a 16-bit at 48 KHz format (named DVD quality in the Sound panel). The Windows system sounds are 16-bit…
Louis Waweru
- 25,409
- 45
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5
votes
2 answers
Resampling embedded raster images in SVG
I have a batch of SVG files with embedded, high-res PNG images. The PNG files have been resized considerably smaller (via transform, matrix, etc). What is the best way to resample these embedded images in place? The goal is to get smaller,…
zourtney
- 903
3
votes
2 answers
Why noises appeared when convert 16bit wav to 8 bit wav, how to avoid it?
We have some 16bit/8000HZ/Mono/PCM .wav files, we need to convert to 8bit to use in our telephone system.
But after conversion, we found there're many noise appeared in the 8bit .wav files even if the whole source sounds are silence. (You can use…
LiuYan 刘研
- 2,775
2
votes
1 answer
LIBFAAC cannot resample channels
Im using avconv to convert video files into MP4, but whenever I try to encode files with 6 or 8 channels into 2 channels using libfaac I get these error messages:
Can not resample 8 channels @ 44100 Hz to 2 channels @ 44100 Hz
(EDIT: the full…
Jimmery
- 630
2
votes
4 answers
How to enhance 22.05 kHz speech audio material for listening purposes to 44.1 kHz?
I have found a really interesting radio novel on the web, and I would like to attract attention of one of my acquaintances to it. Unfortunately the audio material has poor quality, only 22.05 kHz and 1 channel, mono. However it doesn't contains…
Konstantin
- 703
1
vote
1 answer
Why is preserving the pitch in audio playback (allegedly) less performant?
In VLC for Android, i discovered an option to preserve the pitch during faster-than-normal playback:
The "requires a fast device" obviously implies that faster playback is more performant when the pitch is changed too. Why is that so?
What i've…
1
vote
0 answers
Change CAF (Core Audio Format) volume without resampling
I've converted some MP3 files to CAF, but unfortunately all of them have inadecuate volume intensity
Is there a tool to change their volume without resampling, to avoid any possible loss in quality
I used the following command line to do the…
ery245gs
- 365
1
vote
4 answers
How do I rescale large images?
How do I reduce the dimensions of large .png images? I've tried GIMP, Paint.NET, and IrfanView, and they work well for smaller images but won't even open larger ones.
aaa
- 119
0
votes
1 answer
Image Upsampling
I don't know if this specifically belongs on Stack Overflow; but I will post it here with hopes that it will be moved to the right section (if this is indeed the wrong section).
I have Photoshop, and was wondering if there was a way to re-size /…
Brendan
0
votes
3 answers
Converting a .mp4 file throws "Resampling with input channels greater than 2 unsupported." error
I am trying to convert a mp4 file into flv with 2 audio channels & sample rate of 44.1 Khz (because .flv does not allow higher than that). Here is the pastebin for the error.
As seen from the console output, I am using the latst build of ffmpeg.
Chantz
- 153
0
votes
1 answer
Is there a way in linux to change the resampling when outputting a lower resolution to a bigger monitor?
My monitor is 4k but my graphics card isn't great at handling 4k gaming. I want to be able to switch to 1080p. My issue is that 1080p looks fuzzy. An image displayed in 1080p looks fuzzier than the same image upscaled 200% in 4k.
Daffy
- 309
0
votes
0 answers
How do I resample audio to the original stream sample rate in a filter?
I have an audio filter_complex in ffmpeg (4.3.2-2021-02-27-full_build-www.gyan.dev, Windows) along these lines:
[0:a]a_bunch;of_filters;that_end_up;resampling_the_audio;aresample=????[a]
That is, there's a number of filters that end up upsampling…
Jason C
- 11,385
0
votes
1 answer
Is it possible to use Audacity as a simple sample editor?
It's a weird question but here's my workflow.
I want to be able to open a WAV file from other DAWs, like Ableton or Reason in Audacity. Apply some effects and maybe do some slicing, then get the file back into the "master" DAW.
Ableton has this…
Johnny Bigoode
- 124
-1
votes
1 answer
Can increasing sampling rates for (desktop) speakers have negative effects to the speakers and their output?
My brother always sets his sampling rate to the maximum that his speakers are rated by their manufacturer to support. However, defaults are usually chosen for good reasons, and the default sampling rate is usually an order of magnitude…
