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Is there any script/tool out there (any language) that will generate .wav file into a waveform image?
Basically I want to upload a small wav file on the web and it will then show an image of waveforms including numbers of seconds (duration).
PS: I did google but no luck.
https://bitbucket.org/corfr/wavegenerator/src
A friend did this one :
You need linux (i successfully use Centos & Ubuntu)
Libmad
If i remember that was enough, it generate a .png from a .mp3 file, using libmad so. Code is quite simple to understand, as always feel free to submit improve !
it will generate a waveform pretty close as what you can found on soundcloud for example...
EDIT: Since you're looking for waveform, this question is very related.
https://stackoverflow.com/questions/2381243/how-does-soundcloud-com-generate-the-waveform-for-their-mp3-player
EDIT: This answer is valid if you're looking for a way of showing frequence graphically.
SoX ( http://sox.sourceforge.net/ ) can run on Windows and it's installed or available in almost all Linux distribution.
It can generate a spectrogram in .png format. Just call it like this:
sox <inputfile> -n spectrogram
You will find spectrogram.png in the same directory.
Here is an example of a spectrogram produced by SoX:
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I have a few hundred audio files of spoken lectures. I need a piece of software I can call from the command line to process the audio in various ways e.g. changing format, normalising, etc.
So far I have tried to batch process files using Audacity using a chain as detailed in this video. However, this is not satisfactory as I can't call this from command line (and therefore batch process files in a flexible way adapting to size/filetype etc.).
Are you able to point towards any software that can do this kind of audio processing from the command line?
Depending on your requirements, you don't always have the use Audacity.
You can use SOX in order to achieve what you are trying to do in terms of getting the file information of an audio file, as well as carry out compression.
sox long.mp3 short.mp3 trim 10
For comparison etc..
To expand, you can use a bash script, to iterate through each of the files in a directory and then run the command on each of the files.
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I have video which contains 700mb(5 min duration) size. I want to reduce the file size to less then 30 mb .
I have go through the FFMPEG blog and successfully run the samples. But the problem in that library is, it will take too much of time to compress a video file(146 mb take 20 minute). so looking for a good library or right path to achieve my requirement.
My application support from android api-9 and above.
The public APIs for access to hardware video codecs was added in API 16, though it didn't really stabilize until API 18. See the docs for the MediaCodec class. Some examples are available here.
For API 9+ you're generally limited to software solutions like ffmpeg.
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I need to add some mp3 file playing functionality to my Linux based embedded application. Until now I used a system call (mpg123 -qm list of mp3 files). But now I don't have all the elements of the playlist, but get the next one only when I'm ready with the previous one. With mpg123 it means that I have some stupid noise between the tracks, as I always have to restart the mpg123 binary.
I was looking around for some libraries and found libmad, lame, sdl and co. But they seem to be a bit overcomplicated at first to handle. I found the fmod (http://www.fmod.org/index.php/download) library easy to use. But it's available only in binary format, which doesn't fit my ARM-based target (not to mention the licensing problems). Does anybody know about any similar, open source library capable of playing mp3 files similar to fmod?
mpg123 has an API, perhaps you could use that instead of calling the binary?
OK, finally with the help of houbysoft's hint i found a solution which uses libmpg123 and libao, here, and with some tuning i managed to get pretty smooth file-by-file playing. Thx for the hint!
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I would like to ask you to recommend me a C/C++ library to capture video.
I am getting frames from a camera at 16 bits per pixel (RGB), and I would like to save those frames in a video format in an efficient way to be able to look at it in the future.
Would you please recommend me a good C/C++ library that I can use under Linux please?
A Google search gives me a lot of libraries, and I am really not sure which one does a good job and is widely used. I would greatly appreciate your help.
Thank you very much.
As far as I know -- the predominat library is Video4Linux -- however I have not tried it myself, but the list of applications using/supporting it is impressive.
Addition:
For Multi media Encoding GStreamer is probably one of the most used frameworks.
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I'm looking for (linux) command line tools that can help with video editing. I am mostly interested in:
Cutting
Transitions
Effects
Any pointers would be appreciated (I know ffmpeg can do basic cutting, but not much beyond that afaik).
Two tools I use are transcode and mencoder.
Transcode is a suite of command line
utilities for transcoding video and
audio codecs, and for converting
beween different container formats.
A variety of video and audio pre and
post-processing filters are available,
including (but not limited to):
framerate conversion
smoothing
cutting
MEncoder is a free command line video decoding, encoding and filtering tool based on mplayer.
Avisynth under WINE is your best bet. You can use ffmpeg or mencoder to do the actual encoding, and avisynth .avs files for the actual editing. You may have to use mencoder under WINE to access the avs files as well. I haven't tried this myself, but it should work, barring any WINE issues.
If this is part of some production app, if there's any way you can farm the work out to an actual windows computer you'll save yourself a lot of pain.
If you want to get your hands dirty you could try using the gstreamer and Gnonlin to make your own CLI video app. You can actually use a language like Ruby to call gstreamer from, so you don't have to use C.