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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.
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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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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 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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Need to find if there is a open source project for audio signal processing, just as we have openCV for image processing.
Thanks
In my course for the more technical part, we were introduced to signal processing, we had to use Octave with the audio package and gnu plot for plotting.
For the fun part of the course used MaxMSP/Jitter which is a commercial project,
but there's always PureData which is opensource and the Jitter equivalent would be PD Gem, but just for audio signal processing you should be fine with PureData.
In short, if you're into the number crunching bit, Octave should be fine.
We also did the image processing in Octave too, it's two dimensions as opposed to one(sound), but it's still signal processing. You can apply a high-pass or a low pass filter to an image too, you can try an echo/delay on images for fun if you like.
Pure Data is a bit different, since you patch cords instead of typing lots of code, but it's pretty fun and one of the advantages is that you can make changes live, while your patch/program is running which makes it great for fast prototyping.
Straying a bit from audio signal processing, if you're into generative music, you should have a look at some opensource projects like ChucK, SuperCollider, ixi
or fluxus...some do cool stuff with Haskell.
Update
On the c++ side you can also check out Dr. Mick Grierson's Maximilian library which also includes a nice little addon for OpenFrameworks
It's also worth checking out Sonic Visualiser and Vamp Plugins (a lot of nice goodies there)
HTH
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Does anyone know a great audio and video file compressor?
I currenting compressing wmv to 3gp with AVS software.
when i compress the file its out 250kb and that only about 2mins and 30 sec of video.
i would like to compress the sound and video smaller so that i can add more time to my video.
FFmpeg is probably the best choice. It has a wide-range of formats, flexibility and codec support. There's little comparison. There are a variety of desktop apps that are built on it too, if you need a UI.
if you are looking for an application super (c) is very good at all sort of video compressions tho it has a pretty weird UI
I'm a huge fan of ffmpeg. Find out what codec and resolution your mobile device wants. If you're lucky, H.264 will be supported. That codec seems to produce excellent compression these days.
Crazy thing I found the other day. I used QuickTime to File->Export->iPhone my 250MB .avi file and it output the file into four new/different files. Three were in .m4v format and varied in size from 62.3MB to 6.8MB. However the fourth file was a .mov file that was only 381 bytes in size. You read that right. It compressed the video from 250MB to 381b or <1KB. If my math serves me right that is over 600K times smaller than the original file.
Just fyi. Hope this helps.