I wanted to create a simple GUI app which selects one of the MP3 files and plays it. Can't seem to find the best library for doing that with PyQT. Therefore need some recommendation on it. Don't mind switch to JavaFX or something if it has more options.
I know GUI is probably outdated nowadays when everything is web. Would Javascript be a better choice?
try vlc module for python to play all types of audio and videos in case needed later. You should make use of the Qt example seen in examples folder when you unzip the downloaded tar file
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I have a purely front-end app (running locally without a proper back-end), and I would like to programmatically generate a downloadable video file (for instance a .mp4). No audio, each frame of the video will be generated from a canvas (or I guess an OffscreenCanvas) using PIXI, and I would like the video to be generated as fast as possible. I’m using Chrome, and I don’t really need to support any other browser.
I've investigated a bit my options and here is what I found:
MediaRecorder, it can directly generate an mp4 file, but the problem is that it only seems to support real-time encoding, which is too slow for me.
VideoEncoder (Chrome only, but that’s not a problem), it can encode frames as fast as the hardware/software permits, but it seems to only create raw video data, which then needs to be containerized in order to make a proper video file.
Assuming the second option is the most promising, I found a few npm packages for manipulating mp4 files:
mp4box, which does not have many downloads (I would prefer not to rely on possibly unmaintained libraries), and there is no clear example of generating an mp4 from scratch anyway, so I’m not sure it supports it.
mux.js, which has more downloads but seems very technical to use, and again I don’t see any simple example of containerizing raw video data.
Is there a way to combine those approaches, or any other way that I have missed?
I'm in a little over my head with a project for a client, they want to build an audio editor that will allow the user to trim their uploaded audio files and save them. I've built the file uploader, and the detail view for the individual audio files, my question is how would this best be implemented? I've been looking at
Peaks.js
and I want to make sure thats the right way to go before diving in. Never used npm in a django project before, is it like using any other js library?
I've also been told about sox, which is great for manipulating the sound files, but what about displaying the sound to the user/editing in the browser?
Any help or general direction-pointing would be greatly appreciated and could save me a bunch of time potentially.
I've been searching how to implement a web application which provide the functionality to edit videos. just like the youtube Editor. What are best and free libraries out there for building a web app like this?. A library which support react would be great!.
This might be the one you are looking for html5-videoEditor. This is more of a proof of concept than a fully functional web-application. Right now it allows you to load videos into the browser, they get automatically uploaded via WebsSocket to a node.js application, where those assets get transcoded (H264/WebM/OGG). Then you can create a composition (=new video), copy videos to the stage, trim them, transform them, stack them and then finally encode them on the server-side using AviSynth and ffmpeg Currently each encoding job will produce a H264 encoded video.
I have used html audio tags for playing multiple mp3 file in browser. I want to know if it is possible to record these mp3's into a single mp3 file in javascript(specifically)?. Or even if any module which can help me record these playing mp3's.
Generally, no.
It is possible to work with audio in JS but probably not in the way you want. See this question for more info.
I don't know what exactly you're trying to do but it seems like you would need to do it server-side, and even that would take effort to achieve (Since you would need to find a library that could merge multiple MP3s into a single file and then serve that as a download to the user. This would also require you to know how to install such software and make it available to your server-side code).
I've built a little app engine app that lets users upload short recordings. Some of the recordings are done in-browser with https://github.com/mattdiamond/Recorderjs, which creates wav files. To save space, I'd like to convert those to ogg before writing them to the app engine datastore, so that I use less of my outgoing bandwidth when I play the audio recordings back to users.
How can I do this? I googled around, and apparently there's a command line tool called oggenc that encodes to ogg -- but I'm pretty sure I can't install that (or, even if I could install it, make calls to it) on app engine.
I found a similar question at Encode audio from getUserMedia() to a .OGG in JavaScript -- this links to https://github.com/jpemartins/speex.js, a project that looks like it might eventually be able to convert from wav to ogg in javascript (which would be great), but, as far as I can tell, does not do so at the moment. At https://github.com/jpemartins/speex.js/issues/4 the authors mentions that WAV -> ... -> OGG is not yet possible.
What else should I try?
Edit: My app engine code is written in Python, so another possibility would be to do the conversion there, with a python module that can convert wav to ogg. I think http://pymedia.org/ can do this, but I'd have to somehow install it on app engine -- is that possible?
Pymedia isn't pure python so you won't be able to use it on app engine.
You probably want to build something on Compute Engine to do this.
Provided it's possible to replace Matt Diamond's recorderjs with its fork, chris-rudmin/Recorderjs (demo page) in AppEngine, this should be feasible. Or first encode to WAV and use opusenc.js (demo page), which is an Emscripten port of the Opusenc tool, to convert a temporary WAV file to Ogg-Opus client side.