How to programmatically create videos?
I know there's mencoder (part of the mplayer project), and ffmpeg, which both can do this.
Create a video form images and videos and add audio to it programatically | Java, Python, ffmpeg
You can do the same with the audio, use -ss
and -t
input options to control where to clip it.
String ffmpeg = Loader.load(org.bytedeco.ffmpeg.ffmpeg.class);
ProcessBuilder processBuilder = new ProcessBuilder(
ffmpeg,
"-loop", "1",
"-framerate", "30",
"-t", "4",
"-i", "image1.jpg",
"-i", "video1.mp4",
"-loop", "1",
"-framerate", "30",
"-t", "4",
"-i", "image2.jpg",
"-loop", "1",
"-framerate", "30",
"-t", "4",
"-i", "image3.jpg",
"-t" 4, "-i", "audio1.mp3",
"-ss" 4, "-t", 8, "audio1.mp3",
"-filter_complex",
"[0][1:v][2][[3]concat=n=4:v=1:a=0;[4][1:a][5]concat=n=3:v=0:a=1;",
"finalVideo.mp4"
);
processBuilder.inheritIO().start().waitFor();
(not 100% if you can use the same input file twice, but this should work.)
Create videos programmatically?
I'm guessing what you're looking for will be built in Ruby, and probably not use any of Rails.
The only way that I know how to do this is to create a SWF using Ming.
There's a pretty good example on how to use it here
Programmatically creating a list of videos
If you are using a WebView to create your playlist, then I would recommend using JavaScript interfaces inside the WebView so you can send information between your activity and the WebView, so when the user clicks a thumbnail you can send the activity the "id" of the thumbnail the user clicked.
Tips:
To add an interface you do it this way
WebView web = new WebView();
web.addJavascriptInterface(new classWhereTheMethodsAre(), "nameOfTheInterface");
To call the method from inside HTML
nameOfTheInterface.nameOfTheMethod(Parameters);
I hope this tips can help you, if you have another question please post it here, and I will try to solve it or maybe give you an snippet.
UPDATE:
If your images come from the "internet" (HTTP or something like that), then you can just put the URL in the HTML code like you would normally do so, or you can download them to the SD CARD (with your asynctask class) and then have a listener to advise you when the image is completely downloaded so you can "lazy load" the part of the code where you "insert" the image to the HTML page. The lazy load can be achieved with the code provided in the link and to call it you can do a YourWebView.loadUrl("javascript:functionThatCallsTheLazyLoad(Parameters)")
I hope this update can help you with your problem.
Programmatically how to create Video in android
Fortunately, this is not possible, except perhaps on rooted devices, for obvious privacy and security reasons. An app cannot record what other apps show on the screen.
Programmatically generate video or animated GIF in Python?
Well, now I'm using ImageMagick. I save my frames as PNG files and then invoke ImageMagick's convert.exe from Python to create an animated GIF. The nice thing about this approach is I can specify a frame duration for each frame individually. Unfortunately this depends on ImageMagick being installed on the machine. They have a Python wrapper but it looks pretty crappy and unsupported. Still open to other suggestions.
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