Develop Reference

Which video format and Codec in iOS, is supported in Android?

I am recodring video via UIImagePickerController. Then I upload my video to PHP server. But Android is not able to play video after downloading it from server.
UIImagePickerController returns video in .MOV format. I save this video in .mp4 format (just by changing file extension according to Second answer in this question) . To play it in android.
In iOS i am able to play video after downloading it from server but not in android. I think this is codec issue. Android does not support all iOS video codec. Someone please help :)
What should I do so that Video is compatible on iOS and android both.

Audio encoding from 3gp to mp3 files in android

How can i convert my recorded audio files to mp3 format..so that
they can be played on any of the browser i already searched through the web to much
but did not get anything useful .
by default android is making a 3gp file using AMR_NB encoding.

how to save the mjpeg stream as 3gp or mp4 format video files to the sdcard in android

i have saved the mjpeg stream to the sdcard as xxx.mjpeg .However, the mjpeg video file was not supported in android. so how could i encode mjpeg video into 3gp or mp4 format and then store them on sdcard ,at last ,i can play back the 3gp or mp4 video on my android phone ,thanks in advance.

I am not aware of state of mobo's ffmpeg source out there. I had built it long back.
I tried the rockplayer's ffmpeg port. This has hassle free build.
I was able to build it today successfully on NDK_r4b.
You can download the source from here : http://www.rockplayer.com/tech_en.html
modify the config.mk to change your tool paths and run build_andriod.sh (spelling is wrong, but it works :) )
let me know how it goes

There is no way you can achieve this with current Android API.
You need to encode the frames using an encoder in C++ and pass your bitmaps to the encoder via JNI.
You can start with MoboPlayer's ffmpeg port. You may find the download link to their ffmpeg port at the bottom of this page
If you have the image sequence in Bitmaps, you can access the Bitmap's buffer from JNI using the AndroidBitmap_* methods and pass it on to ffmpeg for encoding

Android VideoView streaming

I have a project with a VideoView in it I am streaming a video from online using this method:
mVideoView.setVideoURI(Uri.parse("http://db.tt/ij7w1Nw"));
My videos are mp4 files downloaded from Youtube. I then upload them to my dropbox, that is where the url comes from. This works fine if I download the video and do not make any changes to it, and upload it straight to dropbox. However if I try to make any changes to it for instance convert from .flv to .mp4, or change the size, then I upload it to dropbox it no longer plays in the VideoView. I get a dialog that says 'Unable to play video. Invalid streaming data'. If I take this same exact video and put it on the SD card either manually or even by having my app download it from the url then play it off of the SD card using
mVideoView.setVideoPath(path);
it works fine. I am using Wondershare Video Converter Platinum to do the conversions and size changes.
Is there some sort of specific encoding that is required to stream an mp4 file rather than play it from a local copy? Am I getting this because of some sort of bug/error with wondershare? Has anyone else experienced this type of problem, if so how did you end up fixing it.
Thank you.

The media format guide may help you see what's available. In my experience wrapping a H.264 AVC or MPEG 4-encoded video in a 3GPP container provides the easiest integration. Android is very fickle with both audio and video streaming.

How to convert 3GP video for Android to view?

I'm creating 3GP videos with the Android - however, when the 3GP files are posted on a site, the same Android phone cannot view it back. (The file works on the iPhone).
What is right way to encode/resize the 3GP video so that the video player on Android can play it back?
Thanks

Solved this by converting it to MP4 and then recompiling the Nginx server to have the MP4 streaming module. By default, Nginx mimetype was set to [application/octet-stream] instead of [video/mp4].

This seemingly was resolved on Froyo handsets - at least, when a 3gp file is opened in a browser window using http, and not rtsp, the video plays fine. On 2.1 it doesn't.

To make mp4 video streamable, you should change it's 'atom' byte order.
I'm using qt-faststart tool from ffmpeg package for this.
This tool changes the order of some meta-data inside mp4 container and as result allows to perform video "streaming" over HTTP.