How can I convert audio .wav to .m4a programmatically using API 14?
MediaCodec and MediaMuxer supported on latest versions API.
FFMPEG is a viable options that seems to be reliable. I'm currently using it in a production app and it does it's purpose.
Related
In my project I need to implement an HLS (HTTP live Streaming) for an android device and it stream to an iOS device to play where android device will record the video and send it to server and iOS device will play the stream from the server using an m3u8 file. In the link below
Click Here
They have mention "Currently, the supported delivery format is MPEG-2 Transport Streams for audio-video".
Now problem is that in android you can record only in mp4 by default (correct me if i am wrong). Now I need some third party API or library like ffmpeg, Gstreamer, Xuggler, Jcodec to transcode recorded mp4 to ts files.
ffmpeg, jffmpeg and Gstreamer have a learning curve and to setup time and also need NDK. So I need some help because I don't have enough time to try one of these please refer me if you know any library which is easy to use and does not have a complex learning and setup time. Like Jcodec which is pure java base and plug and play type library but I don't think it can do this for me as they have mention in there documentation they support h262 codec support yet but i need h264 and ACC for audio.
FYI:
JJPMEG
It is a Java binding to FFmpeg and it have an android verison too. Maybe you can give it a try.
https://code.google.com/p/jjmpeg/
Or:
Maybe you can just record the video with supporting encoding and transcode the video in the server side?
My application(android 2.2 and later) needs to convert raw PCM audio recorded at 22kHz to AAC- (22 kHz) format. But the MediaCodec API is only available in android 4.1+ .
Is there any way i can convert pcm to aac in android 2.2 and later ?
FFmpeg for Android is a good way to go. Makefiles are tested only on mentioned targets, it doesn't mean they will not work on Froyo (and I believe they will). It is just that I do not have resources to test every possible build scenario. What I currently support is already too much for my equipment.
Starting from Android 4.1 (API level 16) MediaCodec APIs have been introduced. These APIs support Elementary stream Decoding & Encoding. Also MediaExtractor API will give elementary track details by analyzing Media streams.
My Question is, I setup a video encoder using MediaCodec API, which gives me encoded file in .h264 format. I want to write .h264 file into a .mp4 file for playing/storing/sharing purposes. I don't find any .MP4 file-writer API for android. Is there any way to achieve it?
Thanks,
Satish.
As of Android 4.3 (API 18) you can use the MediaMuxer class to convert the raw H.264 stream to a .mp4 file (and even merge an audio stream in).
See the EncodeAndMuxTest and CameraToMpegTest sources on this page for sample code.
This response may be of use. It suggests using the isoparser library. It works pretty well if you have elementary streams saved to disk, but it doesn't work if you want to live stream from the MediaCodec output.
Another way is to use FFmpeg (http://sourceforge.net/projects/ffmpeg4android/) for muxing h264-file to mp4 container.
Is there any way to record & edit audio files using ADPCM codec in Android?
Apart from AMR_WB & AMR_NB audio codec; which all other open/standard codec supported in Android?
You should look into Android official Documentation for this apart from that you can support many other formats in your app by compiling FFmpeg library
http://developer.android.com/guide/appendix/media-formats.html
I have simplified my question and offered a bounty:
What options are there for compressing raw PCM audio data to a mp3 on a Android device.
My original post:
I'm creating a synthesiser on my Android phone, and I've been generating PCM data to send to the speakers. Now I'm wondering if I can encode this PCM data as a mp3 to save to the sdcard. The MediaRecorder object can encode audio coming from the microphone into various formats, but doesn't allow the encoding from programmatically generated audio data.
So my question is, is there a standard Android API for encoding audio? If not, what pure Java or NDK based solutions are there? And can you recommend any of them?
Failing this I'll just have to save my generated audio as a WAV file, which I can easily do.
Pure Java
Look into Tritonus's clean room implementation of javasound which offers an MP3 encoder plugin here: http://www.tritonus.org/plugins.html
Secondly, I would suggest looking into jzoom's libraries JLayer or JLayerME: http://www.javazoom.net/javalayer/javalayer.html (this may only be decode, not sure)
If those doesn't suit your need you can look at this article from 2000 about adding MP3 capabilities to J2SE (with source): http://www.javaworld.com/javaworld/jw-11-2000/jw-1103-mp3.html
Native route
If you want "native" performance I would look at an FFmpeg or Lame port for Android.
Lame: http://lame.sourceforge.net/
As far as i know you can't do this using only the tools in the SDK. According to the official developer guide there isn't an MP3 encoder in the platform (Android Supported Media Formats), so you have to port an encoder on your own using the NDK, then write some wrapper code to receive the audio samples through JNI.
I'm currently working on porting some audio decoders from the Rockbox project for my own music player, and it can record audio into MP3, so maybe you should try to look into it's source and find the encoder library. Most of the decoders have ARM optimalizations which speeds up things noticable, so i guess some of the encoders have also this addition.
Mp3 encoder is not available in android.you have to compile libav with mp3 lame lib you can find code from
http://libavandroid.wordpress.com