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• Is there a faster video rendering solution than using AndroidBitmap_xxx functions ?

  25 juillet 2012, par Alex

  In my native thread I have FFMpeg getting and decoding frames then putting them in a queue.

  On Java side I have a GLSurfaceView and from Renderer.onDrawFrame I'm calling into the native code passing a bitmap (that bitmap I create only once, then pass it every time).

  In the native code I get the head of the queue, copy data to the java bitmap using AndroidBitmap_xxx functions, then render that Bitmap on Java side as a texture.

  I wonder is there a faster way to render video ? Shall I do it entirely in the native code, if yes, why it will be faster ?

  Edit : I now don't copy RGB frame pixels to the locked bitmap pixels, rather I decode YUV frame directly into the locked bitmap pixels. This makes rendering significantly faster (because no unneeded memcpy anymore) still the question remains.

• Need help understanding HTML 5 audio/video meta data use and placement

  27 juin 2012, par nicoz

  I have spent a significant amount of time researching HTML 5 audio and video, however I am stuck understanding the encoding of the meta data. It seems that in my research, using programs like Handbrake (ffmpeg) it is recommend to check of "web optimized" (There is also a similar type of setting when exporting from other types of software, like imovie). I have concluded (and correct me if I am wrong) that this has to do with moving the file's meta data to the beginning of the file. This then gives the player/browser the info it requires to play immediately without having to wait to load the entire file.

  So here is where I am confused and the question I need help with

  Does this only apply to the mp4 MOOV atom ? Or is there something similar in .ogv and .webm files ?

• Truly live streaming to Android/iPhone

  4 juillet 2012, par Tsaukpaetra

  I have spent quite a while (past week) trying this to little avail. However, what I want seems completely unheard of. So far, I have reviewed recommendations available through google, which include encoding a static file into multiple static files in different formats, creating a playlist that hosts static files in an m3u8 file (files which get added to the playlist as streaming continues).
  I have also seen ideas involving rtmp, rtsp etc which are completely out of the question because of their incompatibility.
  Ideally, I would have one webpage that would link to the stream (http://server/video.mp4) and/or show it in a webpage (via the video tag). With that in mind, the most likely format would be h264+aac in mp4 container.

  Unfortunately, (and probably because the file has no duration metadata) it does not work. I can use a desktop player (such as VLC) to open the stream and play it, but my iPhone and Android both give their respective "Can't be played" messages.

  I don't think the problem is caused by the devices' ability to stream, for I have made a streaming shoutcast server work just fine (mp3 only).

  Currently, the closest I have become is using the following setup on my win32 machine :

  FFMPEG Command: : ffmpeg -f dshow -i video="Logitech Webcam 200":audio="Microphone (Webcam 200)" -b:v 180k -bt 240k -vcodec libx264 -tune zerolatency -profile:v baseline -preset ultrafast -r 10 -strict -2 -acodec aac -ac 2 -ar 48000 -ab 32k -f flv "udp ://127.0.0.1:1234"

  VLC: : Stream from udp ://127.0.0.1:1234 to http:// :8080/video.mp4 (No Transcoding), basically just to convert the UDP stream into an http-accessible stream.

  Any hints or suggestions would be warmly welcomed !