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• Cannot modify AVRational time_base on Android

  31 octobre 2012, par tunght_53

  I have successfully built ffmpeg for Android and recorded several videos. Here is the example code from the library which I used to record the video

  /* put sample parameters */
  
  c->bit_rate = 200000;
  
  /* resolution must be a multiple of two */
  
  c->width = width;
  
  c->height = height;
  
  /* frames per second */
  
  c->time_base= (AVRational){1, 25};
  
  c->gop_size = 10; /* emit one intra frame every ten frames */
  
  c->max_b_frames=1;
  
  c->pix_fmt = PIX_FMT_YUV420P;

  However, my phone is quite a low-end phone so it can only record video with a frame rate of about 8fps. I tried to set c->time_base= (AVRational)1, 8 ; and other values as well but I always receive the error message : "could not open codec". When I turn it back to 25, everything works well.

  Can you please help me with this. Many thanks in advance.

• Android : mp4 file plays when downloaded but when choosing "Video" player gets "Cannot play video"

  14 janvier 2014, par gview

  I've converted the video to an mp4 with ffmpeg using the h264 codec and AAC, and used the baseline profile.

  Videos are 540x360x250kbps

  I then ran qt-faststart on the file to move the atoms into the right order.

  I've stuck the file up on a wiki we use and created a link to it.

  My test phone is a Samsung Galaxy S3.

  When I browse to the page that has links to the mp4's on it, and I click on them, I get a popup window with 2 options : Internet and Video.

  If I download the videos using the "Internet" option, I can play them on the phone without issue.

  I've done other encodings with the main profile as well, and these also play fine. I thought that a powerful phone like the s3 would be able to handle the more advanced compression schemes available in h264, however I've also browsed the Android docs in regards to supported video formats, and it seems to state that only the "baseline" compression profile is supported.

  Regardless, what doesn't work is trying to use the "Video" option which I assume tries to stream the video.

  For the wiki in question, clicking on the link reveals that the content-type and content-length headers are being set :

  Content-Length  6175996
  
  Content-Type    video/mp4;charset=UTF-8

  Clicking on the link with a browser invokes a player (Quicktime in most cases) that can play the mp4's.

  Is there more to having the file HTTP streamable beyond making a link to it ? Why won't my Android 4 play these files ?

  UPDATE :
  I decided to make a quick HTML5 page using the video tag, and the videos do play on both my Galaxy S3 and the latest IOS.

• Disable image resizing on the Basic Plus and AngularJS demo for Android and Opera.

  12 juin 2013, par blueimp

  Disable image resizing on the Basic Plus and AngularJS demo for Android and Opera.