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• How to encode video with ffmpeg for playback on Android ?

  3 janvier 2012, par Sean

  I've got a c++ library that is encoding video in realtime from webcams to mp4 files (H264). The settings i've got are as follows :

      codecContex->profile=FF_PROFILE_H264_BASELINE; //Baseline
  
      codecContex->gop_size=250;
  
      codecContex->max_b_frames=0;
  
      codecContex->max_qdiff=4;
  
      codecContex->me_method=libffmpeg::ME_HEX;
  
      codecContex->me_range=16;
  
      codecContex->qmin=10;
  
      codecContex->qmax=51;
  
      codecContex->qcompress=0.6;
  
      codecContex->keyint_min=10;
  
      codecContex->trellis=0;
  
      codecContex->level=13; //Level 1.3
  
      codecContex->weighted_p_pred = 2;
  
      codecContex->flags2|=CODEC_FLAG2_WPRED+CODEC_FLAG2_8X8DCT;

  This creates MP4 files that play on iOS devices and on Windows Phone 7 devices but not on Android devices. I've read that Android only supports movies encoded with the baseline profile. These settings should produce a baseline movie but when I look at the generated MP4 file with MediaInfo it says it's AVC(High@L1.3). This might be why it's not working but I can't seem to get it to generate something with AVC(Baseline@L1.3)...

  If I remove the last line :

  codecContex->flags2|=CODEC_FLAG2_WPRED+CODEC_FLAG2_8X8DCT;

  Then MediaInfo reports the file as being "AVC(Main@L1.3)" instead - but those flags are part of the Baseline profile !

• FFMPEG video joiner

  31 mars 2012, par Udhay

  I am working on merging videos, but is not merging my videos. Here is the code

  exec(cat file1.flv file2.flv > trailer/output.flv);<br />
exec("ffmpeg -i trailer/output.flv -sameq trailer/output.flv);

  But if the size of file1 is 1MB and file2 is 2MB and output is coming as 3MB. But it is playing only the file1.

• live streaming video file from iphone to internet using FFMpeg

  18 avril 2014, par Luis Mok

  i am trying to live streaming some video content from iphone to the internet (or server). I have read the following post (http://stackoverflow.com/questions/4084811/iphone-http-live-streaming-without-any-server-side-processing)

  And i understand i can first capture the images and audio into file then send it out to the internet. But i really have no idea how to start the work on constantly send out these video files.

  I understand i can use ffmpeg to do the streaming part. after long researching i can only found a sample program called iFrameExtractor using FFmpeg library. But the sample only shows how to use ffmpeg to playback a video file, but no sample on how to use the live streaming function in ffmpeg...

  Can anyone provide a direction or tutorial how to live streaming a video file using ffmpeg ? or anyone can suggest other ways to solve this problem ? i am sure lots of people want to know how to do that.