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• encode x264(libx264) raw yuv frame data

  26 juin 2015, par Mohamed El-Sayed

  I am trying to encode an MP4 video using raw YUV frames data, but I am not sure how can I fill the plane data (preferably without using other libraries like ffmpeg)

  The frame data is already encoded in I420, and does not need conversion.

  Here is what I am trying to do :

  const char *frameData = /* Raw frame data */;
  
  
  
  x264_t *encoder = x264_encoder_open(&param);
  
  x264_picture_t imgInput, imgOutput;
  
  x264_picture_alloc(&imgInput, X264_CSP_I420, width, height);
  
  
  
  // how can I fill the struct data of imgInput
  
  
  
  x264_nal_t *nals;
  
  int i_nals;
  
  int frameSize = x264_encoder_encode(encoder, &nals, &i_nals, &imgInput, &imgOutput);

  The equivalent command line that I have found is :

   x264 --output video.mp4 --fps 15 --input-res 1280x800 imgdata_01.raw 

  But I could not figure out how the app does it.

  Thanks.

• using ffmpeg to convert raw audio data to wav file

  10 juillet 2017, par ingeniouslyfowl

  I have a text file that contains some raw data that I generated from a wav file. I read in a signal from the wav file, and then used

  fid = open("test.raw", 'write')
fid.write(data.tostring())

  to write the raw data to a file. Currently, I’m doing this because I want to be able to append to this file as needed without having to change header information. I’m not concatenating multiple audio files, just processing parts of a signal and I don’t want to have a potentially enormous signal in memory. When I try to use ffmpeg to convert this data using

  ffmpeg -i test.raw output.wav

  I end up getting the error : test.raw: Invalid data found when processing input. I’ve also been going through the ffmpeg docs but nothing I’ve tried seems to be working.

• ffmpeg rotate video according to sensor data

  6 septembre 2015, par oleg.semen

  I’m trying to scale videos down captured by the Android cellphones in order to reduce amount of data to be uploaded to the server. What I’m doing right now is :

  String.format("-i %s -vf \"scale='if(gt(a,1),-1,%d)':'if(gt(1,a),%d,-1)'\" -strict -2 %s", in, h, w, out);

  It scales down well. But users often hold their phoned in different orientation. When original video is played on a device it is rotated according to rotation saved in metadata. But after encoding video does not contain this information.

  How can I perform scaling that rotates video according to this data or at least to store this data in output file ?
  Thanks.