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• can i mux h264 stream into mp4(aac) through libavformat without libx264 ?

  6 septembre 2011, par Faller

  i just have h.264 encoded video stream and i want to make mp4 file.

  /* find output format for mp4 */

  m_pOutputFormat= av_guess_format("mp4", NULL, NULL);

  if (!m_pOutputFormat) return FALSE; // could not find suitable output format(mp4).

  on this code, i get mpeg for video codec not h264, i think that's because i build ffmpeg without libx264. (and i dont want to build ffmpeg with libx264 for license)

  m_pOutputFormat->video_codec= CODEC_ID_H264;

  when i change its video_codec to CODEC_ID_H264, it works fine some player(kmplayer). but it's not work on ipod, QuickTime.

  this code maybe wrong because it could not change codec_tag value(this variable has const property).

  
  

  1. how can i get other result for av_guess_format("mp4",NULL,NULL) without recompile libav+libx264?

  2. how can i make mp4 file properly?

• how to convert mp4 to mp3 by ffmpeg ? [migrated]

  6 septembre 2011, par user916350

  I need convert from mp4 video to mp3 (extracting audio track) by ffmpeg. I can do that for .flv -> mp3, but I don't know command line parameters for mp4->mp3. For example, for flv->mp3: 'ffmpeg -i video.flv -acodec copy audio.mp3'. Tell me parameters for mp4->mp3 please. Thank you, anyway.

• Issue with Decoding H.263 Sorenson Spark D frames

  6 septembre 2011, par nitin goyal

  I am trying to decode the H.263 sorenson type of data using avcodec_decode_video function.

  It is able to decode the I and P frames but i have some D frames (Disposable inter frames) in my data and this function is not able to decode these frames and I am getting zero as return value.

  So, can somebody tells me how we can decode these type f frames as I am not finding any mention of D frame sin the ENUM value also.

  I have read somewhere that we can convert D frames into P frames but if we have raw data how we achieve that if we want to use the decode function directly.

• Java - xuggle/ffmpeg - moov atom not found

  5 septembre 2011, par Mark Design

  I am trying to read a mov file from local using Xuggle. This gives me the following error:

  30-mag-2011 15.56.55 com.xuggle.ferry.NativeLogger log
  GRAVE: [mov,mp4,m4a,3gp,3g2,mj2 @ 0x102840600] moov atom not found
  

  The problem is that until two minutes before it didn't give any error and the code was the same.

  However, I discover this:

  If I open the IContainer using a byte array it doesn't work and gives me the error:

  ByteArrayInputStream b = new ByteArrayInputStream(file);
  DataInputStream data = new DataInputStream(b);
  IContainer container = IContainer.make();
  if (container.open(data, null) < 0)
      throw new IllegalArgumentException("E001 - Cannot open the container");
  

  if I open the IContainer using a temporary file it works.

  File temp = File.createTempFile("temp_", ".mov");
  
  try
  {
      FileOutputStream fos = new FileOutputStream(temp);
      fos.write(file);
      fos.close();
  }
  catch(FileNotFoundException e)
  {
      System.out.println(e);
  }
  
  IContainer container = IContainer.make();
  
  if (container.open(temp.toString(), IContainer.Type.READ, null) < 0)
      throw new IllegalArgumentException("E001 - Cannot open the container");
  

  any suggestions?

  Thanks! Mark

• ffmpeg : how to convert iphone4 720p video into similar quality Flash video ?

  5 septembre 2011, par Sajee

  What are the proper arguments to ffmpeg to covert an iphone4 720p video into the similar quality Flash video?

  I tried the following which resulted in a low quality Flash video:

  ffmpeg movie.mov movie.flv
  

  What are the right switches?