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• dnxhddec : Decode and use interlace mb flag

  26 septembre 2015, par Christophe Gisquet

  dnxhddec : Decode and use interlace mb flag
  This bit is 1 in some samples, and seems to coincide with interlaced
  
  mbs and CID1260. 2008 specs do not know about it, and maintain qscale
  
  is 11 bits. This looks oversized, but may help larger bitdepths.
  Currently, it leads to an obviously incorrect qscale value, meaning
  
  its syntax is shifted by 1. However, reading 11 bits also leads to
  
  obviously incorrect decoding : qscale seems to be 10 bits.
  However, as most profiles still have 11bits qscale, the feature is
  
  restricted to the CID1260 profile (this flag is dependent on
  
  a higher-level flag located in the header).
  The encoder writes 12 bits of syntax, last and first bits always 0,
  
  which is now somewhat inconsistent with the decoder, but ends up with
  
  the same effect (progressive + reserved bit).
  Signed-off-by : Vittorio Giovara <vittorio.giovara@gmail.com>
  

  • [DBH] libavcodec/dnxhddec.c

• How can I add audio (mp3) to a flv (just video) with ffmpeg ?

  18 juillet 2012, par domi

  How can I add sound from a mp3-file to a flv file that has no audio ?
  (With ffmpeg)

  When I use

  ffmpeg -i video.flv -i audio.mp3 -acodec copy -vcodec copy -ab 128k -ar 44100 output.flv
  

  I get this output :
  

  FFmpeg version SVN-r12758, Copyright (c) 2000-2008 Fabrice Bellard, et al.
    configuration : —enable-shared —prefix=/usr
    libavutil version : 49.6.0
    libavcodec version : 51.54.0
    libavformat version : 52.13.0
    libavdevice version : 52.0.0
    built on Apr  7 2008 09:00:42, gcc : 4.1.2 20070626 (Red Hat 4.1.2-14)
  [flv @ 0x2b72415e00c0]Could not find codec parameters (Audio : 0x0000)
  Input #0, flv, from 'video.flv' :
    Duration : 00:00:03.2, start : 0.000000, bitrate : N/A
      Stream #0.0 : Video : flv, yuv420p, 468x312, 1000.00 tb(r)
      Stream #0.1 : Audio : 0x0000
  mdb:511, lastbuf:0 skipping granule 0
  mdb:511, lastbuf:0 skipping granule 0
  mdb:511, lastbuf:0 skipping granule 1
  mdb:511, lastbuf:0 skipping granule 1
  Input #1, mp3, from 'audio.mp3' :
    Duration : 00:01:00.9, start : 0.000000, bitrate : 128 kb/s
      Stream #1.0 : Audio : mp3, 44100 Hz, stereo, 128 kb/s
  Output #0, flv, to 'output.flv' :
      Stream #0.0 : Video : flv, yuv420p, 468x312, q=2-31, 1000.00 tb(c)
      Stream #0.1 : Audio : 0x0000
  Stream mapping :
    Stream #0.0 -> #0.0
    Stream #0.1 -> #0.1
  [flv @ 0x2b72415e00c0]sample rate not set
  Could not write header for output file #0 (incorrect codec parameters ?)
  

• Retrieving information from ffmpeg shell_exec command

  29 août 2012, par user1503606

  i am doing the following

  $output = shell_exec('/usr/local/bin/ffmpeg -i intro.mp3 2>&1'); 
  
  echo "<pre>$output</pre>";

  This outputs

  ffmpeg version 0.8.5, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Aug 20 2012 09:28:43 with clang 3.1 (tags/Apple/clang-318.0.61)
  
    configuration: --enable-nonfree --enable-gpl --enable-version3 --enable-postproc --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libfaac --enable-libxvid --enable-libx264 --enable-libvpx --enable-hardcoded-tables --enable-shared --enable-pthreads --disable-indevs --cc=clang
  
    libavutil    51.  9. 1 / 51.  9. 1
  
    libavcodec   53.  7. 0 / 53.  7. 0
  
    libavformat  53.  4. 0 / 53.  4. 0
  
    libavdevice  53.  1. 1 / 53.  1. 1
  
    libavfilter   2. 23. 0 /  2. 23. 0
  
    libswscale    2.  0. 0 /  2.  0. 0
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  [mp3 @ 0x7f9481807c00] max_analyze_duration 5000000 reached at 5015510
  
  Input #0, mp3, from 'intro.mp3':
  
    Metadata:
  
      album           : Frank 
  
      artist          : Amy Winehouse
  
      genre           : R&B
  
      title           : [Intro] Stronger Than Me
  
      track           : 01
  
      date            : 2008
  
    Duration: 00:03:54.71, start: 0.000000, bitrate: 230 kb/s
  
      Stream #0.0: Audio: mp3, 44100 Hz, stereo, s16, 160 kb/s
  
  At least one output file must be specified

  i want to get the information to insert into a database album,artist,genre,title etc

  But all seperately

  i can get them by doing the following

  $output = shell_exec('/usr/local/bin/ffmpeg -i intro.mp3 2>&1'); 
  
  
  
  $edit = explode('  ', $output);
  
  $edit = implode("@", $edit);
  
  $edit = explode(':', $output);
  
  echo "<pre>";
  
  print_r($edit);
  
  echo "</pre>";

  then running

  <?php echo $edit[9]; ?>

  etc

  but this seems like a really bad way and annoying way to get values and sometimes the output is slightly different which messes with the outputs.

  Whats the best way to do this or am i stuck doing this ?