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• avformat/movenc : add ICC profile support to colr atom

  23 septembre 2019, par vectronic

  avformat/movenc : add ICC profile support to colr atom
  If 'write_colr' movflag is set, then movflag 'prefer_icc' can
  
  be used to first look for an AV_PKT_DATA_ICC_PROFILE entry to
  
  encode.
  If ICC profile doesn't exist, default behaviour enabled by
  
  'write_colr' occurs.
  Signed-off-by : vectronic <hello.vectronic@gmail.com>
  

  • [DH] libavformat/movenc.c
  • [DH] libavformat/movenc.h

• What does profile means in an aac encoded audio

  22 avril 2020, par Ananta Prodhan

  I am trying to concat two video files with ffmpeg concat demuxer for most of the part it works just fine !
But when I try to concat videos which has two different audio profile with same codec, it concats with the resulting video having weird sound problem. And when re-encoding the resulting video it will spit out a lots of error related to audio.

  



  Here is ffprobe output for some audio stream from different video files
Video 1

  



  [STREAM]
index=1
codec_name=aac
codec_long_name=unknown
profile=4
codec_type=audio
codec_time_base=1/48000
codec_tag_string=[0][0][0][0]
codec_tag=0x0000
sample_fmt=fltp
...
[/STREAM]


  



  Video 2

  



  [STREAM]
index=1
codec_name=aac
codec_long_name=unknown
profile=1
codec_type=audio
codec_time_base=1/48000
codec_tag_string=[0][0][0][0]
codec_tag=0x0000
sample_fmt=fltp
...
[/STREAM]


  



  Video 3

  



  [STREAM]
index=1
codec_name=aac
codec_long_name=unknown
profile=28
codec_type=audio
codec_time_base=1/48000
codec_tag_string=[0][0][0][0]
codec_tag=0x0000
sample_fmt=fltp
...
[/STREAM]


  



  Look the different profile= values.I was able to reproduce 28 and 1 but was failed for 4

  



  28 = he_aac_v2 1 = ffmpeg default

  



  So what I want to know the most is, 
What does these different values mean for aac ? 
And how to reproduce them with any aac encode ?

  


• PHP ffmpeg - save mp4 as H.264 in Baseline profile

  2 mai 2020, par Pikaboo

  I'm trying to play a mp4 file in android but it's not working.

  



  According to Android VideoView Cannot play video mp4

  



  the file needs to be H.264 in Baseline.

  



  I don't know what the hell this means.

  



  This is the PHP code I'm using to create mp4 :

  



  $videoname = str_replace('.gif', '.mp4', $picname);
$ffmpeg = FFMpeg\FFMpeg::create(array(
    'ffmpeg.binaries'  => 'ffmpeg/bin/ffmpeg.exe',
    'ffprobe.binaries' => 'ffmpeg/bin/ffprobe.exe',
    'timeout'          => 6600, // The timeout for the underlying process
    'ffmpeg.threads'   => 12,   // The number of threads that FFMpeg should use
), $logger);

$video = $ffmpeg->open('memes/' . $folder . '/' . $picname);
$video
    ->save(new \FFMpeg\Format\Video\X264(), 'memes/' . $folder . '/' . $videoname);


  



  How can I set it to be H.264 in Baseline profile ?