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• How to incoporate ffmpeg in my audio input upload form

  3 février 2018, par Michelle Dimwaite

  this is not really a question but a request to point me to any starting direction.
  i have a simple audio upload form which stores the audio to a database or just any folder.
  I want to start by implementing ffmpeg so before this audio is stored in the folder, it goes through ffmpeg(converted to mp3 for example) and stores the converted version to the folder.
  Can someone please point me to any tutorial or links where i can start more research.
  I already installed ffmpeg.exe in xampp
  much appreciated in advance

• ffmpeg - alternative to AVCodecContext::refcounted_frames ?

  18 mars 2014, par Asik

  We are using an outdated version of AVCodec which does not contain the ref-counted frames feature implemented via AVCodecContext::refcounted_frames. Basically, we want to prevent AVCodec from re-using a buffer until we are done with it, which could be at any arbitrary point in the future (and not necessarily before the next avcodec_decode_frame2).

  Using a different AVFrame on each call to decode doesn't do the trick, because AVCodec uses the same buffers internally anyway (different AVFrames may point to the same data).

  Is there a way to do this without using the new features introduced with AVCodecContext::refcounted_frames ?

• avformat/mpegtsenc : Fix mpegts_write_pes() for private_stream_2 and other types

  25 avril 2021, par zheng qian

  avformat/mpegtsenc : Fix mpegts_write_pes() for private_stream_2 and other types
  According to the PES packet definition defined in Table 2-17 of ISO_IEC_13818-1
  
  specification, some fields like PTS/DTS or pes_extension could only appears if
  
  the stream_id meets the condition :
  if (stream_id != 0xBC &&  // program_stream_map
  
      stream_id != 0xBE &&  // padding_stream
  
      stream_id != 0xBF &&  // private_stream_2
  
      stream_id != 0xF0 &&  // ECM
  
      stream_id != 0xF1 &&  // EMM
  
      stream_id != 0xFF &&  // program_stream_directory
  
      stream_id != 0xF2 &&  // DSMCC_stream
  
      stream_id != 0xF8)    // ITU-T Rec. H.222.1 type E stream
  And the following stream_id types don't have fields like PTS/DTS :
  else if ( stream_id == program_stream_map
  
  || stream_id == private_stream_2
  
  || stream_id == ECM
  
  || stream_id == EMM
  
  || stream_id == program_stream_directory
  
  || stream_id == DSMCC_stream
  
  || stream_id == ITU-T Rec. H.222.1 type E stream ) 
  
      for (i = 0 ; i < PES_packet_length ; i++) 
  
          PES_packet_data_byte
  
      
  
  
  Current implementation skipped the check of stream_id causing some kind of
  
  streams like private_stream_2 to be incorrectly written with actually a
  
  private_stream_1-like PES header with PTS/DTS field. For example, Japan DTV
  
  transmits news and alerts through ARIB superimpose that utilizes
  
  private_stream_2 still could not be remuxed correctly for now.
  This patch set fixes the remuxing for private_stream_2 and
  
  other stream_id types.
  Signed-off-by : zheng qian <xqq@xqq.im>
  
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavformat/mpegtsenc.c