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• ffmpeg and timecode from movie metadata

  17 décembre 2015, par T4ng10r

  I want to add to movie made by digital camcorder timecode. This timecodes are visible during playback in camera, some tool to extract and visualize EXIF metadata also display them.

  I made few attempts to configure ffmpeg, but only succeed in adding CURRENT PC time, not time from file.

  ffmpeg -y -i S1480002.MP4 -vf "drawtext=fontfile=arial.ttf :expansion=normal: text=%{metadata\\:creation_time}: \ x=(w-tw)/2: y=h-(2*lh): fontcolor=white@0.8" output.mp4

  I need to extract creation time from input file metadata. ffprobe display this time, but ffmpeg don’t.

• Audio encoding using avcodec_fill_audio_frame() and memory leaks

  7 mai 2014, par praks411

  As a part of encoding decoded audio packets, I’m using avcodec_fill_audio_frame(). I’m passing allocated AVFrame pointer to along with buffer containing the decoded samples and other parameters number of channels, sample format, buffer size. Though the encoding is working fine I’m not able to completely eliminate the memory leaks. I’ve taken care of most of things but still I’m not able detect the leakage.
  Below is the function which I’m using for encoding. Please suggest something.
  AudioSample contains decoded data and it is completely managed in different class(free in class destructor). I’m freeing the AVFrame in FFmpegEncoder destructor and AVPacket is freed every time using av_free_packet() with av_packet_destruct enabled. What more do I need to free ?

  void FfmpegEncoder::WriteAudioSample(AudioSample *audS) 
  
  { 
  
  
  
  
  
      int num_audio_frame = 0; 
  
      AVCodecContext *c = NULL; 
  
     // AVFrame *frame; 
  
      AVPacket pkt; 
  
  
  
      av_init_packet(&pkt); 
  
      pkt.destruct = av_destruct_packet; 
  
      pkt.data = NULL; 
  
      pkt.size = 0; 
  
      int ret = 0, got_packet = 0; 
  
      c = m_out_aud_strm->codec; 
  
       static int64_t aud_pts_in = -1; 
  
  
  
      if((audS != NULL) && (audS->GetSampleLength() > 0) ) 
  
      { 
  
          int byte_per_sample = av_get_bytes_per_sample(c->sample_fmt); 
  
  
  
          PRINT_VAL("Byte Per Sample ", byte_per_sample) 
  
          m_frame->nb_samples = (audS->GetSampleLength())/(c->channels*av_get_bytes_per_sample(c->sample_fmt)); 
  
          if(m_frame->nb_samples == c->frame_size) 
  
          {   
  
  
  
  #if 1 
  
          if(m_need_resample && (c->channels >= 2)) 
  
             { 
  
                 uint8_t * t_buff1 = new uint8_t[audS->GetSampleLength()]; 
  
                 if(t_buff1 != NULL) 
  
                  { 
  
                       for(int64_t i = 0; i< m_frame->nb_samples; i++) 
  
                      { 
  
                          memcpy(t_buff1 + i*byte_per_sample, (uint8_t*)((uint8_t*)audS->GetAudioSampleData() + i*byte_per_sample*c->channels), byte_per_sample); 
  
                          memcpy(t_buff1 + (audS->GetSampleLength())/2 + i*byte_per_sample, (uint8_t*)((uint8_t*)audS->GetAudioSampleData() + i*byte_per_sample*c->channels+ byte_per_sample), byte_per_sample); 
  
                      } 
  
                      audS->FillAudioSample(t_buff1, audS->GetSampleLength()); 
  
                      delete[] t_buff1; 
  
                  } 
  
              } 
  
  #endif 
  
              ret = avcodec_fill_audio_frame(m_frame, c->channels, c->sample_fmt, (uint8_t*)audS->GetAudioSampleData(),m_frame->nb_samples*byte_per_sample*c->channels, 0); 
  
              //ret = avcodec_fill_audio_frame(&frame, c->channels, c->sample_fmt, t_buff,frame.nb_samples*byte_per_sample*c->channels, 0); 
  
              if(ret != 0) 
  
              { 
  
                  PRINT_MSG("Avcodec Fill Audio Failed ") 
  
              } 
  
              else 
  
              { 
  
                  got_packet = 0; 
  
                  ret = avcodec_encode_audio2(c, &pkt, m_frame, &got_packet); 
  
                  if(ret < 0 || got_packet == 0) 
  
                  { 
  
                      PRINT_MSG("failed to encode audio ")     
  
                  } 
  
                  else 
  
                  { 
  
                      PRINT_MSG("Audio Packet Encoded "); 
  
                      aud_pts_in++; 
  
                      pkt.pts = aud_pts_in; 
  
                      pkt.dts = pkt.pts; 
  
                      pkt.stream_index = m_out_aud_strm->index; 
  
  
  
                      ret = av_interleaved_write_frame(oc, &pkt); 
  
                      if(ret != 0) 
  
                      { 
  
                          PRINT_MSG("Error Write Audio PKT ")     
  
                      } 
  
                      else 
  
                      { 
  
                          PRINT_MSG("Audio PKT Writen ")     
  
                      } 
  
                  } 
  
               } 
  
          } 
  
          avcodec_flush_buffers(c); 
  
       //   avcodec_free_frame(&frame); 
  
       } 
  
  
  
       av_free_packet(&pkt); 
  
  } 

  Thanks,
  Pradeep

• tools/trasher : Check fseek returns

  22 février 2015, par Michael Niedermayer

  tools/trasher : Check fseek returns
  Fixes CID733726
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] tools/trasher.c