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• How to correctly apply select filter after trim in ffpeg ? [closed]

  29 mai 2024, par lakhan dhingra

  I am using the following ffmpeg command to trim and select certain portions of the video.

  


  ffmpeg -v verbose -i test.mp4 -filter_complex \
"[0:v]trim=start=5:end=40,setpts=PTS-STARTPTS[v_trimmed]; \
 [v_trimmed]select='between(t,10,20)',setpts=N/FRAME_RATE/TB[v]; \
 [0:a]atrim=start=5:end=40,asetpts=PTS-STARTPTS[a_trimmed]; \
 [a_trimmed]aselect='between(t,10,20)',asetpts=N/SR/TB[a]" \
-map "[v]" -map "[a]" -y -r 30 output_video.mp4


  


  The above command errors out with the following trace

  


  [h264 @ 0x12570a0e0] Reinit context to 1280x720, pix_fmt: yuv420p
[graph 0 input from stream 0:0 @ 0x600001ff8000] w:1280 h:720 pixfmt:yuv420p tb:1/30000 fr:30000/1001 sar:1/1 csp:bt709 range:tv
[graph_0_in_0:1 @ 0x600001ff80b0] tb:1/44100 samplefmt:fltp samplerate:44100 chlayout:stereo
[Parsed_trim_0 @ 0x600001ffc420] TB:0.000033 FRAME_RATE:29.970030 SAMPLE_RATE:nan
[Parsed_select_2 @ 0x600001ffc580] TB:0.000033 FRAME_RATE:nan SAMPLE_RATE:nan
[Parsed_atrim_4 @ 0x600001ffc630] TB:0.000023 FRAME_RATE:nan SAMPLE_RATE:44100.000000
[Parsed_aselect_6 @ 0x600001ffc790] TB:0.000023 FRAME_RATE:nan SAMPLE_RATE:44100.000000
[graph 0 input from stream 0:0 @ 0x600001ff8000] video frame properties congruent with link at pts_time: 0
[vost#0:0/libx264 @ 0x125707800] *** dropping frame 0 at ts -9223372036854775808
    Last message repeated 298 times
[fc#0 @ 0x600001ae81b0] Input 1 no longer accepts new data
[aist#0:1/aac @ 0x1257100b0] [dec:aac @ 0x12570ea40] Decoder returned EOF, finishing
[aist#0:1/aac @ 0x1257100b0] [dec:aac @ 0x12570ea40] Terminating thread with return code 0 (success)
[aist#0:1/aac @ 0x1257100b0] All consumers of this stream are done
[fc#0 @ 0x600001ae81b0] Filtergraph returned EOF, finishing
[fc#0 @ 0x600001ae81b0] All consumers returned EOF
[vost#0:0/libx264 @ 0x125707800] *** dropping frame 0 at ts -9223372036854775808
[vost#0:0/libx264 @ 0x125707800] Encoder thread received EOF
[vost#0:0/libx264 @ 0x125707800] Could not open encoder before EOF
[vost#0:0/libx264 @ 0x125707800] Task finished with error code: -22 (Invalid argument)
[vost#0:0/libx264 @ 0x125707800] Terminating thread with return code -22 (Invalid argument)
[aost#0:1/aac @ 0x1257084b0] Encoder thread received EOF
[fc#0 @ 0x600001ae81b0] Terminating thread with return code 0 (success)
[vist#0:0/h264 @ 0x12570ecf0] [dec:h264 @ 0x1257094e0] Decoder returned EOF, finishing
[vist#0:0/h264 @ 0x12570ecf0] [dec:h264 @ 0x1257094e0] Terminating thread with return code 0 (success)
[vist#0:0/h264 @ 0x12570ecf0] All consumers of this stream are done
[in#0/mov,mp4,m4a,3gp,3g2,mj2 @ 0x6000014ec100] All consumers are done
[in#0/mov,mp4,m4a,3gp,3g2,mj2 @ 0x6000014ec100] Terminating thread with return code 0 (success)
[aost#0:1/aac @ 0x1257084b0] Terminating thread with return code 0 (success)
[out#0/mp4 @ 0x600001de8000] Nothing was written into output file, because at least one of its streams received no packets.
frame=    0 fps=0.0 q=0.0 Lsize=       0KiB time=N/A bitrate=N/A dup=0 drop=301 speed=N/A    
[aac @ 0x1257087b0] Qavg: 645.507
[AVIOContext @ 0x125708d60] Statistics: 0 bytes written, 0 seeks, 0 writeouts
[in#0/mov,mp4,m4a,3gp,3g2,mj2 @ 0x6000014ec100] Input file #0 (test.mp4):
[in#0/mov,mp4,m4a,3gp,3g2,mj2 @ 0x6000014ec100]   Input stream #0:0 (video): 1219 packets read (1479521 bytes); 1201 frames decoded; 0 decode errors; 
[in#0/mov,mp4,m4a,3gp,3g2,mj2 @ 0x6000014ec100]   Input stream #0:1 (audio): 1741 packets read (646974 bytes); 1732 frames decoded; 0 decode errors (1773568 samples); 
[in#0/mov,mp4,m4a,3gp,3g2,mj2 @ 0x6000014ec100]   Total: 2960 packets (2126495 bytes) demuxed
[AVIOContext @ 0x125705640] Statistics: 2699615 bytes read, 0 seeks
Conversion failed!



  


  If I remove the setpts step after the trim, the above command will work as expected. What is the problem with using trim and setpts, and then, passing the output to the select filter ?
Note : Using trim is important as per my current flow.

  


• Memory Leak in c++/cli application

  10 décembre 2013, par Ankush

  I am passing bitmap from my c# app to c++/cli dll that add it to video.
  The problem is program slowly leaking memory. I tried _CrtDumpMemoryLeaks() shows me leak of bitmap & another 40 byte leak but i am disposing bitmap.
  Can anyone see memory leak, Here is code..

  Flow :

  1) Capture screenshot by takescreenshot()

  2) pass it to c++/cli function

  3) dispose bitmap

  lines from my c# app

  Bitmap snap = takescreeshot();
  
  vencoder.AddBitmap(snap);
  
  snap.Dispose();
  
  vencoder.printleak();
  
  
  
  private static Bitmap takescreeshot()
  
      {
  
          System.Drawing.Bitmap bitmap = null;
  
          System.Drawing.Graphics graphics = null;
  
  
  
          bitmap = new Bitmap
  
          (
  
              System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width,
  
              System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height,
  
              System.Drawing.Imaging.PixelFormat.Format24bppRgb
  
          );
  
  
  
          graphics = System.Drawing.Graphics.FromImage(bitmap);
  
  
  
          graphics.CopyFromScreen(Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y, 0, 0, Screen.PrimaryScreen.Bounds.Size);
  
  
  
          //Write TimeSpamp
  
          Rectangle rect = new Rectangle(1166, 738, 200, 20);
  
          String datetime= System.String.Format("{0:dd:MM:yy  hh:mm:ss}",DateTime.Now);
  
          System.Drawing.Font sysfont = new System.Drawing.Font("Times New Roman", 14, FontStyle.Bold);
  
          graphics.DrawString(datetime, sysfont, Brushes.Red,rect);
  
          //
  
  
  
          Grayscale filter = new Grayscale(0.2125, 0.7154, 0.0721);
  
          Bitmap grayImage = filter.Apply(bitmap);
  
  
  
          //Dispose
  
          bitmap.Dispose();
  
          graphics.Dispose();
  
  
  
          return grayImage;
  
      }

  now in c++/cli dll

  bool VideoEncoder::AddBitmap(Bitmap^ bitmap)
  
      {
  
          BitmapData^ bitmapData = bitmap->LockBits( System::Drawing::Rectangle( 0, 0,bitmap->Width, bitmap->Height ),ImageLockMode::ReadOnly,PixelFormat::Format8bppIndexed);
  
          uint8_t* ptr = reinterpret_cast( static_cast( bitmapData->Scan0 ) );
  
          uint8_t* srcData[4] = { ptr, NULL, NULL, NULL };
  
          int srcLinesize[4] = { bitmapData->Stride, 0, 0, 0 };
  
  
  
          pCurrentPicture = CreateFFmpegPicture(pVideoStream->codec->pix_fmt, pVideoStream->codec->width, pVideoStream->codec->height);
  
  
  
          sws_scale(pImgConvertCtx, srcData, srcLinesize, 0, bitmap->Height, pCurrentPicture->data, pCurrentPicture->linesize );
  
  
  
          bitmap->UnlockBits( bitmapData );
  
  
  
          write_video_frame();
  
  
  
          bitmapData=nullptr;
  
          ptr=NULL;
  
  
  
          return true;
  
      }
  
  
  
  AVFrame * VideoEncoder::CreateFFmpegPicture(int pix_fmt, int nWidth, int nHeight)
  
      {
  
  
  
        AVFrame *picture     = NULL;
  
        uint8_t *picture_buf = NULL;
  
        int size;
  
  
  
        picture = avcodec_alloc_frame();
  
        if ( !picture)
  
        {
  
          printf("Cannot create frame\n");
  
          return NULL;
  
        }
  
  
  
        size = avpicture_get_size((AVPixelFormat)pix_fmt, nWidth, nHeight);
  
  
  
        picture_buf = (uint8_t *) av_malloc(size);
  
  
  
        if (!picture_buf) 
  
        {
  
          av_free(picture);
  
          printf("Cannot allocate buffer\n");
  
          return NULL;
  
        }
  
  
  
        avpicture_fill((AVPicture *)picture, picture_buf,
  
          (AVPixelFormat)pix_fmt, nWidth, nHeight);
  
  
  
        return picture;
  
      }
  
  
  
      void VideoEncoder::write_video_frame()
  
      {
  
          AVCodecContext* codecContext = pVideoStream->codec;
  
  
  
          int out_size, ret = 0;
  
  
  
          if ( pFormatContext->oformat->flags & AVFMT_RAWPICTURE )
  
          {
  
              printf( "raw picture must be written" );
  
          }
  
          else
  
          {
  
              out_size = avcodec_encode_video( codecContext, pVideoEncodeBuffer,nSizeVideoEncodeBuffer, pCurrentPicture );
  
  
  
              if ( out_size > 0 )
  
              {
  
                  AVPacket packet;
  
                  av_init_packet( &packet );
  
  
  
                  if ( codecContext->coded_frame->pts != AV_NOPTS_VALUE )
  
                  {
  
                      packet.pts = av_rescale_q( packet.pts, codecContext->time_base, pVideoStream->time_base );
  
                  }
  
  
  
                  if ( codecContext->coded_frame->pkt_dts != AV_NOPTS_VALUE )
  
                  {
  
                      packet.dts = av_rescale_q( packet.dts, codecContext->time_base, pVideoStream->time_base );
  
                  }
  
  
  
                  if ( codecContext->coded_frame->key_frame )
  
                  {
  
                      packet.flags |= AV_PKT_FLAG_KEY;
  
                  }
  
  
  
                  packet.stream_index = pVideoStream->index;
  
                  packet.data = pVideoEncodeBuffer;
  
                  packet.size = out_size;
  
  
  
                  ret = av_interleaved_write_frame( pFormatContext, &packet );
  
  
  
                  av_free_packet(&packet);
  
                  av_freep(pCurrentPicture);
  
              }
  
              else
  
              {
  
                  // image was buffered
  
              }
  
          }
  
  
  
          if ( ret != 0 )
  
          {
  
              throw gcnew Exception( "Error while writing video frame." );
  
          }
  
      }
  
  
  
  
  
      void VideoEncoder::printleak()
  
      {
  
          printf("No of leaks: %d",_CrtDumpMemoryLeaks());
  
          printf("\n");
  
      }

• FFmpeg make mpeg2 ts without discontinuity

  31 mai 2012, par user1427162

  I have many MOV files recorded with iPhone and I want to convert them to mpeg2 TS. I want to use them for live video streaming with HTTP Live Streaming protocol.

  I set my iPhone to continiously send MOV files to server. Every video clip is 5 seconds long. I want to make mpeg2 TS out of them and add their urls to m3u8 playlist.
  I managed to do all of that, but when I try to play the stream VLC player plays only first two files in playlist, and last file in playlist at that moment.
  I searched the internet and I think this has something to do with discontinuity.

  Is there any way to convert multiple MOV files into multiple mpeg2 TS segments without discontinuity ?

  Or maybe I'm doing something else wrong ?
  Here is my ffmpeg command :

  ffmpeg.exe -i input,MOV -f mpegts output.ts

  and here is my m3u8 list :

  #EXTM3U
  
  #EXT-X-PLAYLIST-TYPE:EVENT
  
  #EXT-X-TARGETDURATION:10
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXTINF:10,
  
  fileSequence0.ts
  
  #EXTINF:10,
  
  fileSequence1.ts
  
  #EXTINF:10,
  
  fileSequence2.ts

  Thanks in advance