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• ffmpeg Bmp to yuv : Crash at sws_scale

  28 décembre 2015, par the-owner

  The context :
  I have a succession of continuous bitmap and I want to encode them into a light video format.
  I use ffmpeg version 2.8.3 (the build here), under qt5, qt IDE, and msvc2013 for win32.

  The problem :
  My code crash at sws_scale () (and sometimes at avcodec_encode_video2()). When I explore the stack, the crash event occurs at sws_getCachedContext (). (I can only see the stack with these ffmpeg builds).
  I only use these ffmpeg libraries (from the Qt .pro file) :

  LIBS += -lavcodec -lavformat -lswscale -lavutil

  It’s swscale which bug. And this is the code :

  void newVideo ()
  
  {
  
      ULONG_PTR gdiplusToken;
  
      GdiplusStartupInput gdiplusStartupInput;
  
      GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
  
  
  
      initBitmap (); //init bmp
  
      int screenWidth =  bmp.bmiHeader.biWidth;
  
      int screenHeight = bmp.bmiHeader.biHeight;
  
  
  
      AVCodec * codec;
  
      AVCodecContext * c = NULL;
  
      uint8_t * outbuf;
  
      int i, out_size, outbuf_size;
  
  
  
  
  
      avcodec_register_all();
  
  
  
      qDebug () << "Video encoding\n";
  
  
  
      // Find the mpeg1 video encoder
  
      codec = avcodec_find_encoder(AV_CODEC_ID_H264);
  
      if (!codec)
  
      {
  
          qDebug () << "Codec not found\n";
  
          avcodec_close(c);
  
          av_free(c);
  
          return;
  
      }
  
      else
  
          qDebug () << "H264 codec found\n";
  
  
  
      c = avcodec_alloc_context3(codec);
  
  
  
      c->bit_rate = 1000000;
  
      c->width = 800; // resolution must be a multiple of two (1280x720),(1900x1080),(720x480)
  
      c->height = 600;
  
      c->time_base.num = 1; // framerate numerator
  
      c->time_base.den = 25; // framerate denominator
  
      c->gop_size = 30; // emit one intra frame every ten frames
  
      c->max_b_frames = 1; // maximum number of b-frames between non b-frames
  
      c->pix_fmt = AV_PIX_FMT_YUV420P; //Converstion RGB to YUV ?
  
      c->codec_id = AV_CODEC_ID_H264;
  
  
  
      struct SwsContext* fooContext = sws_getContext(screenWidth, screenHeight,
  
                                                     AV_PIX_FMT_RGB32,
  
                                                     c->width, c->height,
  
                                                     AV_PIX_FMT_YUV420P,
  
                                                     SWS_FAST_BILINEAR,
  
                                                     NULL, NULL, NULL);
  
  
  
      // Open the encoder
  
      if (avcodec_open2(c, codec, NULL) < 0)
  
      {
  
          qDebug () << "Could not open codec\n";
  
          avcodec_close(c);
  
          av_free(c);
  
          return;
  
      }
  
      else qDebug () << "H264 codec opened\n";
  
  
  
      outbuf_size = 100000 + c->width*c->height*(32>>3);//*(32>>3); // alloc image and output buffer
  
      outbuf = static_cast(malloc(outbuf_size));
  
      qDebug() << "Setting buffer size to: " << outbuf_size << "\n";
  
  
  
      FILE* f = fopen("TEST.mpg","wb");
  
      if(!f) qDebug() << "x - Cannot open video file for writing\n";
  
      else qDebug() << "Opened video file for writing\n";
  
  
  
      // encode 5 seconds of video
  
      for (i = 0; i < STREAM_FRAME_RATE*STREAM_DURATION; i++) //the stop condition i < 5.0*5
  
      {
  
          qDebug () << "i = " << i;
  
          fflush(stdout);
  
  
  
          HBITMAP hBmp;
  
          if (GetScreen(hBmp) == -1) return;
  
          BYTE * pPixels;// = new BYTE [bmp.bmiHeader.biSizeImage];
  
          pPixels = getPixels (hBmp);
  
          DeleteObject (hBmp);
  
  
  
          int nbytes = avpicture_get_size(AV_PIX_FMT_YUV420P, c->width, c->height);
  
          uint8_t* outbuffer = (uint8_t*)av_malloc(nbytes*sizeof(uint8_t));
  
          if(!outbuffer) // check if(outbuf) instead
  
          {
  
              qDebug () << "Bytes cannot be allocated";
  
              return;
  
          }
  
  
  
          AVFrame* inpic = avcodec_alloc_frame(); //av_frame_alloc () ?
  
          AVFrame* outpic = avcodec_alloc_frame();
  
  
  
          outpic->pts = (int64_t)((float)i * (1000.0/((float)(c->time_base.den))) * 90);
  
          if (avpicture_fill((AVPicture*) inpic, (uint8_t*) pPixels, AV_PIX_FMT_RGB32,
  
                         screenWidth, screenHeight) < 0)
  
              qDebug () <<  "avpicture_fill Fill picture with image failed"; //Fill picture with image
  
  
  
          if(avpicture_fill((AVPicture*) outpic, outbuffer, AV_PIX_FMT_YUV420P,
  
                         c->width, c->height) < 0)
  
              qDebug () <<  "avpicture_fill failed";
  
  
  
          if (av_image_alloc(outpic->data, outpic->linesize, c->width, c->height,
  
                         c->pix_fmt, 1) < 0)
  
              qDebug () <<  "av_image_alloc failed";
  
  
  
          inpic->data[0] += inpic->linesize[0]*(screenHeight - 1); // Flipping frame
  
          inpic->linesize[0] = -inpic->linesize[0]; // Flipping frame
  
  
  
  ////////////////////////////HERE THE BUG////////////////////////////////
  
          sws_scale(fooContext,
  
                    inpic->data, inpic->linesize,
  
                    0, c->height,
  
                    outpic->data, outpic->linesize); //HERE THE BUG
  
  
  
          av_free_packet((AVPacket *)outbuf);
  
          // encode the image
  
          out_size = avcodec_encode_video2 (c, (AVPacket *) outbuf,
  
                                            (AVFrame *) outbuf_size, (int *) outpic);
  
  ///////////////////////THE CODE DONT GO BEYOND/////////////////////////////////
  
  
  
          qDebug () << "Encoding frame" << i <<" (size=" << out_size <<"\n";
  
          fwrite(outbuf, 1, out_size, f);
  
          delete [] pPixels;
  
          av_free(outbuffer);
  
          av_free(inpic);
  
          av_freep(outpic);
  
      }
  
  
  
      // get the delayed frames
  
      for(; out_size; i++)
  
      {
  
          fflush(stdout);
  
          out_size = avcodec_encode_video2 (c, (AVPacket *) outbuf,
  
                                            (AVFrame *) outbuf_size, NULL);
  
          qDebug () << "Writing frame" << i <<" (size=" << out_size <<"\n";
  
          fwrite(outbuf, 1, out_size, f);
  
      }
  
  
  
      // add sequence end code to have a real mpeg file
  
      outbuf[0] = 0x00;
  
      outbuf[1] = 0x00;
  
      outbuf[2] = 0x01;
  
      outbuf[3] = 0xb7;
  
      fwrite(outbuf, 1, 4, f);
  
      fclose(f);
  
  
  
      avcodec_close(c);
  
      free(outbuf);
  
      av_free(c);
  
      qDebug () << "Closed codec and Freed\n";
  
  }

  And the output :

  Video encoding
  
  
  
  H264 codec found
  
  
  
  H264 codec opened
  
  
  
  Setting buffer size to:  2020000 
  
  
  
  Opened video file for writing
  
  
  
  i =  0
  
  **CRASH**

  I have thougth that my bitmap wasn’t good so I have crafted a bitmap just for testing, the code was :

      uint8_t* pPixels = new uint8_t[Width * 3 * Height];
  
      int x = 50;
  
      for(unsigned int i = 0; i < Width * 3 * Height; i = i + 3) // loop for generating color changing images
  
      {
  
          pPixels [i] = x % 255; //R
  
          pPixels [i + 1] = (x) % 255; //G
  
          pPixels [i + 2] = (255 - x) % 255; //B
  
      }

  However the crash continue. Perhaps, it might prove that it’s not the bitmap (pPixels) which has a problem.

  If anyone know, why I get this bug : Maybe don’t I set one parameter well ? Or one ffmpeg deprecated function ? etc.

  ---

  EDIT 1 27/12/15

  Thanks to Ronald S. Bultje The function sws_scale () does not crash with this code, however I get an error from it bad dst image pointers. My code :

  //DESTINATION FRAME            
  
  if (avpicture_alloc ((AVPicture*) dst_frame, AV_PIX_FMT_YUV420P, c->width, c->height) < 0)
  
              {
  
                  qDebug () <<  "# avpicture_alloc failed";
  
                  return;
  
              }
  
              if(avpicture_fill((AVPicture*) dst_frame, NULL, AV_PIX_FMT_YUV420P,
  
                             c->width, c->height) < 0)
  
                  qDebug () <<  "avpicture_fill failed";
  
              avcodec_align_dimensions2 (c, &c->width, &c->height, dst_frame->linesize);
  
  
  
  //SOURCE FRAME
  
              if (avpicture_fill((AVPicture*) src_frame, (uint8_t *) pPixels, AV_PIX_FMT_RGB32,
  
                                 tmp_screenWidth, tmp_screenHeight) < 0)
  
                  qDebug () <<  "# avpicture_fill Fill picture with image failed"; //Fill picture with image
  
              avcodec_align_dimensions2 (c, &tmp_screenWidth, &tmp_screenHeight, src_frame->linesize);
  
  
  
              struct SwsContext* conversionContext = sws_getContext(tmp_screenWidth,tmp_screenHeight,AV_PIX_FMT_RGB32,c->width, c->height, AV_PIX_FMT_YUV420P,SWS_FAST_BILINEAR, NULL, NULL, NULL);
  
  
  
              int output_Height = sws_scale(conversionContext,
  
                                            src_frame->data, src_frame->linesize,
  
                                            0, tmp_screenHeight,
  
                                            dst_frame->data, dst_frame->linesize); //return 0 -> bad dst image pointers error

  ---

  EDIT 2 28/12/15

  I have tried to follow the Ronald S. Bultje’s suggestion and now I get a bad src image pointers error, I have investigated and worked many hours but I do not find a solution. Here, there is the new snippet :

  AVFrame* src_frame = av_frame_alloc ();
  
  AVFrame* dst_frame = av_frame_alloc ();
  
  AVFrame* tmp_src_frame = av_frame_alloc ();
  
  
  
  /*........I do not use them until this snippet..........*/
  
  //DESTINATION
  
  //avpicture_free ((AVPicture*)dst_frame);
  
  avcodec_align_dimensions2 (c, &c->width, &c->height, dst_frame->linesize);
  
  if (avpicture_alloc ((AVPicture*) dst_frame, AV_PIX_FMT_YUV420P, c->width, c->height) < 0)
  
  {
  
      qDebug () <<  "# avpicture_alloc failed";
  
      return;
  
  }
  
  
  
  //SOURCE
  
  //stride = src_frame->linesize [0] = ((((screenWidth * bitPerPixel) + 31) & ~31) >> 3); do I need to do that ?
  
  //== stride - I have gotten this formula from : https://msdn.microsoft.com/en-us/library/windows/desktop/dd318229(v=vs.85).aspx
  
  if (avpicture_fill((AVPicture*) src_frame, (uint8_t *) pPixels, AV_PIX_FMT_RGB32,
  
                     screenWidth, screenHeight) < 0)
  
      qDebug () <<  "# avpicture_fill Fill picture with image failed"; //Fill picture with image
  
  //linesize [0] == 21760 like commented stride
  
  
  
  //Source TO TMP Source
  
  avcodec_align_dimensions2 (c, &tmp_screenWidth, &tmp_screenHeight, tmp_src_frame->linesize);
  
  if (avpicture_fill((AVPicture*) tmp_src_frame, NULL, AV_PIX_FMT_RGB32,
  
                     tmp_screenWidth, tmp_screenHeight) < 0)
  
      qDebug () <<  "# avpicture_fill Fill picture with image failed"; //Fill picture with image
  
  
  
  av_picture_copy ((AVPicture*) tmp_src_frame, (const AVPicture*) src_frame, AV_PIX_FMT_RGB32,
  
                   screenWidth, screenHeight);
  
  
  
  struct SwsContext* conversionContext = sws_getContext(tmp_screenWidth, tmp_screenHeight,
  
                                                        AV_PIX_FMT_RGB32,
  
                                                        c->width, c->height,
  
                                                        AV_PIX_FMT_YUV420P,
  
                                                        SWS_FAST_BILINEAR,
  
                                                        NULL, NULL, NULL);
  
  
  
  int output_Height = sws_scale(conversionContext,
  
                                tmp_src_frame->data, tmp_src_frame->linesize,
  
                                0, tmp_screenHeight,
  
                                dst_frame->data, dst_frame->linesize);
  
  //ffmpeg error = bad src image pointers
  
  // output_Height == 0

  EDIT 3

  For temp Picture I have done an avcode_align_dimension2() then a avpicture_alloc() for allocating memory and avpicture_fill() in order to fill the picture pointer. Below the updated code :

  //DESTINATION
  
  //avpicture_free ((AVPicture*)dst_frame);
  
  avcodec_align_dimensions2 (c, &c->width, &c->height, dst_frame->linesize);
  
  if (avpicture_alloc ((AVPicture*) dst_frame, AV_PIX_FMT_YUV420P, c->width, c->height) < 0)
  
  {
  
      qDebug () <<  "# avpicture_alloc failed";
  
      return;
  
  }
  
  
  
  //SOURCE
  
  //src_frame->linesize [0] = ((((screenWidth * bpp) + 31) & ~31) >> 3);
  
  //src_frame->linesize [0] = stride;
  
  if (avpicture_fill((AVPicture*) src_frame, (uint8_t *) pPixels, AV_PIX_FMT_RGB32,
  
                     screenWidth, screenHeight) < 0)
  
      qDebug () <<  "# avpicture_fill Fill picture with image failed"; //Fill picture with image
  
  
  
  //Source TO TMP Source
  
  avcodec_align_dimensions2 (c, &tmp_screenWidth, &tmp_screenHeight, tmp_src_frame->linesize);
  
  if (avpicture_alloc ((AVPicture*) tmp_src_frame, AV_PIX_FMT_RGB32, tmp_screenWidth, tmp_screenHeight) < 0)
  
  {
  
      qDebug () <<  "# avpicture_alloc failed";
  
      return;
  
  }
  
  int outbuf_size = tmp_screenWidth*tmp_screenHeight*4;// alloc image and output buffer
  
  outbuf = static_cast(malloc(outbuf_size));
  
  if (avpicture_fill((AVPicture*) tmp_src_frame, outbuf, AV_PIX_FMT_RGB32,
  
                     tmp_screenWidth, tmp_screenHeight) < 0)
  
      qDebug () <<  "# avpicture_fill Fill picture with image failed"; //Fill picture with image
  
  av_picture_copy ((AVPicture*) tmp_src_frame, (const AVPicture*) src_frame, AV_PIX_FMT_RGB32,
  
                   tmp_screenWidth, tmp_screenHeight);
  
  
  
  struct SwsContext* conversionContext = sws_getContext(tmp_screenWidth, tmp_screenHeight,
  
                                                        AV_PIX_FMT_RGB32,
  
                                                        c->width, c->height,
  
                                                        AV_PIX_FMT_YUV420P,
  
                                                        SWS_FAST_BILINEAR,
  
                                                        NULL, NULL, NULL);
  
  
  
  int output_Height = sws_scale(conversionContext,
  
                                tmp_src_frame->data, tmp_src_frame->linesize,
  
                                0, tmp_screenHeight,
  
                                dst_frame->data, dst_frame->linesize);

  The call stack is as follow : av_picture_copy() is called then av_image_copy() then _VEC_memcpy() then fastcopy_I() and crash ... The problem is not the dimensions (tmp_screenWidth/Height) ? (With av_picture_copy () could we copy a picture P1 with dim W1xH1 to a picture P2 with dimension W2xH2 ?)

  EDIT 4

  Crash at av_picture_copy() which call _aligned_malloc() then av_image_copy _VEC_memcpy() and fastcopy_I()

  //SOURCE
  
  if (avpicture_fill((AVPicture*) src_frame, (uint8_t *) pPixels, AV_PIX_FMT_RGB32,
  
                     screenWidth, screenHeight) < 0)
  
      qDebug () <<  "# avpicture_fill Fill picture with image failed"; //Fill picture with image
  
  
  
  //Source TO TMP Source
  
  avcodec_align_dimensions2 (c, &tmp_screenWidth, &tmp_screenHeight, tmp_src_frame->linesize);
  
  if (avpicture_alloc ((AVPicture*) tmp_src_frame, AV_PIX_FMT_RGB32, tmp_screenWidth, tmp_screenHeight) < 0)
  
  {
  
      qDebug () <<  "# avpicture_alloc failed";
  
      return;
  
  }
  
  av_picture_copy ((AVPicture*) tmp_src_frame, (const AVPicture*) src_frame, AV_PIX_FMT_RGB32,
  
                   tmp_screenWidth, tmp_screenHeight);

• video after ffmpeg command conversion is not playing on windows

  10 décembre 2015, par Hemant Kumar

  I am stuck at a very weird and complex problem, hoping if anyone know the solution :

  I am converting user uploaded video using ffmpeg command on server and it was working fine as well. Today I found that if a video is recorded by a webcam from windows, is playing well in linux as well as on windows where as if user is creating a video by webcam from linux, is playing only on linux (any browser). On window it’s screen either show loading icon or black screen while audio is working fine.

  I am using following codec :

  ['-strict', '-2', '-preset slow', '-maxrate 500k', '-bufsize 1000k', vfOption, '-threads 0', '-ab 64k', '-movflags faststart','-vf scale=-1:480', '-metadata:s:v:0 rotate=0', '-vcodec libx264']

  I work on linux and using html5 player on my website. I am converting video in mp4 format.

  Input :

  ffmpeg -i /<server path="path">/stream_FE2AF05B-E630-1F7B-390B-37325B31B362.flv -strict -2 -vcodec libx264 -preset slow -vb 500k -maxrate 500k -bufsize 1000k -vf 'scale=-1:480 ' -threads 0 -ab 64k -s 640x480 -movflags faststart -metadata:s:v:0 rotate=0 /<server path="path">/testing.mp4
  
  </server></server>

  Output :

  ffmpeg version 2.2.5 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Aug  1 2014 09:24:02 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libtheora --enable-libx264 --enable-libvpx --enable-libmp3lame
  
    libavutil      52. 66.100 / 52. 66.100
  
    libavcodec     55. 52.102 / 55. 52.102
  
    libavformat    55. 33.100 / 55. 33.100
  
    libavdevice    55. 10.100 / 55. 10.100
  
    libavfilter     4.  2.100 /  4.  2.100
  
    libswscale      2.  5.102 /  2.  5.102
  
    libswresample   0. 18.100 /  0. 18.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, flv, from '/<server path="path">/stream_FE2AF05B-E630-1F7B-390B-37325B31B362.flv':
  
    Metadata:
  
      canSeekToEnd    : true
  
    Duration: 00:00:04.04, start: 0.000000, bitrate: 636 kb/s
  
      Stream #0:0: Video: flv1, yuv420p, 640x480, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: nellymoser, 44100 Hz, mono, flt
  
  [libx264 @ 0x23c5340] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x23c5340] profile High, level 5.2
  
  [libx264 @ 0x23c5340] 264 - core 142 r2453 ea0ca51 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=umh subme=8 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=24 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=cbr mbtree=1 bitrate=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=500 vbv_bufsize=1000 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to '/<server path="path">/testing.mp4':
  
    Metadata:
  
      canSeekToEnd    : true
  
      encoder         : Lavf55.33.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 640x480, q=-1--1, 500 kb/s, 16k tbn, 1k tbc
  
      Metadata:
  
        rotate          : 0
  
      Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, mono, fltp, 64 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (flv -> libx264)
  
    Stream #0:1 -> #0:1 (nellymoser -> aac)
  
  Press [q] to stop, [?] for help
  
  [mp4 @ 0x23c0200] Starting second pass: moving the moov atom to the beginning of the file2 drop=0    
  
  frame= 4020 fps=706 q=-1.0 Lsize=     355kB time=00:00:04.08 bitrate= 712.0kbits/s dup=3931 drop=0    
  
  video:271kB audio:32kB subtitle:0 data:0 global headers:0kB muxing overhead 16.957901%
  
  [libx264 @ 0x23c5340] frame I:17    Avg QP:27.55  size:  7119
  
  [libx264 @ 0x23c5340] frame P:1013  Avg QP:25.37  size:    88
  
  [libx264 @ 0x23c5340] frame B:2990  Avg QP:27.32  size:    22
  
  [libx264 @ 0x23c5340] consecutive B-frames:  0.8%  0.0%  0.1% 99.1%
  
  [libx264 @ 0x23c5340] mb I  I16..4: 42.0% 55.1%  2.9%
  
  [libx264 @ 0x23c5340] mb P  I16..4:  0.3%  0.4%  0.0%  P16..4:  0.6%  0.1%  0.0%  0.0%  0.0%    skip:98.6%
  
  [libx264 @ 0x23c5340] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.2%  0.0%  0.0%  direct: 0.0%  skip:99.8%  L0:35.7% L1:64.3% BI: 0.0%
  
  [libx264 @ 0x23c5340] 8x8 transform intra:55.0% inter:84.5%
  
  [libx264 @ 0x23c5340] direct mvs  spatial:87.6% temporal:12.4%
  
  [libx264 @ 0x23c5340] coded y,uvDC,uvAC intra: 33.4% 51.9% 0.7% inter: 0.0% 0.1% 0.0%
  
  [libx264 @ 0x23c5340] i16 v,h,dc,p: 26% 54% 15%  5%
  
  [libx264 @ 0x23c5340] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 16% 53%  3%  1%  2%  2%  3%  3%
  
  [libx264 @ 0x23c5340] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 20% 13% 14%  5%  7%  7% 11%  8%
  
  [libx264 @ 0x23c5340] i8c dc,h,v,p: 43% 31% 23%  3%
  
  [libx264 @ 0x23c5340] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x23c5340] ref P L0: 80.9%  9.0%  6.9%  2.6%  0.7%
  
  [libx264 @ 0x23c5340] ref B L0: 89.4%  8.6%  1.8%  0.2%
  
  [libx264 @ 0x23c5340] ref B L1: 91.0%  9.0%
  
  [libx264 @ 0x23c5340] kb/s:551.72
  
  </server></server>

  ---

  Outout from file recorded on window :

  Input :

  ffmpeg -i /<server path="path">/stream_window.flv -strict -2 -vcodec libx264 -preset slow -vb 500k -maxrate 500k -bufsize 1000k -vf 'scale=-1:480 ' -threads 0 -ab 64k -s 640x480 -movflags faststart -metadata:s:v:0 rotate=0 /<server path="path">/testing_1.mp4
  
  </server></server>

  Output :

  ffmpeg version 2.2.5 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Aug  1 2014 09:24:02 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libtheora --enable-libx264 --enable-libvpx --enable-libmp3lame
  
    libavutil      52. 66.100 / 52. 66.100
  
    libavcodec     55. 52.102 / 55. 52.102
  
    libavformat    55. 33.100 / 55. 33.100
  
    libavdevice    55. 10.100 / 55. 10.100
  
    libavfilter     4.  2.100 /  4.  2.100
  
    libswscale      2.  5.102 /  2.  5.102
  
    libswresample   0. 18.100 /  0. 18.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, flv, from '/<server path="path">/stream_window.flv':
  
    Metadata:
  
      canSeekToEnd    : true
  
    Duration: 00:00:09.22, start: 0.000000, bitrate: 420 kb/s
  
      Stream #0:0: Video: flv1, yuv420p, 640x480, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: nellymoser, 44100 Hz, mono, flt
  
  [libx264 @ 0x1e09fc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x1e09fc0] profile High, level 5.2
  
  [libx264 @ 0x1e09fc0] 264 - core 142 r2453 ea0ca51 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=umh subme=8 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=24 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=cbr mbtree=1 bitrate=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=500 vbv_bufsize=1000 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to '/<server path="path">/testing_1.mp4':
  
    Metadata:
  
      canSeekToEnd    : true
  
      encoder         : Lavf55.33.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 640x480, q=-1--1, 500 kb/s, 16k tbn, 1k tbc
  
      Metadata:
  
        rotate          : 0
  
      Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, mono, fltp, 64 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (flv -> libx264)
  
    Stream #0:1 -> #0:1 (nellymoser -> aac)
  
  Press [q] to stop, [?] for help
  
  [mp4 @ 0x1e06220] Starting second pass: moving the moov atom to the beginning of the file7 drop=0    
  
  frame= 8936 fps=703 q=-1.0 Lsize=     771kB time=00:00:09.26 bitrate= 681.5kbits/s dup=8907 drop=0    
  
  video:585kB audio:73kB subtitle:0 data:0 global headers:0kB muxing overhead 17.106213%
  
  [libx264 @ 0x1e09fc0] frame I:40    Avg QP:29.54  size:  7449
  
  [libx264 @ 0x1e09fc0] frame P:2248  Avg QP:30.88  size:    69
  
  [libx264 @ 0x1e09fc0] frame B:6648  Avg QP:39.17  size:    22
  
  [libx264 @ 0x1e09fc0] consecutive B-frames:  0.8%  0.0%  0.1% 99.1%
  
  [libx264 @ 0x1e09fc0] mb I  I16..4: 36.8% 60.7%  2.5%
  
  [libx264 @ 0x1e09fc0] mb P  I16..4:  0.2%  0.3%  0.0%  P16..4:  0.4%  0.0%  0.0%  0.0%  0.0%    skip:98.9%
  
  [libx264 @ 0x1e09fc0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.2%  0.0%  0.0%  direct: 0.0%  skip:99.8%  L0:34.2% L1:65.8% BI: 0.0%
  
  [libx264 @ 0x1e09fc0] 8x8 transform intra:60.6% inter:87.6%
  
  [libx264 @ 0x1e09fc0] direct mvs  spatial:72.8% temporal:27.2%
  
  [libx264 @ 0x1e09fc0] coded y,uvDC,uvAC intra: 36.3% 62.8% 4.7% inter: 0.0% 0.0% 0.0%
  
  [libx264 @ 0x1e09fc0] i16 v,h,dc,p: 33% 46% 15%  7%
  
  [libx264 @ 0x1e09fc0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 19% 46%  3%  1%  1%  1%  2%  4%
  
  [libx264 @ 0x1e09fc0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 17% 14%  9%  4%  4%  5%  5%  7%
  
  [libx264 @ 0x1e09fc0] i8c dc,h,v,p: 42% 31% 23%  4%
  
  [libx264 @ 0x1e09fc0] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x1e09fc0] ref P L0: 82.6%  9.9%  5.2%  1.7%  0.5%
  
  [libx264 @ 0x1e09fc0] ref B L0: 87.1% 11.0%  1.4%  0.4%
  
  [libx264 @ 0x1e09fc0] ref B L1: 90.3%  9.7%
  
  [libx264 @ 0x1e09fc0] kb/s:536.03
  
  </server></server>

  ---

  Can anyone figure what could be the problem ?

  @LordNeckbeard : Please find the command and its output above. Thanks

• Issue when combining 2 video files [after matching the specs]

  6 décembre 2015, par Rune

  Basically I got a .mp4 and a .flv file which I want to concatenate (the .mp4 should be the intro).

  So after having asked a previous question regarding this I went ahead and converted the intro video to an .flv with matching specifications of the second video.

  First I got the specifications of the second (.flv) video using ffprobe. This was the output :

  {
  
      "streams": [
  
          {
  
              "index": 0,
  
              "codec_name": "h264",
  
              "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
  
              "profile": "High",
  
              "codec_type": "video",
  
              "codec_time_base": "1/50",
  
              "codec_tag_string": "[0][0][0][0]",
  
              "codec_tag": "0x0000",
  
              "width": 646,
  
              "height": 364,
  
              "coded_width": 656,
  
              "coded_height": 368,
  
              "has_b_frames": 2,
  
              "sample_aspect_ratio": "1:1",
  
              "display_aspect_ratio": "323:182",
  
              "pix_fmt": "yuv420p",
  
              "level": 30,
  
              "chroma_location": "left",
  
              "refs": 5,
  
              "is_avc": "true",
  
              "nal_length_size": "4",
  
              "r_frame_rate": "25/1",
  
              "avg_frame_rate": "25/1",
  
              "time_base": "1/1000",
  
              "start_pts": 80,
  
              "start_time": "0.080000",
  
              "bit_rate": "400000",
  
              "bits_per_raw_sample": "8",
  
              "disposition": {
  
                  "default": 0,
  
                  "dub": 0,
  
                  "original": 0,
  
                  "comment": 0,
  
                  "lyrics": 0,
  
                  "karaoke": 0,
  
                  "forced": 0,
  
                  "hearing_impaired": 0,
  
                  "visual_impaired": 0,
  
                  "clean_effects": 0,
  
                  "attached_pic": 0
  
              }
  
          },
  
          {
  
              "index": 1,
  
              "codec_name": "aac",
  
              "codec_long_name": "AAC (Advanced Audio Coding)",
  
              "profile": "LC",
  
              "codec_type": "audio",
  
              "codec_time_base": "1/44100",
  
              "codec_tag_string": "[0][0][0][0]",
  
              "codec_tag": "0x0000",
  
              "sample_fmt": "fltp",
  
              "sample_rate": "44100",
  
              "channels": 2,
  
              "channel_layout": "stereo",
  
              "bits_per_sample": 0,
  
              "r_frame_rate": "0/0",
  
              "avg_frame_rate": "0/0",
  
              "time_base": "1/1000",
  
              "start_pts": 241,
  
              "start_time": "0.241000",
  
              "bit_rate": "96000",
  
              "disposition": {
  
                  "default": 0,
  
                  "dub": 0,
  
                  "original": 0,
  
                  "comment": 0,
  
                  "lyrics": 0,
  
                  "karaoke": 0,
  
                  "forced": 0,
  
                  "hearing_impaired": 0,
  
                  "visual_impaired": 0,
  
                  "clean_effects": 0,
  
                  "attached_pic": 0
  
              }
  
          }
  
      ],
  
      "format": {
  
          "filename": "vid2.flv",
  
          "nb_streams": 2,
  
          "nb_programs": 0,
  
          "format_name": "flv",
  
          "format_long_name": "FLV (Flash Video)",
  
          "start_time": "0.080000",
  
          "duration": "371.920000",
  
          "size": "23876671",
  
          "bit_rate": "513587",
  
          "probe_score": 100,
  
          "tags": {
  
              "audiosize": "4476626",
  
              "canSeekToEnd": "true",
  
              "datasize": "23876671",
  
              "videosize": "19004263",
  
              "hasAudio": "true",
  
              "hasCuePoints": "false",
  
              "hasKeyframes": "true",
  
              "hasMetadata": "true",
  
              "hasVideo": "true",
  
              "lasttimestamp": "372",
  
              "metadatacreator": "flvtool++ (Facebook, Motion project, dweatherford)",
  
              "totalframes": "9298",
  
              "encoder": "Lavf56.36.100"
  
          }
  
      }
  
  }

  Here’s my command :

  -i prefix.mp4 -b:v 400k -b:a 96k -r 25 -ar 44100 -acodec aac -vf scale=646:364 -strict -2 prefix.flv.

  This produces the following output (as well as the video file) :

  ffmpeg version N-76137-gb0bb1dc Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 5.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55.  4.100 / 55.  4.100
  
    libavcodec     57.  7.100 / 57.  7.100
  
    libavformat    57.  8.102 / 57.  8.102
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 12.100 /  6. 12.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.100 /  2.  0.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'prefix.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.8.102
  
    Duration: 00:00:05.31, start: 0.000000, bitrate: 1589 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1205 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 384 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Output #0, flv, to 'prefix.flv':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.8.102
  
      Stream #0:0(und): Video: flv1 (flv) ([2][0][0][0] / 0x0002), yuv420p, 646x364 [SAR 2912:2907 DAR 16:9], q=2-31, 400 kb/s, 25 fps, 1k tbn, 25 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
        encoder         : Lavc57.7.100 flv
  
      Stream #0:1(und): Audio: aac ([10][0][0][0] / 0x000A), 44100 Hz, 5.1, fltp, 96 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
        encoder         : Lavc57.7.100 aac
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> flv1 (flv))
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  frame=   79 fps=0.0 q=10.7 size=     381kB time=00:00:03.43 bitrate= 908.7kbits/frame=  132 fps=0.0 q=10.1 Lsize=     548kB time=00:00:05.31 bitrate= 844.1kbits/s
  
  video:479kB audio:62kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.161623%
  
  [aac @ 0000021aa893eae0] Qavg: 177.292

  I then run the outputted video file and it runs just like the old one.

  I then concatenate the ouputted intro file with my main video file using the following command (tmp.txt contains the 2 files) :

  -f concat -i tmp.txt -c copy newvid.flv

  This produces the following output :

  ffmpeg version N-76137-gb0bb1dc Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 5.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55.  4.100 / 55.  4.100
  
    libavcodec     57.  7.100 / 57.  7.100
  
    libavformat    57.  8.102 / 57.  8.102
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 12.100 /  6. 12.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.100 /  2.  0.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, concat, from 'tmp.txt':
  
    Duration: N/A, start: 0.000000, bitrate: 496 kb/s
  
      Stream #0:0: Video: flv1, yuv420p, 646x364, 400 kb/s, 25 fps, 25 tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: aac (LC), 44100 Hz, 5.1, fltp, 96 kb/s
  
  [flv @ 00000257b5f0e180] Codec for stream 0 does not use global headers but container format requires global headers
  
  [flv @ 00000257b5f0e180] Codec for stream 1 does not use global headers but container format requires global headers
  
  Output #0, flv, to 'newvid.flv':
  
    Metadata:
  
      encoder         : Lavf57.8.102
  
      Stream #0:0: Video: flv1 ([2][0][0][0] / 0x0002), yuv420p, 646x364, q=2-31, 400 kb/s, 25 fps, 25 tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: aac ([10][0][0][0] / 0x000A), 44100 Hz, 5.1, 96 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [flv @ 00000257b56947e0] Packet mismatch 486539264 7424
  
  [flv @ 00000257b56947e0] Auto-inserting h264_mp4toannexb bitstream filter
  
  [flv @ 00000257b5f0e180] Non-monotonous DTS in output stream 0:0; previous: 5263, current: 5255; changing to 5263. This may result in incorrect timestamps in the output file.
  
  frame= 6359 fps=0.0 q=-1.0 size=   15906kB time=00:04:14.30 bitrate= 512.4kbits/frame= 9428 fps=0.0 q=-1.0 Lsize=   23835kB time=00:06:17.05 bitrate= 517.8kbits/s
  
  video:19016kB audio:4403kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.777447%

  When I try to run the final video (newvid.flv) it plays like this :

  It starts off playing the intro just fine.
  However, when the intro is finished the video freezes while the sound of the actual video continues for the entire duration of the video.

  Thus in conclusion what is lacking is the video of the second vid (the audio is fine).

  I’m new at using ffmpeg but I’ve tried my best to solve this, which is why I’m asking for your help.

  I’d certainly appreciate if someone could help me out.