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• FFMPEG Combine multiple commands into one script

  16 février 2017, par ObeeWnn

  I need some help combining ffmpeg commands into a python or bash script :

  \Download
  
  Youtube-dl URL
  
  
  
  \Concatenate videos
  
  
  
  WD = "C:\"
  
  import glob
  
  files = glob.glob ('*.mp4')
  
  with open ('output.txt', 'w') as in_files:
  
      for eachfile in files: in_files.write('file \''+eachfile+'\'\n')
  
  
  
  ffmpeg -y -f concat -i output.txt -c copy input.mp4
  
  
  
  \Encode
  
  ffmpeg -y -threads 16 -i input.mp4 -c:a libfdk_aac -vbr 4 -c:v libx264 intermediate1.ts
  
  ffmpeg -y -threads 16 -i endscreen720.mp4 -c:a libfdk_aac -vbr 4 -c:v libx264 intermediate2.ts
  
  ffmpeg -y -i "concat:intermediate1.ts|intermediate2.ts" -c copy -bsf:a aac_adtstoasc tmp.mp4
  
  ffmpeg -y -i tmp.mp4 -itsoffset 00:00:20 -i lt1sub.avi -filter_complex overlay tmp1.mp4
  
  ffmpeg -y -i tmp1.mp4 -i intro.avi -filter_complex overlay tmp1a.mp4
  
  ffmpeg -y -i tmp1a.mp4 -i watermarkfile720.png -filter_complex "[0:v]drawtext=enable='between(n,30,116)' : 'fontfile=/Windows/Fonts/arial.ttf':text='TEXTGOESHERE':fontcolor=white:fontsize=50:x=150:y=(300)+th[text]; [text][1:v]overlay[filtered]" -map "[filtered]" -map 0:a -codec:v libx264 -codec:a copy tmp2.mp4
  
  ffmpeg -y -i tmp2.mp4 -r 60 -vf scale=1920:1080 output.mp4
  
  
  
  
  
  \Create Thumbnail
  
  ffmpeg -y -i tmp1.mp4 -vf drawtext="fontfile=/Windows/Fonts/arial.ttf': text='':fontcolor=white@1.0:fontsize=120:y=0:x=100" -ss 00:00:12 -vframes 1 out.png
  
  
  
  set /p input= Video #
  
  
  
  ffmpeg -y -i out.png  -i tnOverlay.png -filter_complex overlay,drawtext="fontfile=/Windows/Fonts/arial.ttf': text="%input%":fontcolor=white@1.0:fontsize=120:y=25:x=1190" out.png

  This is to download videos, place an intro video in the beginning, draw text over intro, concatenate the videos, apply watermark throughout video, apply outro, create thumbnail, etc.
  My FFmpeg compile :

  ffmpeg version N-83522-g6a37abc59a Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 6.3.0 (Rev1, Built by MSYS2 project)
  
    configuration:  --enable-avisynth --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-cuda --enable-cuvid --enable-schannel --enable-sdl2 --enable-decklink --enable-fontconfig --enable-frei0r --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libilbc --enable-libmfx --enable-libmodplug --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libwavpack --enable-libwebp --enable-libxavs --enable-libxvid --enable-libzimg --enable-openssl --enable-libsnappy --enable-gpl --enable-opencl --enable-opengl --enable-libcdio --enable-libfdk-aac --enable-libkvazaar --enable-librubberband --enable-libssh --enable-libtesseract --enable-libzvbi --enable-chromaprint --enable-libopenh264 --enable-libopenmpt --enable-netcdf --disable-w32threads --enable-version3 --enable-nonfree --enable-filter=frei0r --disable-debug
  
    libavutil      55. 47.100 / 55. 47.100
  
    libavcodec     57. 80.100 / 57. 80.100
  
    libavformat    57. 66.102 / 57. 66.102
  
    libavdevice    57.  2.100 / 57.  2.100
  
    libavfilter     6. 73.100 /  6. 73.100
  
    libswscale      4.  3.101 /  4.  3.101
  
    libswresample   2.  4.100 /  2.  4.100
  
    libpostproc    54.  2.100 / 54.  2.100

  Would like to use libfdk-aac and x264, or highest quality possible. The video source will be at 720p60fps and will be rendered to 1080p60fps.

• ffmpeg c# Windows forms

  7 février 2017, par TODO

  I’m fairly new to windows forms and ffmpeg (unity background).

  I’m trying to get a button click on a windows form to take a png sequence, and convert it to an mp4 with ffmpeg.

          Process ffmpeg = new Process();
  
  
  
          ffmpeg.StartInfo.FileName = Path.Combine(Environment.CurrentDirectory, @"c:\test\ffmpeg.exe");
  
  
  
          ffmpeg.StartInfo.Arguments = "-framerate 25 -i 0001_IMG%03d.JPG -c:v libx264 -preset ultrafast -crf 0 -vf scale=-2:1080 -pix_fmt yuv420p temp.mp4";
  
  
  
          ffmpeg.Start();

  I have no problem running the same ffmpeg command from cmd, or from within a c++ console application I experimented with Using system("")

  I’ve been stuck on this for a little longer than I care to admit, and have tried searching for answers, but am still learning as i go.

  Any help would be much appreciated.

• Can't replicate FFMpeg Prores quality setting

  3 février 2017, par Ben L

  Using ffmpeg as a library. I’m looking to create a global-quality slider with very inconsistent results. AvCodecContext::global_quality seems like a good place to start. Not all lossy codecs make reference to this member, but it does appear to work for ProRes.

  c:\>ffmpeg.exe -i test.mov -c:v prores_ks -q:v 28 out.mov     # output 10mb file
  
  
  
  c:\>ffmpeg.exe -i test.mov -c:v prores_ks -q:v 2 out.mov     # output 28mb file

  Great. Now let’s do it in code. Based on Muxing.c. I’m distilling down the code a lot just to give a hint about which api’s I’m calling.

  AVStream* AddStream(AVFormatContext* formatContext, int quality)
  
  {
  
      AVCodec* codec = AVFindEncoder("prores_ks");
  
  
  
      AVStream* newStream = avformat_new_stream(formatContext, codec);
  
  
  
      newStream->id = formatContext->nb_streams - 1;
  
  
  
      AVCodecContext c = avcodec_alloc_context3(codec);
  
  
  
      c->codec_id = AV_CODEC_ID_PRORES;
  
      c->codec_type = AVMEDIA_TYPE_VIDEO;
  
      c->width = 1920;
  
      c->height = 1080;
  
  
  
      newStream->time_base = av_inv_q(frameRate);
  
      c->time_base = av_inv_q(frameRate);
  
  
  
      c->pix_fmt = AV_PIX_FMT_YUVA444P10;
  
  
  
      c->global_quality = quality;
  
  
  
      return newStream;
  
  }
  
  ......
  
  //excerpt from WriteFrame()
  
  
  
  AVPacket pkt;
  
  av_init_packet(&pkt);
  
  pkt.data= pVideoBuffer;
  
  pkt.size= iVideoBufferSize;
  
  int gotpkt = 0;
  
  int ret = avcodec_encode_video2(pCodecContext, &pkt, pPicture, &gotpkt);
  
  if (ret == 0)
  
  {
  
      av_packet_rescale_ts(&pkt, pCodecContext->time_base, pVideoStream->time_base);
  
  
  
      if (gotpkt) {
  
          ret = av_interleaved_write_frame(pFormatContext, &pkt);
  
      }
  
  }

  I can’t get quality to affect the size of the output. Any ideas ?

  This is the excerpt from proresenc_kostya.c

  ctx->force_quant = avctx->global_quality / FF_QP2LAMBDA;
  
  if (!ctx->force_quant) {
  
      if (!ctx->bits_per_mb) {
  
          for (i = 0; i < NUM_MB_LIMITS - 1; i++)
  
              if (prores_mb_limits[i] >= ctx->mb_width * ctx->mb_height *
  
                                         ctx->pictures_per_frame)
  
                  break;
  
          ctx->bits_per_mb   = ctx->profile_info->br_tab[i];
  
      } else if (ctx->bits_per_mb < 128) {
  
          av_log(avctx, AV_LOG_ERROR, "too few bits per MB, please set at least 128\n");
  
          return AVERROR_INVALIDDATA;
  
      }
  
  
  
      min_quant = ctx->profile_info->min_quant;
  
      max_quant = ctx->profile_info->max_quant;
  
      for (i = min_quant; i < MAX_STORED_Q; i++) {
  
          for (j = 0; j < 64; j++)
  
              ctx->quants[i][j] = ctx->quant_mat[j] * i;
  
      }
  
  
  
      ctx->slice_q = av_malloc(ctx->slices_per_picture * sizeof(*ctx->slice_q));
  
      if (!ctx->slice_q) {
  
          encode_close(avctx);
  
          return AVERROR(ENOMEM);
  
      }
  
  
  
      ctx->tdata = av_mallocz(avctx->thread_count * sizeof(*ctx->tdata));
  
      if (!ctx->tdata) {
  
          encode_close(avctx);
  
          return AVERROR(ENOMEM);
  
      }
  
  
  
      for (j = 0; j < avctx->thread_count; j++) {
  
          ctx->tdata[j].nodes = av_malloc((ctx->slices_width + 1)
  
                                          * TRELLIS_WIDTH
  
                                          * sizeof(*ctx->tdata->nodes));
  
          if (!ctx->tdata[j].nodes) {
  
              encode_close(avctx);
  
              return AVERROR(ENOMEM);
  
          }
  
          for (i = min_quant; i < max_quant + 2; i++) {
  
              ctx->tdata[j].nodes[i].prev_node = -1;
  
              ctx->tdata[j].nodes[i].bits      = 0;
  
              ctx->tdata[j].nodes[i].score     = 0;
  
          }
  
      }
  
  } 

  Edit :

  Outputs from ffmpeg.exe :

  profile 4, 1020 slices, interlacing: no, 6576 bits per MB
  
  frame size upper bound: 11429274

  Output from ffmpeg avlog on my app :

  profile 4, 1020 slices, interlacing: no, 1425 bits per MB
  
  frame size upper bound: 6170103