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• ffmpeg How to add multiple drawtext to one input video

  22 mai 2018, par Raven

  I need to add two texts to a video. First text appears in the bottom right for the first 6 seconds, and the second text at the center of the video for the last 3 seconds.

  Below is my code :

  ffmpeg -i input.mp4 -vf drawtext="text='Stack Overflow': fontcolor=white: borderw=2: fontfile=Arial Black: fontsize=w*0.04: x=(w-text_w)-(w*0.04): y=(h-text_h)-(w*0.04): enable='between(t,0,6)'", -vf drawtext="text='Stack Overflow': fontcolor=white: borderw=2: fontfile=Arial Black: fontsize=w*0.04: x=(w-text_w)/2: y=(h-text_h)/2: enable='between(t,7,10)'" -codec:a copy output2.mp4

  I don’t get any error running the above code but in the output file, only the second drawtext is applied.

• Extract RTP-packages from video

  5 août 2019, par Gregor A. Lamche

  I have a proprietary REST server that acts as a sort of RTSP server and establishes a UDP stream to another program for video streaming (no audio). It works fine and I can already stream videos. The only issue is that it can only stream one (proprietary) file (container) format at the moment as I’m limited by my media source code.

  I need a code/library which I can give any video file of a common video format/encoding (MPEG-4/MJPEG/H264) and it returns me the RTP-packages that I can then stream (or how to extract the content myself). Alternatively I already got a video player which gives me YUV frames of any video I give it, which in turn I could convert into RTP-packages provided I know how.

  Rendering is done on client side, and something I don’t care about. Though, I will have to set the encoding flags correctly.

  I know roughly about the RTP-header, but have no idea what bytes to write into its content. I heard of FFmpeg and Live555, but for neither could I find example code to extract those packages from a file (let alone a c# wrapper).

• ffmpeg resample to flac loud clicks/noise

  4 août 2017, par Sjoerd Staal

  I’m using the ffmpeg-api to resample a DSD file to Flac & mp3. I don’t experience any problems with the mp3 resample, but with the flac resample there is always a loud click at the end of a track.

  I’m using the FFMpeg API which outputs the following command in command line :

  ffmpeg -i input.dsf -ar 192000 -acodec flac output.flac

  Output :

  ffmpeg version 2.8.5 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with Apple LLVM version 7.0.2 (clang-700.1.81)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.8.5 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-vda
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  [mjpeg @ 0x7fe617809000] Changeing bps to 8
  
  [dsf @ 0x7fe617000000] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, dsf, from 'input.dsf':
  
    Metadata:
  
      title           : Bach Brandenburg no. 6 - Allegro
  
      artist          : Florilegium
  
      album           : Brandenburg Concertos
  
      track           : 3
  
      Tool Version    : 18.0.212
  
      genre           : Classical
  
      composer        : Bach
  
      Catalog #       : 35914
  
      Format          : DSD
  
      ISRC            : NLA460912792
  
      Label           : Channel Classics
  
      Tool Name       : Media Center
  
      date            : 2014
  
    Duration: 00:06:00.31, bitrate: 5644 kb/s
  
      Stream #0:0: Audio: dsd_lsbf_planar, 352800 Hz, stereo, fltp, 5644 kb/s
  
      Stream #0:1: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 1429x1417 [SAR 300:300 DAR 1429:1417], 90k tbr, 90k tbn, 90k tbc
  
      Metadata:
  
        title           : Picture
  
        comment         : Cover (front)
  
  [flac @ 0x7fe617122000] encoding as 24 bits-per-sample
  
  Output #0, flac, to 'output.flac':
  
    Metadata:
  
      title           : Bach Brandenburg no. 6 - Allegro
  
      artist          : Florilegium
  
      album           : Brandenburg Concertos
  
      TRACKNUMBER     : 3
  
      Tool Version    : 18.0.212
  
      genre           : Classical
  
      composer        : Bach
  
      Catalog #       : 35914
  
      Format          : DSD
  
      ISRC            : NLA460912792
  
      Label           : Channel Classics
  
      Tool Name       : Media Center
  
      date            : 2014
  
      encoder         : Lavf56.40.101
  
      Stream #0:0: Audio: flac, 192000 Hz, stereo, s32 (24 bit), 128 kb/s
  
      Metadata:
  
        encoder         : Lavc56.60.100 flac
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (dsd_lsbf_planar (native) -> flac (native))
  
  Press [q] to stop, [?] for help
  
  size=  306541kB time=00:05:58.10 bitrate=7012.3kbits/s    
  
  video:0kB audio:306532kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.002733%