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• ffmpeg only drawing last text

  24 juillet 2020, par Muhammad Mohsin Ajmal

  Im using ffmpeg in flutter using the flutter ffmpeg plugin. While experimenting with it this is what I am trying to do : Show text between 1 to 2 seconds and a different text between 3 to 4 seconds in video.

  


  Only the text mentioned between 3 to 4 seconds is shown. So for me only the last drawText would work. What am I missing here ?

  


  The is the list of arguments generated

  


   Running FFmpeg with arguments: [-y, -i, /storage/emulated/0/DCIM/Camera/20200707_234610.mp4, -i, /data/user/0/com.example.example/app_flutter/watermark.png, -filter_complex, [0:v][1:v]overlay=main_w-overlay_w-5:5 ,drawtext=fontfile='/data/user/0/com.example.example/app_flutter/font.ttf':fontsize=90:x=20:y=20:text='Testing':enable='between(t\,1\,2),drawtext=fontfile='/data/user/0/com.example.example/app_flutter/font.ttf':fontsize=90:x=20:y=260:text='OTHER TEXT':enable='between(t\,3\,4)'', -crf, 27, -preset, veryfast, -c:v, libx264, -r, 30, /data/user/0/com.example.example/cache/2020-07-21T07:50:39.206386.mp4]



  


• Decoding an elementary HEVC stream using ffmpeg

  22 novembre 2013, par Zax

  I have successfully compiled and installed FFMPEG_2.1 from source code. I know that ffmpeg from version 2.1 onwards supports HEVC decoder. I have generated a .bin file using HM 10.0 and HM 11.0 HEVC reference code.

  However, when i give this bin file as an input to the ffmpeg i get an Input/output Error.

  The command that i have used is given below :

  ffmpeg -i Johnny_1280x720_60qp22.bin out.yuv

  The output of the above command is as shown below :

  ffmpeg version 2.1 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Nov 21 2013 15:52:14 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: 
  
    libavutil      52. 48.100 / 52. 48.100
  
    libavcodec     55. 39.100 / 55. 39.100
  
    libavformat    55. 19.104 / 55. 19.104
  
    libavdevice    55.  5.100 / 55.  5.100
  
    libavfilter     3. 90.100 /  3. 90.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
  Input #0, bin, from 'Johnny_1280x720_60qp22.bin':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: bintext, pal8, 1280x118288, 25 tbr, 25 tbn, 25 tbc
  
  Output #0, rawvideo, to 'out.yuv':
  
    Metadata:
  
      encoder         : Lavf55.19.104
  
      Stream #0:0: Video: rawvideo, pal8, 1280x118288, q=2-31, 200 kb/s, 90k tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (bintext -> rawvideo)
  
  Press [q] to stop, [?] for help
  
  Johnny_1280x720_60qp22.bin: Input/output error
  
  frame=    1 fps=0.3 q=0.0 size=  147861kB time=00:00:00.04 bitrate=30281932.8kbiframe=    1 fps=0.3 q=0.0 Lsize=  147861kB time=00:00:00.04 bitrate=30281932.8kbits/s    
  
  video:147861kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.000000

  Can anyone please tell me why i'm facing this problem and how i can rectify it.

• ffmpeg minimal requirements configuration for encoding and decoding h264 files

  14 novembre 2013, par TheSquad

  I'm trying to compile ffmpeg with minimal requirements in order to encode/decode with h264.

  So far my command line configuration is :

  ./configure --disable-yasm --disable-everything --enable-encoder=libx264 --enable-encoder=libfaac --enable-decoder=h264 --enable-muxer=h264 --enable-demuxer=h264 --enable-parser=h264 --enable-protocol=file

  once compiled, I try this :

  ./ffmpeg -i ~/Dropbox/TestFile.mov -vcodec libx264 test.mp4

  but I get an error :

    ffmpeg version N-58081-g2925571 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Nov 14 2013 15:49:58 with Apple LLVM version 5.0 (clang-500.2.76) (based on LLVM 3.3svn)
  
    configuration: --disable-yasm --disable-everything --enable-encoder=libx264 --enable-encoder=libfaac --enable-decoder=h264 --enable-muxer=h264 --enable-demuxer=h264 --enable-parser=h264 --enable-protocol=file
  
    libavutil      52. 52.100 / 52. 52.100
  
    libavcodec     55. 43.100 / 55. 43.100
  
    libavformat    55. 21.100 / 55. 21.100
  
    libavdevice    55.  5.100 / 55.  5.100
  
    libavfilter     3. 91.100 /  3. 91.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/mGs/Dropbox/TestFile.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      creation_time   : 2013-06-23 14:33:09
  
      model           : iPhone 4S
  
      model-fra       : iPhone 4S
  
      encoder         : 6.0
  
      encoder-fra     : 6.0
  
      date            : 2013-06-23T16:33:09+0200
  
      date-fra        : 2013-06-23T16:33:09+0200
  
      make            : Apple
  
      make-fra        : Apple
  
    Duration: 00:00:42.09, start: 0.000000, bitrate: 20960 kb/s
  
      Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 20880 kb/s, 29.97 fps, 29.97 tbr, 600 tbn, 1200 tbc (default)
  
      Metadata:
  
        rotate          : 180
  
        creation_time   : 2013-06-23 14:33:09
  
        handler_name    : Core Media Data Handler
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, 63 kb/s (default)
  
      Metadata:
  
        creation_time   : 2013-06-23 14:33:09
  
        handler_name    : Core Media Data Handler
  
  [NULL @ 0x7fd999802e00] Unable to find a suitable output format for 'test.mp4'
  
  test.mp4: Invalid argument

  This is probably coming from the fact that I have forgot something to enable on the ffmpeg configuration... But I can't found out what.

  The test file is a video got from iPhone 4S Camera.