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• how to compile FFMPEG and merge it to one android ".so" file

  5 avril 2016, par user965347

  i am intereseted to compile the ffmpeg source to android to be invoked with jni as one ".so" last time i tried 0.8 versions but failed it always shows that something is undeclared, i tried all of google examples but it seems doesnt work for me,
  i tried this one

  Link One

  but it seems that the ffmpeg.c is not included with compile , but when i compile it always error, it says that something undeclared, and i cant build this project as one android ".so" file

  i also tried this one,
  Link Two

  but it seems i cant understand.

  i have tried everything , but none of them work ,none of them merge all ".o" , ".so" , ".a" into one ".so" files

  is there any good example in google or somewhere to compile ffmpeg as one ".so" file and have a good downloadable source i can compile ?

• Cropping video with FFmpeg increases the tbn value too much

  5 avril 2016, par TOP

  Here is the information of original video :

   Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2016-04-05 03:00:09
  
    Duration: 00:01:50.09, start: 0.000000, bitrate: 8131 kb/s
  
      Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, bt470bg/bt470bg/smpte170m), 1920x1080, 7995 kb/s, SAR 1:1 DAR 16:9, 44.49 fps, 90k tbr, 90k tbn, 180k tbc (default)

  Then I used this ffmpeg command to crop video :

  ffmpeg -i file.mp4 -vf "crop=480:480:0:0" -b:v 2048k -preset ultrafast cropped.mp4

  Here is the information of cropped video :

   Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.28.101
  
    Duration: 00:01:50.16, start: 0.023220, bitrate: 1078 kb/s
  
      Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1282x716 [SAR 1:1 DAR 641:358], 1002 kb/s, 44.49 fps, 44.49 tbr, 220455000.00 tbn, 88.98 tbc (default)

  The default video player of my phone cannot play this video. If I use MX Player I have to change the decoder to Software decoder (instead of Hardware) to open it.

  I noticed that the tbn value was increased after reencoding. The old value is 90k. The new value is 220455k. Maybe it is the reason why the default video player doesn’t work.

  Question : why is the tbn value so big ? How to avoid it ?

• why is this intel hardware accellerated transcoding in ffmpeg not working ?

  1er avril 2016, par Jabb

  I compiled ffmpeg with intel hardware accelleration, but I cannot transcode the simpsons 720p video from http://www.h264info.com/clips.html with success.

  this is the error I get :

  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  and this is the full output from ffmpeg. What could be wrong ?

  root@ubuntu:/tmp# ffmpeg -i test.mp4 -vcodec h264_qsv out1.yuv
  
  ffmpeg version N-79177-ga677121 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.1)
  
    configuration: --prefix=/root/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-libmfx
  
    libavutil      55. 19.100 / 55. 19.100
  
    libavcodec     57. 32.100 / 57. 32.100
  
    libavformat    57. 29.101 / 57. 29.101
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 40.102 /  6. 40.102
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 1
  
      compatible_brands: isomavc1
  
      creation_time   : 2007-02-19 05:03:04
  
    Duration: 00:02:17.30, start: 0.000000, bitrate: 4283 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x544, 4221 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
  
      Metadata:
  
        creation_time   : 2007-02-19 05:03:04
  
        handler_name    : GPAC ISO Video Handler
  
      Stream #0:1(und): Audio: aac (HE-AAC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 64 kb/s (default)
  
      Metadata:
  
        creation_time   : 2007-02-19 05:03:08
  
        handler_name    : GPAC ISO Audio Handler
  
  [h264_qsv @ 0x2f626a0] Error initializing an internal MFX session
  
  Output #0, rawvideo, to 'out1.yuv':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 1
  
      compatible_brands: isomavc1
  
      Stream #0:0(und): Video: h264, none, q=2-31, 128 kb/s, 23.98 fps (default)
  
      Metadata:
  
        creation_time   : 2007-02-19 05:03:04
  
        handler_name    : GPAC ISO Video Handler
  
        encoder         : Lavc57.32.100 h264_qsv
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (h264_qsv))
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height