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• How to blend/merge two videos in android programmatically

  25 octobre 2015, par endryha

  As description says I am trying to create a video which consists of background video and semi-transparent video overlay on top of it.

  My initial attempt was to use ffmpeg for android https://github.com/WritingMinds/ffmpeg-android-java and use blend filter in overlay mode.

  But it turned out that ffmpeg android library is built on top of ffmpeg 2.4 but blend filter is available since ffmpeg 2.6. So far ffmpeg failed for me and I am looking for alternative solution.

  Any advices are warmly appreciated.

  UPDATE#1

  I finally managed to build ffmpeg 2.6.4 for android which contains blend filter but another issue appeared. When it start video processing it just stops in the beginning and never ends, there is not output from ffmpeg tool, no errors, no warnings, there is nothing that can help me to trace down the problem.

  On android device it runs following command :

  /data/user/0/com.test.app/files/ffmpeg 
  
  -i /storage/emulated/0/Android/data/com.test.app/files/video/vid1.mp4 
  
  -i /storage/emulated/0/Android/data/com.test.app/files/video/overlay.mp4 
  
  -filter_complex blend=all_mode='overlay':all_opacity=0.8" 
  
  -strict -2 /storage/emulated/0/Android/data/com.test.app/files/video/blended.mp4

  And there is following output :

  ffmpeg version n2.6.4 Copyright (c) 2000-2015 the FFmpeg developers
  
     built with gcc 4.8 (GCC)
  
     configuration: --target-os=linux --cross-prefix=/media/ubuntu/data/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/media/ubuntu/data/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/media/ubuntu/data/ffmpeg-android/ffmpeg-pkg-config --prefix=/media/ubuntu/data/ffmpeg-android/build/armeabi-v7a-neon --extra-cflags='-I/media/ubuntu/data/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -mfpu=neon' --extra-ldflags='-L/media/ubuntu/data/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
     libavutil      54. 20.100 / 54. 20.100
  
     libavcodec     56. 26.100 / 56. 26.100
  
     libavformat    56. 25.101 / 56. 25.101
  
     libavdevice    56.  4.100 / 56.  4.100
  
     libavfilter     5. 11.102 /  5. 11.102
  
     libswscale      3.  1.101 /  3.  1.101
  
     libswresample   1.  1.100 /  1.  1.100
  
     libpostproc    53.  3.100 / 53.  3.100
  
   [h264 @ 0xb5e03000] no frame!
  
   [aac @ 0xb5e03400] Input buffer exhausted before END element found
  
   Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Android/data/com.test.app/files/video/vid1.mp4':
  
     Metadata:
  
       major_brand     : mp42
  
       minor_version   : 0
  
       compatible_brands: isommp42
  
       creation_time   : 2015-08-30 17:19:07
  
     Duration: 00:00:05.03, start: 0.000000, bitrate: 3449 kb/s
  
       Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 640x640, 3381 kb/s, SAR 1:1 DAR 1:1, 30 fps, 30 tbr, 90k tbn, 180k tbc (default)
  
       Metadata:
  
         creation_time   : 2015-08-30 17:19:07
  
         handler_name    : VideoHandle
  
       Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 63 kb/s (default)
  
       Metadata:
  
         creation_time   : 2015-08-30 17:19:07
  
         handler_name    : SoundHandle
  
   [h264 @ 0xb5e03800] no frame!
  
   [aac @ 0xb5e04400] Input buffer exhausted before END element found
  
   Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Android/data/com.test.app/files/video/overlay.mp4':
  
     Metadata:
  
       major_brand     : mp42
  
       minor_version   : 0
  
       compatible_brands: isommp42
  
       creation_time   : 2015-08-30 17:19:07
  
     Duration: 00:00:05.03, start: 0.000000, bitrate: 3449 kb/s
  
       Stream #1:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 640x640, 3381 kb/s, SAR 1:1 DAR 1:1, 30 fps, 30 tbr, 90k tbn, 180k tbc (default)
  
       Metadata:
  
         creation_time   : 2015-08-30 17:19:07
  
         handler_name    : VideoHandle
  
       Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 63 kb/s (default)
  
       Metadata:
  
         creation_time   : 2015-08-30 17:19:07
  
         handler_name    : SoundHandle

  After this output ffmpeg process is still running but it doesn’t provide any response... I am not sure how to deal with such issue, maybe I can try to use different codecs which works better on android or enable some debugging logging in ffmpeg.
  Any advices would help.

  UPDATE#2

  Thank you

• FFMPEG conversion creates a smaller files despite unchanged codecs

  26 octobre 2015, par Idan

  I have a h264/aac video mp4 file that FFMPEG says this about :

    Metadata:
  
      major_brand     : qt
  
      minor_version   : 0
  
      compatible_brands: qt
  
      creation_time   : 2015-10-15 16:41:52
  
    Duration: 00:03:36.20, start: 0.000000, bitrate: 4298 kb/s
  
      Stream #0:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (default)
  
      Metadata:
  
        creation_time   : 2015-10-15 16:41:53
  
        handler_name    : Core Media Data Handler
  
      Stream #0:1(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720, 4160 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 2015-10-15 16:41:53
  
        handler_name    : Core Media Data Handler
  
        encoder         : H.264

  Then, I run a conversion on it while keeping it the same codecs and resolution with this command line :

  ffmpeg -i x.mp4 -vcodec h264 -acodec libvo_aacenc y.mp4

  The resulting output file info is :

    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.36.100
  
    Duration: 00:03:36.29, start: 0.033333, bitrate: 1913 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 1780 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler

  It seems that the input and output file should be identical but the input file is 116MB and the resulting output file is 51.7MB.

  If the codecs and resolution are the same and there is not change in the video quality for the naked eye, why is the file size is so different ?

• ffmpeg : Resource temporarily unavailable

  26 octobre 2015, par Cabbage soup

  I’m trying to run ffmpeg on a linux server (info from uname -a) :

  Linux comp32 2.6.32-279.14.1.el6.x86_64 #1 SMP Tue Nov 6 11:21:14 CST 2012 x86_64 x86_64 x86_64 GNU/Linux

  ffmpeg (together with the required encoders and decoders) compiles successfully on the system, but when I try to perform a basic operation like the following : ffmpeg -v debug -i example.m4v image%d.jpg, I get a slightly cryptic error message :

  ffmpeg version 2.8.1 Copyright (c) 2000-2015 the FFmpeg developers
  
  built with gcc 4.7.1 (GCC)
  
  configuration: --prefix=/users/albanie/local/usr
  
  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
  
  libswscale      3.  1.101 /  3.  1.101
  
  libswresample   1.  2.101 /  1.  2.101
  
  Splitting the commandline.
  
  Reading option '-v' ... matched as option 'v' (set logging level) with argument 'debug'.
  
  Reading option '-i' ... matched as input file with argument 'example.m4v'.
  
  Reading option 'image%d.jpg' ... matched as output file.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option v (set logging level) with argument debug.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input file example.m4v.
  
  Successfully parsed a group of options.
  
  Opening an input file: example.m4v.
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ee2380] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ee2380] ISO: File Type Major Brand: M4V
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ee2380] Before avformat_find_stream_info() pos: 185580655 bytes read:927102 seeks:1
  
  [h264 @ 0x2ee3720] no picture
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ee2380] All info found
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ee2380] After avformat_find_stream_info() pos: 24214 bytes read:959870 seeks:2 frames:3
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'example.m4v':
  
  Metadata:
  
    major_brand     : M4V
  
    minor_version   : 512
  
    compatible_brands: isomiso2avc1
  
    encoder         : Lavf56.25.101
  
  Duration: 00:13:47.93, start: 0.033333, bitrate: 1793 kb/s
  
  Stream #0:0(und), 2, 1/30000: Video: h264 (High), 4 reference frames (avc1 / 0x31637661), yuv420p(left), 720x576 [SAR 64:45 DAR 16:9], 1001/60000, 1656 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
  Metadata:
  
    handler_name    : VideoHandler
  
  Stream #0:1(eng), 1, 1/48000: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
  Metadata:
  
    handler_name    : SoundHandler
  
  Successfully opened the file.
  
  Parsing a group of options: output file image%d.jpg.
  
  Successfully parsed a group of options.
  
  Opening an output file: image%d.jpg.
  
  Successfully opened the file.
  
  detected 32 logical cores
  
  [graph 0 input from stream 0:0 @ 0x303f7c0] Setting 'video_size' to value '720x576'
  
  [graph 0 input from stream 0:0 @ 0x303f7c0] Setting 'pix_fmt' to value '0'
  
  [graph 0 input from stream 0:0 @ 0x303f7c0] Setting 'time_base' to value '1/30000'
  
  [graph 0 input from stream 0:0 @ 0x303f7c0] Setting 'pixel_aspect' to value '64/45'
  
  [graph 0 input from stream 0:0 @ 0x303f7c0] Setting 'sws_param' to value 'flags=2'
  
  [graph 0 input from stream 0:0 @ 0x303f7c0] Setting 'frame_rate' to value '30000/1001'
  
  [graph 0 input from stream 0:0 @ 0x303f7c0] w:720 h:576 pixfmt:yuv420p tb:1/30000 fr:30000/1001 sar:64/45 sws_param:flags=2
  
  [format @ 0x2f750c0] compat: called with args=[yuvj420p|yuvj422p|yuvj444p]
  
  [format @ 0x2f750c0] Setting 'pix_fmts' to value 'yuvj420p|yuvj422p|yuvj444p'
  
  [auto-inserted scaler 0 @ 0x2f75f00] Setting 'flags' to value 'bicubic'
  
  [auto-inserted scaler 0 @ 0x2f75f00] w:iw h:ih flags:'bicubic' interl:0
  
  [format @ 0x2f750c0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed_null_0' and the filter 'format'
  
  [AVFilterGraph @ 0x303f720] query_formats: 4 queried, 2 merged, 1 already done, 0 delayed
  
  [auto-inserted scaler 0 @ 0x2f75f00] picking yuvj420p out of 3 ref:yuv420p alpha:0
  
  [swscaler @ 0x2f664a0] deprecated pixel format used, make sure you did set range correctly
  
  [auto-inserted scaler 0 @ 0x2f75f00] w:720 h:576 fmt:yuv420p sar:64/45 -> w:720 h:576 fmt:yuvj420p sar:64/45 flags:0x4
  
  [mjpeg @ 0x2ee96c0] Forcing thread count to 1 for MJPEG encoding, use -thread_type slice or a constant quantizer if you want to use multiple cpu cores
  
  [mjpeg @ 0x2ee96c0] intra_quant_bias = 96 inter_quant_bias = 0
  
  Output #0, image2, to 'image%d.jpg':
  
  Metadata:
  
    major_brand     : M4V
  
    minor_version   : 512
  
    compatible_brands: isomiso2avc1
  
    encoder         : Lavf56.25.101
  
  Stream #0:0(und), 0, 1001/30000: Video: mjpeg, 1 reference frame, yuvj420p(pc, left), 720x576 [SAR 64:45 DAR 16:9], 1001/30000, q=2-31, 200 kb/s, 29.97 fps, 29.97 tbn, 29.97 tbc (default)
  
  Metadata:
  
    handler_name    : VideoHandler
  
    encoder         : Lavc56.60.100 mjpeg
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
  
  Error while opening decoder for input stream #0:0 : Resource temporarily unavailable
  
  [AVIOContext @ 0x2eeaee0] Statistics: 959870 bytes read, 2 seeks

  I also tried using a static build off ffmpeg, downloaded from here, but got the same resource temporarily unavailable message. Any ideas on how I might be able to fix this ?