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• concatenate MP4 videos with FFmpeg using concat demuxer in android

  10 mai 2016, par Ara Badalyan

  I want to concatenate MP4 videos with FFmpeg, the problem is when I want to merge videos taken with Iphone and Android it throws problem :

  Non-monotonous DTS in output stream 0:1 ; previous : 150528, current : 139268 ; changing to 150529. This may result in incorrect timestamps in the output file.

  This is my code

  merge.txt

  file 'iphone.mp4'
  
  file 'android.mp4'

  FFmpeg command

  ffmpeg -f concat -i marge.txt -c copy -y merge.mp4

  If I can’t merge this videos how can I make them with same parameters (frame rate, bitrate...) and merge them ?

  I use FFmpeg version 2.4.2, because I can’t find android FFmpeg library higher then 2.4.2.

  This is complete console output of : ffmpeg -i android.mp4 -i iphone.mp4

  ffmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
  
         built on Oct  7 2014 15:08:46 with gcc 4.8 (GCC)
  
                 configuration: --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/sb/Source-Code/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=/home/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/sb/Source-Code/ffmpeg-android/build/armeabi-v7a-neon --extra-cflags='-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -mfpu=neon' --extra-ldflags='-L/home/sb/Source-Code/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
                 libavutil      54.  7.100 / 54.  7.100
  
                 libavcodec     56.  1.100 / 56.  1.100
  
                 libavformat    56.  4.101 / 56.  4.101
  
                 libavdevice    56.  0.100 / 56.  0.100
  
                 libavfilter     5.  1.100 /  5.  1.100
  
                 libswscale      3.  0.100 /  3.  0.100
  
                 libswresample   1.  1.100 /  1.  1.100
  
                 libpostproc    53.  0.100 / 53.  0.100
  
               Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'android.mp4':
  
                 Metadata:
  
                   major_brand     : isom
  
           minor_version   : 512
  
                   compatible_brands: isomiso2avc1mp41
  
           encoder         : Lavf57.21.101
  
                 Duration: 00:00:01.29, start: 0.023220, bitrate: 308 kb/s
  
           Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x1280 [SAR 1:1 DAR 9:16], 113 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default)
  
           Metadata:
  
                     handler_name    : VideoHandler
  
           Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 186 kb/s (default)
  
           Metadata:
  
                     handler_name    : SoundHandler
  
       Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'iphone.mp4':
  
                 Metadata:
  
                   major_brand     : mp42
  
           minor_version   : 1
  
                   compatible_brands: mp41mp42isom
  
           creation_time   : 2016-05-10 09:46:30
  
                 Duration: 00:00:02.63, start: 0.000000, bitrate: 4768 kb/s
  
           Stream #1:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 101 kb/s (default)
  
           Metadata:
  
                     creation_time   : 2016-05-10 09:46:30
  
                     handler_name    : Core Media Audio
  
           Stream #1:1(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 720x1280, 4657 kb/s, 30 fps, 30 tbr, 600 tbn, 1200 tbc (default)
  
           Metadata:
  
                     creation_time   : 2016-05-10 09:46:30
  
                     handler_name    : Core Media Video
  
       At least one output file must be specified

• what is FFmpeg ?

  18 mai 2012, par mirdad

  I am using the LINK to take frame from video ..but it says to create a commercial project that decodes H264 video, we have to make sure that we get a license from MPEG LA.
  Why should we get license ?some tutorials say that we have to give complete source code to
  LGPL , if we integrate statically FFMPEG.what is mean by statically ? what is the other option ?can we submit our App to Appstore(for storing video streams in server) without getting license from LGPL ?i am getting confused ? any help please ?

• Integrating ffmpeg in xcode5, Cannot find gcc

  22 juin 2014, par user2007547

  I have been trying to integrate ffmpeg in xcode5.
  The step [here][1]

  [1] : FFMPEG integration on iphone/ ipad project says that cc parameter needs to be gcc in iphoneOs.platform.

  But I could not find it in my xcode5.
  It is present in xcode 4.6.3 that I have.

  I tried the ./configure command with cc as gcc from xcode4.
  Something like this :

  ./configure --prefix=armv7 --disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-    ffserver --enable-avresample --enable-cross-compile --   sysroot="/Applications/Xcode5.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk" --target-os=darwin --cc="/Applications/Xcode4.6.3.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc" --extra-cflags="-arch armv7 -mfpu=neon -miphoneos-version-min=6.0" --extra-ldflags="-arch armv7 -isysroot /Applications/Xcode5.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -miphoneos-version-min=6.0" --arch=arm --cpu=cortex-a9 --enable-pic

  It works ok but then the make command after fails like this :

  libavcodec/arm/mdct_vfp.S:113:unknown register alias 'TCOS_D0_HEAD'
  
  libavcodec/arm/mdct_vfp.S:114:unknown register alias 'TCOS_D1_HEAD'
  
  libavcodec/arm/mdct_vfp.S:115:unknown register alias 'TCOS_S0_TAIL'
  
  make: *** [libavcodec/arm/mdct_vfp.o] Error 1

  What am I doing wrong here ?? Where can I find gcc for xcode5 ??