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• Full C++ example avlib\FFMPEG multi input video filtering [on hold]

  30 juillet 2018, par Stefan Pintilie

  I am asking a question and also answering to it, on how to apply a multi input video complex filter using FFMPEG/avlib/avfiler libraries. I am doing this in hope that will help you, since it took couple of days to dig into ffmpeg code source, understanding it, putting the pieces together and make it work. The same could be applied to audio filtering.

  Everything starting from translating the following ffmpeg command into C++ code :

  ffmpeg -i world.mp4 -i back.png -filter_complex "[0:v]pad=1280:1000:0:0:black[pad];[pad][1:v]overlay=140:720[out]" -map "[out]" -map 0:a output.mp4

  Is basically stacking 2 videos on top of each other. The video from bottom has bigger width, so the final video file has the width of the bottom video and the height of all 2 together.

  Anyway that is just an example, the code example I am going to give you it takes any number of input files and a complex filter description, then producing the output.

• ffmpeg for android out of memory

  15 juin 2018, par Rafael Lima

  I’m getting an weird error when enconding a video with ffmpeg on android

  Failed to inject frame into filter network: Out of memory

  Althoug is a pretty objective error, I do believe this is some "generic message" for another problem, because the video I used for testing is 17MB and less than 11 seconds length and I’ve sucessfully tested with videos bigger than 200MB and longer than 5min

  This problem happens to any video recorded on my phone (the videos were recorded and play fine on my phone but i cant reencode them... other video h264 were encoded fine on same phone)

  this is ffmpeg output

  ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with Android (4691093 based on r316199) clang version 6.0.2 (https://android.googlesource.com/toolchain/clang 183abd29fc496f55536e7d904e0abae47888fc7f) (https://android.googlesource.com/toolchain/llvm 34361f192e41ed6e4e8f9aca80a4ea7e9856f327) (based on LLVM 6.0.2svn)
  
    configuration: --prefix=/home/rafa/Desktop/m4/build --target-os=android --arch=i686 --cpu=i686 --cross-prefix=/home/rafa/Desktop/m4/ndk/toolchain/i686/bin/i686-linux-android- --enable-cross-compile --cc=/home/rafa/Desktop/m4/ndk/toolchain/i686/bin/clang --cxx=/home/rafa/Desktop/m4/ndk/toolchain/i686/bin/clang++ --pkg-config=/usr/bin/pkg-config --pkg-config-flags=--static --enable-pic --enable-gpl --enable-nonfree --enable-static --disable-shared --enable-ffmpeg --disable-ffplay --disable-ffprobe --disable-doc --disable-devices --enable-libx264 --enable-libfdk-aac --enable-bsf=aac_adtstoasc --disable-asm
  
    libavutil      56. 14.100 / 56. 14.100
  
    libavcodec     58. 18.100 / 58. 18.100
  
    libavformat    58. 12.100 / 58. 12.100
  
    libavdevice    58.  3.100 / 58.  3.100
  
    libavfilter     7. 16.100 /  7. 16.100
  
    libswscale      5.  1.100 /  5.  1.100
  
    libswresample   3.  1.100 /  3.  1.100
  
    libpostproc    55.  1.100 / 55.  1.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/data/data/com.tomatedigital.toolsforinstagram/qqq.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2018-06-09T04:28:55.000000Z
  
      location        : -08.0638-034.8723/
  
      location-eng    : -08.0638-034.8723/
  
      com.android.version: 7.0
  
    Duration: 00:00:09.06, start: 0.000000, bitrate: 17349 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 17088 kb/s, SAR 1:1 DAR 16:9, 30.04 fps, 30 tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        rotate          : 90
  
        creation_time   : 2018-06-09T04:28:55.000000Z
  
        handler_name    : VideoHandle
  
      Side data:
  
        displaymatrix: rotation of -90.00 degrees
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 255 kb/s (default)
  
      Metadata:
  
        creation_time   : 2018-06-09T04:28:55.000000Z
  
        handler_name    : SoundHandle
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Out of memory
  
  Error while processing the decoded data for stream #0:0
  
  Conversion failed!

• why the last frame lost during video to GIF with FFmpeg in program ?

  4 juillet 2018, par nUOs

  Two questions come first, that 1) the last video frame lost during the conversion from avi or mp4 to gif with error message "error get frame from buffer sink end of file" ;2) if scale in filters set to high level (such as 1920x1080) and with usual fps (such as 15, 25) the memory consumed exploded to bigger than 1.8G(source video duration is about 20+seconds).

  The running code is from the answer of the question How to use palettegen and paletteuse filters with FFmpeg in C++ ?.

  Several solutions have failed to solve the problem. such as change the decode the source video and encode the gif logic (in a loop way), it just can’t encode even one frame.

  So is there any problem about the code or logic in the linked page ? or even any clue maybe grateful !

  Aside from the "powerful" ffmpeg library, is there any library that can convert avi or mp4 to gif programmly ? i have tried ImageMagick library which is based on ffmpeg, CxImage which is less features and not sufficient to the demands, and the confusing GIFLIB with which i need some demo code and so on...

  any clue is grateful :)