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• ffmpeg alpha merge mp4 to alpha mov (heic)

  25 mars 2022, par Alex

  I have two video files (mp4), matte/alpha (white silhouette) and normal.
I want to create a .mov file with transparent background that is possible to play on iOS/Safari devices.

  


  Commands I'm trying to run :

  


  ffmpeg -i color.mp4 -i alpha.mp4 -filter_complex '[1][0]scale2ref[mask][main];[main][mask]alphamerge' -c:v libx265 -tag:v hvc1 -pix_fmt yuva420p output.mov

ffmpeg -i color.mp4 -i alpha.mp4 -filter_complex '[1][0]scale2ref[mask][main];[main][mask]alphamerge' -c:v qtrle output.mov


  


  Expected result : Transparent background

  


  Actual result : Background is not transparent

  


  What I'm trying to achieve :
https://rotato.app/blog/transparent-videos-for-the-web

  


• How can I find out what this ffmpeg error code means ?

  27 septembre 2018, par Asik

  I’m using the function avcodec_decode_video2. On an encoding change in the stream, it returns -1094995529. The documentation only states :

  On error a negative value is returned, otherwise the number of bytes
  used or zero if no frame could be decompressed.

  But there doesn’t seem to be an enum of return codes or any other form of documentation. What does the error mean and how can I determine that in general ?

• FFmpeg av_register_all() memory leak

  1er septembre 2015, par Joe Allen

  I made a conversion function and I started to figure out the memory leaks.I started by make a small program to figure out the leaks but for some reason av_register_all() is also getting a memory leak. Is there something that I am suppose to free ?

  main.cpp :

  #include 
  
  #include <string>
  
  #include <queue>   
  
  #include <deque>
  
  #include <iostream>
  
  
  
  //#ifdef __cplusplus
  
  extern "C" {    
  
  #ifndef __STDC_CONSTANT_MACROS
  
  #define __STDC_CONSTANT_MACROS
  
  #endif
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libswresample></libswresample>swresample.h>
  
  #include <libswscale></libswscale>swscale.h>
  
  #include <libavutil></libavutil>channel_layout.h>
  
  #include <libavutil></libavutil>common.h>
  
  #include <libavutil></libavutil>imgutils.h>
  
  #include <libavutil></libavutil>mathematics.h>
  
  #include <libavutil></libavutil>avassert.h>
  
  #include <libavutil></libavutil>avstring.h>
  
  #include <libavutil></libavutil>frame.h>
  
  #include <libavutil></libavutil>opt.h>
  
  #include <libavutil></libavutil>samplefmt.h>
  
  #include <libavutil></libavutil>timestamp.h>
  
  #include <libavfilter></libavfilter>avfilter.h> 
  
  #include <libavfilter></libavfilter>buffersrc.h> 
  
  #include <libavfilter></libavfilter>buffersink.h> 
  
  #include <libavutil></libavutil>dict.h>
  
  }
  
  
  
  
  
  int main (int argc, char ** argv){
  
      AVFrame *frame;
  
      AVFrame *filteredFrame;
  
      AVPacket pkt;
  
  
  
      //Initialize all codecs
  
      av_register_all();
  
  }
  
  </iostream></deque></queue></string>

  Output from valgrind :

  ==31165== HEAP SUMMARY:
  
  ==31165==     in use at exit: 81 bytes in 2 blocks
  
  ==31165==   total heap usage: 4 allocs, 2 frees, 167 bytes allocated
  
  ==31165== 
  
  ==31165== Searching for pointers to 2 not-freed blocks
  
  ==31165== Checked 9,196,888 bytes
  
  ==31165== 
  
  ==31165== 32 bytes in 1 blocks are still reachable in loss record 1 of 2
  
  ==31165==    at 0x4C2CC70: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
  
  ==31165==    by 0x6DE768F: _dlerror_run (dlerror.c:141)
  
  ==31165==    by 0x6DE70C0: dlopen@@GLIBC_2.2.5 (dlopen.c:87)
  
  ==31165==    by 0x8DC7273: x265_api_get_63 (in /usr/local/lib/libx265.so.63)
  
  ==31165==    by 0x5958E74: ??? (in /usr/local/lib/libavcodec.so.56.41.100)
  
  ==31165==    by 0x59D76B1: avcodec_register_all (in /usr/local/lib/libavcodec.so.56.41.100)
  
  ==31165==    by 0x4E6B342: av_register_all (in /usr/local    /lib/libavformat.so.56.36.100)
  
  ==31165==    by 0x400830: main (main.cpp:39)
  
  ==31165== 
  
  ==31165== 49 bytes in 1 blocks are still reachable in loss record 2 of 2
  
  ==31165==    at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
  
  ==31165==    by 0x400FDC0: _dl_signal_error (dl-error.c:90)
  
  ==31165==    by 0x40146CF: _dl_open (dl-open.c:715)
  
  ==31165==    by 0x6DE702A: dlopen_doit (dlopen.c:66)
  
  ==31165==    by 0x400FFF3: _dl_catch_error (dl-error.c:187)
  
  ==31165==    by 0x6DE762C: _dlerror_run (dlerror.c:163)
  
  ==31165==    by 0x6DE70C0: dlopen@@GLIBC_2.2.5 (dlopen.c:87)
  
  ==31165==    by 0x8DC7273: x265_api_get_63 (in /usr/local/lib/libx265.so.63)
  
  ==31165==    by 0x5958E74: ??? (in /usr/local/lib/libavcodec.so.56.41.100)
  
  ==31165==    by 0x59D76B1: avcodec_register_all (in /usr/local/lib/libavcodec.so.56.41.100)
  
  ==31165==    by 0x4E6B342: av_register_all (in /usr/local/lib/libavformat.so.56.36.100)
  
  ==31165==    by 0x400830: main (main.cpp:39)
  
  ==31165== 
  
  ==31165== LEAK SUMMARY:
  
  ==31165==    definitely lost: 0 bytes in 0 blocks
  
  ==31165==    indirectly lost: 0 bytes in 0 blocks
  
  ==31165==      possibly lost: 0 bytes in 0 blocks
  
  ==31165==    still reachable: 81 bytes in 2 blocks
  
  ==31165==         suppressed: 0 bytes in 0 blocks
  
  ==31165== 
  
  ==31165== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
  
  ==31165== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)