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• After scaled video, it convert transparent background to white

  8 mars 2017, par Sohaib Raza

  I scaled video using ffmpeg. When i scaled video, the output video having white background ,while the input video having transparent background.
  below command using for scaled video.

  ffmpeg -i inputVideo.mp4 -vf scale=100:100 outputVideo.mp4

  you can see the image below that is take from my video,for more understanding my problem.

  image from input video
  

  you can see the above image from input video having no white background.

  image from output video
  

  you can see the above image from output video having white backgournd.

  please give me your valuable answer regarding this question.
  any answer will be very appreciate.

  D: onProgress:   configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --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/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
D: onProgress:   libavutil      55. 17.103 / 55. 17.103
D: onProgress:   libavcodec     57. 24.102 / 57. 24.102
D: onProgress:   libavformat    57. 25.100 / 57. 25.100
D: onProgress:   libavdevice    57.  0.101 / 57.  0.101
D: onProgress:   libavfilter     6. 31.100 /  6. 31.100
D: onProgress:   libswscale      4.  0.100 /  4.  0.100
D: onProgress:   libswresample   2.  0.101 /  2.  0.101
D: onProgress:   libpostproc    54.  0.100 / 54.  0.100
D: onProgress: Input #0, gif, from '/storage/emulated/0/Pictures/eye.gif':
D: onProgress:   Duration: N/A, bitrate: N/A
D: onProgress:     Stream #0:0: Video: gif, bgra, 480x190, 5 fps, 10 tbr, 100 tbn, 100 tbc
D: onProgress: Output #0, gif, to '/storage/emulated/0/GIF/REV20170308_101145.gif':
D: onProgress:   Metadata:
D: onProgress:     encoder         : Lavf57.25.100
D: onProgress:     Stream #0:0: Video: gif, bgr8, 125x56, q=2-31, 200 kb/s, 10 fps, 100 tbn, 10 tbc
D: onProgress:     Metadata:
D: onProgress:       encoder         : Lavc57.24.102 gif
D: onProgress: Stream mapping:
D: onProgress:   Stream #0:0 -> #0:0 (gif (native) -> gif (native))
D: onProgress: Press [q] to stop, [?] for help
D: onProgress: frame=   11 fps=0.0 q=-0.0 Lsize=      17kB time=00:00:02.90 bitrate=  48.8kbits/s speed=14.8x<br />
D: onProgress: video:16kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 5.287261%
D: Started command : ffmpeg [Ljava.lang.String;@422f62d0
D: onSuccess: ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
    built with gcc 4.8 (GCC)
    configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --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/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
    libavutil      55. 17.103 / 55. 17.103
    libavcodec     57. 24.102 / 57. 24.102
    libavformat    57. 25.100 / 57. 25.100
    libavdevice    57.  0.101 / 57.  0.101
    libavfilter     6. 31.100 /  6. 31.100
    libswscale      4.  0.100 /  4.  0.100
    libswresample   2.  0.101 /  2.  0.101
    libpostproc    54.  0.100 / 54.  0.100
  Input #0, gif, from '/storage/emulated/0/Pictures/eye.gif':
    Duration: N/A, bitrate: N/A
      Stream #0:0: Video: gif, bgra, 480x190, 5 fps, 10 tbr, 100 tbn, 100 tbc
  Output #0, gif, to '/storage/emulated/0/GIF/REV20170308_101145.gif':
    Metadata:
      encoder         : Lavf57.25.100
      Stream #0:0: Video: gif, bgr8, 125x56, q=2-31, 200 kb/s, 10 fps, 100 tbn, 10 tbc
      Metadata:
        encoder         : Lavc57.24.102 gif
  Stream mapping:
    Stream #0:0 -> #0:0 (gif (native) -> gif (native))
  Press [q] to stop, [?] for help
  frame=   11 fps=0.0 q=-0.0 Lsize=      17kB time=00:00:02.90 bitrate=  48.8kbits/s speed=14.8x<br />
  video:16kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 5.287261%

• Where is libavformat for FFMpeg located on Snow Leopard ?

  29 septembre 2011, par d.win

  Having an issue with getting a makefile to find the correct libraries and header files for a .c program I'm trying to compile. I'm trying to compile an open source segmenter for Apple's HTTP Live Streaming and it requires libavformat and other FFMpeg libraries to compile. I used Mac Ports to install FFMpeg and when I run "which ffmpeg" at command line, the directory it shows is opt/local/bin/ffmpeg, but after searching around, this doesn't seem to be the directory with the libraries.

  It seems that the libraries are located in opt/local/include because that is where I see the header files. Here is my makefile with the suspected directory :

  all :
  gcc -Wall -g live_segmenter.c -o live_segmenter -I/opt/local/include -I/opt/local/bin -I/opt/local/include/libavutil -L/opt/local/include/libavformat -libavformat -L/opt/local/include -libavcodec -L/opt/local/include -libavutil -L/opt/local/include -libavcore -lbz2 -lm -lz -lfaac -lmp3lame -lx264 -lfaad -lpthread

  clean:
  
  rm -f live_segmenter

  And here is the output after trying to compile :

  gcc -Wall -g live_segmenter.c -o live_segmenter -I/opt/local/include -I/opt/local/bin -
  I/opt/local/include/libavutil -L/opt/local/include/libavformat -libavformat -L/opt/local/include -libavcodec -L/opt/local/include -libavutil -L/opt/local/include -libavcore -lbz2 -lm -lz -lfaac -lmp3lame -lx264 -lfaad -lpthread

  ld: library not found for -libavformat
  
  collect2: ld returned 1 exit status
  
  make: *** [all] Error 1

  I also tried running "ffmpeg -version" to see if ffmpeg was built correctly and it seems to be so I have run out of ideas on what to do. Any help or point in the right direction would be great. Thank you !

• How can I create a c++ console application which makes use of an open source c project

  2 octobre 2018, par Bogdan Daniel

  I’ve been playing around with a compiled version of https://github.com/FFmpeg/FFmpeg. But it has some problems, during the closing of an opened stream using avio_close(it takes a really long time to close it).

  I’ve been trying to understand what could go wrong by reading through the implementation, but couldn’t find anything.

  What I would like to do, is to actually have a C++ console application which uses the c files and to debug them while running the code(using breakpoints and so on).

  Unfortunately I cannot find any information on how to set it up. Simply copying the files in a new console application is not enough.

  Thanks in advance for any suggestions.

  Edit : I can already see a closing vote. If this question is not appropriate for this website, I will delete it. But please point me in the right direction of where to post it.Although it is quite a general question, I believe that it is clear and enough information has been provided.

  Edit2 : Yes, I was a bit unclear about what I’m using.

  I’m using Visual Studio Community 2017 on Windows 10 for creating the C++ console application.

  Edit3 :

  Steps that I’ve taken into using the source files into my console application which was using the DLLs.

  1. Copy all of the contents of the FFmpeg-master to my console application
  2. Include all of them in the c++ console application project
  3. Run a build - takes forever and has infinite build errors( > 1000) - probably compiler related

  Edit4 :

  I have no actual errors with avio_close, it just takes too long to close the stream. What I found out when playing around with the settings is that when the fifo_size parameter is set, closing the stream is a lot faster depending on how small the set value is. And it sort of makes sense since fifo_size is related to the packet size, but I haven’t found out where in the code this size has an impact.

  fifo_size=units
  Set the UDP receiving circular buffer size, expressed as a number of packets with size of 188 bytes. If not specified defaults to 7*4096.

  Edit5 : I still haven’t found a way to compile the open source ffmpeg project into libs, dlls and pdbs. Am I the first one needing such files(seems unrealistic) ?
  The only tool capable of delivering those so far is vcpkg. The only problem is that it compiles the 3.3.3 version and the latest is 4.0.2 .

  I tried to modify the vcpkg\ports\ffmpeg\portfile.cmake file to include the latest version of ffmpeg, but it doesn’t build it.

  Are there any other suggestions ?