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• OpenCV won't open some videos of many videos of the same format

  2 octobre 2013, par OpenMinded

  I am using Visual Studio 2012 with OpenCV 2.4.6.

  I have 4 videos that I recorded one by one with my Nokia Lumia 920. OpenCV won't open .mp4 format from my phone by the default. So I converted all these 4 videos using Sony Vegas to .mp4 with the SAME preferences for all of them. Now the problem is that OpenCV has a problem to open two of them. The other two works like a charm with no problem. Below is the information about codec that I used (Yes, it is the same for all videos) :

  

  And this is the error :

  

  Why is it so that they are the same type but only a few of them are loaded properly ?

• How to avoid ffmpeg filter_complex overriding the fps of a file ?

  7 juillet 2023, par des_r_clarke

  I'm fairly new to ffmpeg so apologies if this is a simple problem.

  


  I'm trying to tile four 60 fps videos using the script below. It works, but the output is at 25 fps. When I try to use -r to force it back to 60, it looks like 25 fps upsampled to 60, counting duplicated frames when rendering.

  


  How can I preserve the original files ?

  


  ffmpeg -i vln1.mp4 -i vln2.mp4 -i vla.mp4 -i cello.mp4 -filter_complex \
  "nullsrc=size=2800x2400 [base]; \
   [0:v] setpts=PTS-STARTPTS, scale=2800x600 [A]; \
   [1:v] setpts=PTS-STARTPTS, scale=2800x600 [B]; \
   [2:v] setpts=PTS-STARTPTS, scale=2800x600 [C]; \
   [3:v] setpts=PTS-STARTPTS, scale=2800x600 [D]; \
   [base] [A] overlay=shortest=0 [tmp1]; \
   [tmp1][B] overlay=shortest=0:y=600 [tmp2]; \
   [tmp2][C] overlay=shortest=0:y=1200 [tmp3]; \
   [tmp3][D] overlay=shortest=0:y=1800" \
  -c:v libx264 quartetscore.mp4


  


• Android FFmpeg reports "file protocol not found"

  27 avril 2017, par Abdul Mateen

  I am trying to convert sequence images to video using ffmpeg command in android.
  I have build ffmpeg for android and put ffmpeg binary file in /data/local folder.
  I am running ffmpeg command using Runtime.getruntime.execute("mycommand") in Android.

  Stucture of mycommand is like this

  "/data/local/ffmpeg -r 40 qscale 2 -i /mnt/sdcard/images/img%d.jpg /mnt/sdcard/images/finalvideo.mp4" 

  mycommand contains the path of a folder where I placed all my sequence images. Running this command gives me error "protocol not found".

  Also I read that file protocol is default in ffmpeg documentation.

  How can I run such commands ?

  The Error I am getting after running simple command like ffmpeg -i /mnt/sdcard/vid.mp4

  ffmpeg version 0.11.1.git Copyright (c) 2000-2012 the FFmpeg developers
  
  built on Sep 26 2012 11:58:35 with gcc 4.4.3 (GCC)
  
  configuration: --target-os=linux --prefix=/home/esteves/android-ffmpeg --enable-cross-compile --enable-runtime-cpudetect --disable-asm --arch=arm --cc=/home/esteves/android-ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc --cross-prefix=/home/esteves/android-ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi- --disable-stripping --nm=/home/esteves/android-ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi-nm --sysroot=/home/esteves/android-ndk/platforms/android-8/arch-arm --enable-nonfree --enable-version3 --disable-everything --enable-gpl --disable-doc --enable-avresample --enable-demuxer=amr --enable-demuxer=aac --enable-demuxer=rawvideo --enable-demuxer=rtsp --enable-muxer=rtsp --enable-muxer=flv --enable-muxer=mpegts --enable-muxer=mp4 --enable-demuxer=rtp --enable-demuxer=rtp --disable-ffplay --disable-ffserver --enable-ffmpeg --disable-ffprobe --enable-libx264 --enable-encoder=libx264   libavutil      51. 72.100 / 51. 72.100
  
  libavcodec     54. 55.100 / 54. 55.100
  
  libavformat    54. 25.105 / 54. 25.105
  
  libswscale      2.  1.101 /  2.  1.101
  
  error of main   libswresample   0. 15.100 /  0. 15.100
  
  error of main   libpostproc    52.  0.100 / 52.  0.100
  
  /mnt/sdcard/vid.mp4: Protocol not found