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• how to merge 2 videos by Fade In and Fade out effects in swift

  9 novembre 2017, par PRITAM SATPUTE

  I need to merge 2 videos with effects like Fade In or Fade out or cross fade etc.
  How can I achieve it ?

  Got solutions like use ffmpeg. Let me know how can we implement it ?
  How can we use ffmpeg in ios or any other solution ?

• How to change ffmpeg -threads settings [migrated]

  5 août 2014, par Jacob

  Working on a tube site. I’m running videos through ffmpeg on a linux dedicated server to convert to mp4.

  The server specs :

  Architecture:          x86_64
  
  CPU op-mode(s):        32-bit, 64-bit
  
  Byte Order:            Little Endian
  
  CPU(s):                8
  
  On-line CPU(s) list:   0-7
  
  Thread(s) per core:    2
  
  Core(s) per socket:    4
  
  Socket(s):             1
  
  NUMA node(s):          1
  
  Vendor ID:             GenuineIntel
  
  CPU family:            6
  
  Model:                 60
  
  Stepping:              3
  
  CPU MHz:               3491.749
  
  BogoMIPS:              6983.49
  
  Virtualization:        VT-x
  
  L1d cache:             32K
  
  L1i cache:             32K
  
  L2 cache:              256K
  
  L3 cache:              8192K
  
  NUMA node0 CPU(s):     0-7

  Issue during testing is that even only doing 4-5 at once, the server load skyrockets to an average of around 36. This is just a single person. I imagine when it opens, many people will be uploading at once.

  It seems ffmpeg tries to use all the resources available per conversion.

  I’ve heard there’s a -threads setting you can change, but I cannot find it. I have an 8 cpu server. It’s only used for conversions, so I’ve heard the best setting would be between 2 and 4. I can test it out.

  But how do I change this setting ? Everything I see online discusses this setting, but not the steps to change it.

• Where is my ffmpeg stream getting saved to ?

  14 mars 2013, par Chris

  I'm just starting to explore ffmpeg (ultimately for use with openCV), and I'm running this command :

  root@beaglebone:/# ffmpeg -f video4linux2 -r 25 -s 640x480 -i /dev/video0 /out.avi

  At which point the camera indicator light turns on and it appears to be capturing. However when I end it with CTRL+C, the file is nowhere to be found.

  Any thoughts ?

  Full output :

  root@beaglebone:/# ffmpeg -f video4linux2 -r 25 -s 640x480 -i /dev/video0 /out.avi
  
  ffmpeg version v0.7.4, Copyright (c) 2000-2011 the Libav developers
  
    built on Oct  9 2012 10:50:57 with gcc 4.5.4 20120305 (prerelease)
  
    configuration: --enable-shared --enable-pthreads --enable-gpl --enable-postproc --enable-avfilter --cross-prefix=arm-angstrom-linux-gnueabi- --prefix=/usr --enable-ffserver --enable-ffplay --enable-x11grab --enable-libtheora --enable-libvorbis --arch=arm --target-os=linux --enable-cross-compile --extra-cflags=' -fexpensive-optimizations -fomit-frame-pointer -O4 -ffast-math -march=armv7-a -fno-tree-vectorize -mthumb-interwork -mfloat-abi=softfp -mfpu=neon -mtune=cortex-a8 --sysroot=/home/koen/setup-scripts/build/tmp-angstrom_v2012_05-eglibc/sysroots/beaglebone' --extra-ldflags='-Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed' --sysroot=/home/koen/setup-scripts/build/tmp-angstrom_v2012_05-eglibc/sysroots/beaglebone --enable-hardcoded-tables --cpu=cortex-a8
  
    libavutil    51.  7. 0 / 51.  7. 0
  
    libavcodec   53.  6. 0 / 53.  6. 0
  
    libavformat  53.  3. 0 / 53.  3. 0
  
    libavdevice  53.  0. 0 / 53.  0. 0
  
    libavfilter   2.  4. 0 /  2.  4. 0
  
    libswscale    2.  0. 0 /  2.  0. 0
  
    libpostproc  52.  0. 0 / 52.  0. 0
  
  ^C
  
  root@beaglebone:/# ls
  
  bin   dev  home  lost+found  mnt  proc  sbin  tmp  var
  
  boot  etc  lib   media       opt  run   sys   usr
  
  root@beaglebone:/#