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• Real time stereo video stream. How to start

  29 juin 2015, par victor jung

  Here is my problem :

  I have at one side two webcams plugged in a linux computer, and on the other side, an android smartphone. My goal is to program a real time stream of the 2 webcams, and display that stream on the smartphone (to be used in a google cardboard mask). I read quite a lot on the subject, and I found several way to achieve this.

  First there is ffmpeg, which could encode and stream.

  But I need to modify the pictures at some point, to re-size them / or to ad some kind of distortion. So I thought it would be great if I can get the 2 images, with openCv maybe, playwith them, build a new one, and stream them, but how could ffmpeg deal with the newly created image ?

  The other option would be to get the 2 pics and play with them with openCv too, but then, hardcode a stream over, UDP in RTP style, but wouldnt be hard to display the stream nicely on the phone ?, and how to cut the image to fit in small packets ?

  Thanks for your help, I am still digging in the subject, so if you have any other way to do it I am taking !

  ps : My introducing Hello, won’t stay at the beginning of my message...
  Have a nice day every body.
  d-4 before frieday.

• convert avi to mp4 - centos - propper command

  16 novembre 2012, par Rares Daniel

  i need some help, please. Im strugling for a time now, with ffmpeg/mencoder/mp4box.

  i need to convert videos from avi to mp4, to maintain same quality, and IF possible, to reduce size.

  Im using centos 6.3 64bit

  i tried several commands :
  ffmpeg -i input.avi -acodec libfaac -b:a 128k -vcodec mpeg4 -b:v 1200k -flags +aic+mv4 output.mp4
  with : qscale 1

  the commands work, but the output file cant be played via httpd, i get (media time unsuported) or the output file is too large.
  I need an command to convert from avi to mp4 using h264 and faac.

  With windows , i have this "HandBrakeCLI.exe" -i "input" -t 1 -c 1 -o "output" -f mp4 —strict-anamorphic -e x264 -q 20 —vfr -a 1 -E faac -B 160 -6 dpl2 -R Auto -D 0 —gain=0 —audio-copy-mask none —audio-fallback ffac3 -x ref=1:weightp=1:subq=2:rc-lookahead=10:trellis=0:8x8dct=0 —verbose=1 And works like a charm. But not on linux

  Can you please give me a command to do this ? Also, if its possbile to use 2-3 core of server and 2-3 gb ram so the process would be faster.

  Thank you

• ffmpeg : add ui64 type to SpecifierOpt

  18 novembre 2017, par pkviet

  ffmpeg : add ui64 type to SpecifierOpt
   Adds ui64 (uint64_t) as a possible type for SpecifierOpt. This enables
  
   use of uint64_t options with SpecifierOpt such as channel_layout
  
   when expressed as a 64 bit channel mask.
  Signed-off-by : pkviet <pkv.stream@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] fftools/cmdutils.h