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• How to rotate video that comes from android device with same quality by using ffmpeg [migrated]

  11 décembre 2014, par Gaurav Bansal

  I want to rotate video that comes from android device that always display in landscape form ; so how we convert into portrait form with a same quality.
  I am using these code but unable to find exact code.

  $ ffmpeg -i $inputfile -vf "transpose=1" $outputfile
  
  $ ffmpeg -i $inputfile -acodec copy -vcodec copy -vf transpose=1 $outputfile

  Not worked for me...

• Ffmpeg 2 mp4 combining

  17 novembre 2014, par Fatih Uçar

  class Program
  
  {
  
      static void Main(string[] args)
  
      {
  
          ProcessStartInfo startInfo = new ProcessStartInfo(@"C:\ffmpeg\bin\ffmpeg.exe");
  
          Process.Start(startInfo);//ffmpeg open and close
  
          startInfo = new ProcessStartInfo(@"C:\ffmpeg\bin\ffmpeg.exe", @"cat C:\1.mp4 C:\2.mp4 | ffmpeg -f mpeg -i - -vcodec copy -acodec copy C:\merged.mp4");
  
          //this close:( 
  
  
  
      }
  
  }

  2mp4 combining for windows form application ?

  2 things I want to combine video
  All I want to combine 2 mp4

• Decoding H.264 stream from dvr

  17 octobre 2013, par Andrew S

  I have a security DVR that uses h264 streams. I have been trying to get this to work with zoneminder. I have successfully logged into the dvr and recieved some form of data streams. The data stream is dumped to a fifo/pipe, and then zoneminder uses ffmpeg to read this in.

  Note : i know very very little about h.264 streams. just enough to be stupid.

  The video only updates about every 15 seconds in ZM. I can dump the stream to a file with ffmpeg or avconv (avconv -i /tmp/mypipe cam.mp4) but it is still not right. However, the file created by avconv is WAY WAY better than the one created by ffmpeg.

  I've included a link to the wireshark dump (I did change the PW and login info, etc...). From the data, It appears that the dvr is adding a header to the h264 data streams. I understand that the h264 stream starts with a (0x00 00 01 67) or (0x00 00 01 61). Here is an example of the header plus start of stream :

  0x33, 0x30, 0x64, 0x63, 0x48, 0x32, 0x36, 0x34, 
  
  0x3f, 0x55, 0x00, 0x00, 0x08, 0x00, 0x20, 0x00, 
  
  0xa2, 0x7a, 0xea, 0xdc, 0xcf, 0x08, 0x00, 0x00, 
  
  0x0d, 0x0a, 0x11, 0x07, 0x13, 0x20, 0x00, 0x00, 
  
  0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0xe0, 0x14, 
  
  0xdb, 0x05, 0x87, 0xc4, 0x00, 0x00, 0x00, 0x01, 
  
  0x68, 0xce, 0x30, 0xa4, 0x80, 0x00, 0x00, 0x00, 
  
  0x01, 0x06, 0xe5, 0x01, 0x51, 0x80, 0x00, 0x00, 
  
  0x00, 0x01, 0x65, 0xb8, 0x00, 0x01, 0xa8, 0xac,

  I can see that there are a few frame indicators in this message. The DVR's header appears to be 32 bytes long in this case, and in some other messages in the dump, it appears to be 24 bytes long. I am striping the header off before I dump the stream to the pipe. (I have verified the output doesn't include the dvr's headers in any way.

  What I would like help with is determining what I should be sending to the pipe. should I start with the first h.264 key ? Is there something out of order ? I'm very surprised that ffmpeg is only getting 15 second updates, but avconv is much better (lots of dropped frames, and playback is "sped up".

  using ffmpeg to read the pipe produces a file that shows it's codec as : H264 - MPEG-4 AVC (part 10) (avc1) with a Decoded format : Planar 4:2:0 YUV using vlc.

  Appreciate any help you can provide !

  Wireshark h264 dump

  edit : on Ubuntu 13.04
  ffmpeg version : 6:0.8.6-1ubuntu2
  avconv 0.8.6-6:0.8.6-1ubuntu2