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• Using ffmpeg for stream encryption by srtp in windows

  11 avril 2015, par user3248865

  I have been trying to make encrypted stream via ffmpeg and I´ve found srtp support in this library (ffmpeg documentation). Unfortunately, it seems that encryption doesn´t work at all. I´m using the following command to send stream :

  ffmpeg -re -i "output.mpg" -vcodec libx264 -f flv "srtp://192.168.0.100:7777?srtp_out_suite=AES_CM_128_HMAC_SHA1_80&srtp_out_params=00108310518720928b30d38f41149351559761969b71d79f8218a39259a7"

  and this one for stream receiving :

  ffplay "srtp://192.168.0.100:7777?srtp_in_suite=AES_CM_128_HMAC_SHA1_80&srtp_in_params=00108310518720928b30d38f41149351559761969b71d79f8218a39259a7"

  They work good.
  But, If I change the command for ffplay to this one :

  ffplay udp://192.168.0.100:7777

  it works too and I can watch the video. So, it means that encryption for srtp doesn´t work ?

  1. Is the stream encryption by using ffmpeg possible (not only srtp) ?
  2. If so, What am I doing wrong ?

  Thanks in advance.

  An output from ffmpeg -re -i ... command is :

  Input #0, mpeg, from 'outpu.mpg':
  
  Duration: 00:03:20.01, start: 0.529089, bitrate: 475 kb/s
  
  Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p(tv), 352x288 [SAR 1:1 DAR 11:
  
  9], 104857 kb/s, 25 fps, 25 tbr, 90k tbn, 25 tbc
  
  Stream #0:1[0x1c0]: Audio: mp2, 44100 Hz, stereo, s16p, 64 kb/s
  
  [libx264 @ 023633e0] using SAR=1/1
  
  [libx264 @ 023633e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 023633e0] profile High, level 1.3
  
  [libx264 @ 023633e0] 264 - core 138 r2358 9e941d1 - H.264/MPEG-4 AVC codec - Cop
  
  yleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deb
  
  lock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 m
  
  e_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chro
  
  ma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 i
  
  nterlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1
  
  b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenec
  
  ut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=
  
  0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, flv, to 'srtp://192.168.0.106:7777?srtp_out_suite=AES_CM_128_HMAC_SHA
  
  1_80&srtp_out_params=00108310518720928b30d38f41149351559761969b71d79f8218a39259a
  
  7':
  
    Metadata:
  
      encoder         : Lavf55.19.100
  
     Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 352x288
  
  [SAR 1:1 DAR 11:9], q=-1--1, 1k tbn, 25 tbc
  
     Stream #0:1: Audio: mp3 (libmp3lame) ([2][0][0][0] / 0x0002), 44100 Hz, ster
  
     eo, s16p
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg1video -> libx264)
  
    Stream #0:1 -> #0:1 (mp2 -> libmp3lame)
  
  Press [q] to stop, [?] for help
  
  frame=   14 fps=0.0 q=0.0 size=       0kB time=00:00:00.13 bitrate=  23.2kbits/s
  
  frame=   27 fps= 27 q=0.0 size=       0kB time=00:00:00.65 bitrate=   4.7kbits/s
  
  frame=   40 fps= 26 q=0.0 size=       0kB time=00:00:01.15 bitrate=   2.7kbits/s
  
  frame=   52 fps= 26 q=28.0 size=       3kB time=00:00:01.67 bitrate=  16.8kbits/
  
  ...

  Edit :

  I have tried the above ffmpeg command with srtp_out_suite=NmcxMmQ2ZjVnYjEyNmRmMTV2czY1YWR2ZjFhc2Rm, but udp stream is still playing well.

• Creating debug build FFMpeg static libraries with Windows compiler

  6 juillet 2015, par LostBoy

  We are using the FFMpeg static libraries compiled via the —toolchain=msvc switch with the VS2010 compiler linked to the static runtime (-MT). These libraries work fine but they are linked to libcmt.lib.

  We would like to compile a debug build of these libraries (i.e. linking against libcmtd.lib). In the configure call I added :

  ./configure --toolchain=msvc --enable-debug --arch=x86 --extra-cflags=-MTd

  This will result in some calls to cl.exe with the -MTd switch but also some with the -MT switch and cause conflicts in the linker stage.

  What am I missing ?

• ffmpeg Frames to mp4 (Windows)

  8 juillet 2015, par Somax

  I am trying to combine my frames to a video now for like an hour and I have huge problems with ffmpeg. It keeps on telling me that the directory doesnt exist and i have no idea how to make it right...

  ffmpeg is in C :/ffmpeg
  the frames are in C/ffmpeg/render
  they are named : output_0001.png to output_0150.png

  I want to have 24 Frames per secound.
  what do i have to do in the cmd ?

  i tryed like "ffmpeg -r 30 -i c :/ffmpeg/render/output_%24.png video.mp4"

  What am i doing wrong ?