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• fish eye dewarping on client application side [on hold]

  30 décembre 2015, par user1235389

  I am working on an android application which need to handle dewarping of Fish eye images from camera.

  I have to use FFMPEG library for decoding and getting the images . Then i need to process the distorted images and dewarp it at client side.

  I am totally new into this . I know we can use OpenCV fisheyeUndistort method

  Can anyone help me :

  1. How to use opencv ( as a jar or a library file in android app )

  2. I am confused about how the flow or component diagram looks like...if i use ffmpeg library, do i need to see it as :

     Camera — fish eye image — scalar — ffmpeg library decoding--- opencv (for dewarp) — application show .

  I dont know the flow ..can you let me know if my understanding is wrong.

• Configure ffmpeg to work with native client

  11 juin 2016, par Mohammad Abu Musa

  I followed the steps https://chromium.googlesource.com/webports/+/master to port ffmpeg to native client. I do not know what is the issue here. here are the configuration and here what I get

  NACL_ARCH=pnacl TOOLCHAIN=pnacl make ffmpeg

  Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in m/\@anchor{ <-- HERE (?:[^\}]*)\}/ at /home/user/Desktop/webports/src/out/build/ffmpeg/ffmpeg-2.6.1/doc/texi2pod.pl line 387.
MAN doc/ffmpeg.1
MAN doc/ffprobe.1
MAN doc/ffmpeg-all.1
MAN doc/ffprobe-all.1
LD  ffmpeg_g
LD  ffprobe_g
/home/user/Desktop/webports/src/out/build/ffmpeg/ffmpeg-2.6.1/Makefile:124: recipe for target 'ffprobe_g' failed
make[1]: *** [ffprobe_g] Error 247
make[1]: *** Waiting for unfinished jobs....
/home/user/Desktop/webports/src/out/build/ffmpeg/ffmpeg-2.6.1/Makefile:124: recipe for target 'ffmpeg_g' failed
make[1]: *** [ffmpeg_g] Error 247
make[1]: Leaving directory '/home/user/Desktop/webports/src/out/build/ffmpeg/build_pnacl'
webports: Build failed: 'ffmpeg' [pnacl/release]
Makefile:89: recipe for target 'ffmpeg' failed
make: *** [ffmpeg] Error 1

• Is there a MS-DRM client library for linux ?

  19 juin 2016, par qrtt1

  I have used the libraries (libavformat and libavcodec) to decode some MMS streaming urls. But some of them are protected by DRM. When I try to decode them, the library will warn about it

  In libavformat/asfdec.c :

  if (!s->keylen) {
  
      if (!guidcmp(&g, &ff_asf_content_encryption)) {
  
          av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
  
      } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
  
          av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
  
      } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
  
          av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
  
      }
  
  }

  The variable s is the struct AVFormatContext. My question is where to get the key ? It seems to decode it with a DRM key.

  ---

  I look the ASF Spec, and try to patch asfdec.c. Now, I have the acquiring license URL and key id. The problem can rewrite as ’Is there a MS-DRM client library for linux ?’ (old : How to decode a MMS streaming url with DRM by ffmpeg ?)

  Is it possible to use the license url and key id to get content key ?