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• OpenCV 2.4.7 with FFMpeg support build with VS 2010 (x86)

  24 novembre 2013, par GregPhil

  I'm fighting with new version of OpenCV 2.4.7 for almost one week (prev. used 2.4.2). My motivation for the new setup is the fact that I run into problems using the Videowriter for uncompressed grayscale videos (http://answers.opencv.org/question/3603/videowriter-videocapture-and-uncompressed-avi/). In https://github.com/Itseez/opencv/pull/1516 "akarsakov" is recommending to build OpenCV without vfw support and open uncompressed video through ffmpeg. That's what I tried to do. I followed basically the instructions mentioned in this video : http://docs.opencv.org/trunk/doc/tutorials/introduction/windows_install/windows_install.html

  I had successfully build opencv with Qt 5.1.1 (http://answers.opencv.org/question/24184/how-to-compile-opencv-247-with-qt-and-ffmpeg/). But I'm not able to get the VideoWriter & VideoCapture work for me. So what I did :

  1. I downloaded the newest ffmpeg build from http://ffmpeg.zeranoe.com/builds/

  2. I generated the vs2010 project disabling VfW and enabling ffmpeg instead :

     Video I/O:
     
     
     
     Video for Windows:           NO
     
     DC1394 1.x:                  NO
     
     DC1394 2.x:                  NO
     
     FFMPEG:                      YES (prebuilt binaries)
     
       codec:                     YES (ver 55.18.102)
     
       format:                    YES (ver 55.12.100)
     
       util:                      YES (ver 52.38.100)
     
       swscale:                   YES (ver 2.3.100)
     
       gentoo-style:              YES
     
       OpenNI:                    NO
     
     OpenNI PrimeSensor Modules:  NO
     
     PvAPI:                       NO
     
     GigEVisionSDK:               NO
     
     DirectShow:                  YES
     
     Media Foundation:            NO
     
     XIMEA:                       NO

  3. I added the include directories and libs for ffmpeg to the highgui module.

  I was not able to compile OpenCV without any errors but the behaviour what I see is not what I expect :

  1. Build OpenCV 2.4.7 without VfW -> VideoWriter.open () returns always false !
  2. Build OpenCV 2.4.7 with VfW -> VideoWriter.open () returns true for the time, calling a release() and an open() on the same object returns always a false.
  3. With or without ffmpeg -> An VideoCapture.open () gives a error message asking for libiconv-2dll !

  Does some had the same problems and is able to point me to my mistake ?

  Thank you in advance.
  cheers

• Revision dd5510750a : third_party/libwebm : pull from upstream. Upstream hash : a58c32339e06e5d672a58cd

  10 septembre 2015, par Vignesh Venkatasubramanian

  Changed Paths :
   Modify /examples.mk

  
   Modify /third_party/libwebm/README.libvpx

  
   Modify /third_party/libwebm/mkvmuxer.hpp

  
   Modify /third_party/libwebm/mkvparser.cpp

  
   Modify /third_party/libwebm/mkvparser.hpp

  
   Modify /third_party/libwebm/webmids.hpp

  
  
  third_party/libwebm : pull from upstream.

  Upstream hash : a58c32339e06e5d672a58cdd5844cea0a661e735

  Changes from upstream since last update :
  a58c323 mkvmuxer : Add codec id constant for VP10.
  714f3c4 mkvparser : validate results in EBMLHeader::Parse.
  cec98d4 mkvparser : Correct the ReadID implementation.
  eb36ae4 Merge changes I029a268e,Ia272b150,I5c4d1bbc,Ia47a2478,I3a2e2226
  229f493 Merge "mkvparser : Segment::AppendCluster asserts to error checks."
  287faf9 Merge "mkvparser : Segment::DoLoadClusterUnknownSize asserts to error
  checks."
  1a87b59 Merge "mkvparser : Segment assert clean up."
  d26ec69 mkvparser : Cluster::Parse clean up.
  f2029be mkvparser : Disallow EBML IDs equal to 0.
  19f5694 mkvparser : Cluster::Load clean up.
  27a07c1 mkvparser : Segment::Load asserts to error checks.
  d0313dd mkvparser : Segment::PreloadCluster asserts to error checks.
  b108695 mkvparser : Segment::AppendCluster asserts to error checks.
  4630f80 mkvparser : Segment::DoLoadClusterUnknownSize asserts to error checks.
  841a9b5 mkvparser : Segment assert clean up.
  8c4ca2e Merge "mkvparser : Make mkvparser namespace usage uniform."
  49ae6f0 Merge "mkvparser : Fix include order."
  0735bb5 mkvparser : Make mkvparser namespace usage uniform.
  93b24c4 mkvparser : Fix include order.
  a57d660 sample_muxer : fix Segment memory leak on error
  1c5bd94 mkvparser : Cues, change asserts to error checks.
  7f77201 Merge "mkvparser : Add ReadID."
  795fd56 mkvparser : set kMaxAllocSize explicitly
  23bb18b mkvparser : Add ReadID.
  7b57e37 mkvparser : add SafeArrayAlloc.
  83a1f68 mkvparser : Remove buf_t typedef.
  5074714 Merge changes Ia1265a63,I799d54df,Icfc582e4,I3425f608
  b181105 Merge changes Ie4318152,I1e65f30f
  06b4337 Block::Parse : replace pos asserts w/checks
  b366a98 Cluster::ParseBlockGroup : replace pos asserts w/checks
  2857b23 Tags: :*::Parse : replace pos asserts w/checks
  f1b2cfa Chapters: :*::Parse : replace pos asserts w/checks
  ca80629 Merge "mkvparser : Cues::PreloadCuePoint now returns bool."
  6b4b297 Block::Parse : use int64 to aggregate laced frame sizes
  c0d2c98 UnserializeFloat : check result for Inf/NaN
  1a6dc4f mkvparser : Cues::PreloadCuePoint now returns bool.
  275ac22 mkvparser : Cluster::Create clean up.
  064f2ee Segment::PreloadCluster() : return a bool status
  3778408 Segment::AppendCluster() : return a bool status
  e86d046 mkvparser : check Cluster::Create() return
  f9885b5 mkvparser : check allocations
  21ee398 mkvparser : Segment::Load fail w/missing info/tracks
  08fb654 Merge changes I264e68b2,Ife6190a4,Ibf37245f,I06efadb5,I88b5dfec, ...
  c896095 mkvparser/Cluster : convert asserts to failure returns
  680b4bf mkvparser/Tracks : convert asserts to failure returns
  5889e6c mkvparser/Track : convert asserts to failure returns
  5135c4c mkvparser/ContentEncoding : convert asserts to failure returns
  b0e4f32 mkvparser/Cues : convert asserts to failure returns
  13ccc7f mkvparser/UnserializeInt : fix sign flip
  db3f9bb mkvparser/SeekHead : convert asserts to failure returns
  8de3654 mkvparser/Segment : convert asserts to failure returns
  fa2aa7d SeekHead::Parse() : fix assertion failure
  d9bdade sample,_muxer : check SegmentInfo::GetInfo() return
  07a9cf7 Merge "mkvparser : Remove some asserts."
  c56ee29 mkvparser : Remove some asserts.
  d901324 Merge "mkvparser : Remove some asserts from SegmentInfo::Parse."
  7f7d898 Fix case sensitivity issue in iosbuild.sh.
  42fe2cd mkvparser : Remove some asserts from SegmentInfo::Parse.
  8bccd9c Merge "mkvparser : avoid rollover in UnserializeInt()."
  7a2fa0d mkvparser : avoid rollover in UnserializeInt().
  44f5ce6 mkvparser : Disallow durations in seconds greater than LONG_LONG_MAX.
  b521e30 Merge "mkvparser : Segment::ParseHeaders() avoid rollover and bad int
  sizes."
  7680e2a mkvparser : Check for errors in Match().
  39a315f mkvparser : Segment::ParseHeaders() avoid rollover and bad int sizes.
  f250ace mkvparser : Handle invalid lengths and rollover in ParseElementHeader().
  cd96a76 mkvparser : Avoid rollover/truncation in UnserializeString().
  8e8b3db Merge "mkvparser : Add error checking in Block::Parse."
  82b7e5f sample : correct mbstowcs() error check
  04d7809 sample : check allocation return
  986b64b mkvparser : Add error checking in Block::Parse.

  Change-Id : I39beef84962d6341f8ce53be06807b3e2068f777

• FFmpeg Subtitles - New Line \n Break

  30 avril 2021, par John Doe

  I am trying to find a way to add line breaks (returns) to my subtitles in ffmpeg, but so far coming up with nothing. If I add \n to the subtitle text it just doesn't show it. Here's my video filter :

  


  subtitles=thumb.srt:force_style='FontName=Lilita One,Fontsize=60,Outline=8'


  


  Any ideas ?