OpenCV VideoWriter sử dụng ffmpeg với "Không thể mở codec 'libx264'" Lỗi

Question

Tôi mới dùng OpenCV và tôi muốn viết hình ảnh Mat thành video bằng VideoWriter trên Ubuntu 12.04. Nhưng khi xây dựng VideoWriter, các lỗi xuất hiện.

Dường như OpenCV gọi API ffmpeg bằng các tham số mặc định và ffmpeg gọi x264 bằng các tham số mặc định của nó. Sau đó, các cài đặt này bị hỏng cho libx264. Vì vậy, lỗi "Không thể mở codec 'libx264'".

Bất kỳ ai cũng có ý tưởng để giải quyết vấn đề này?

Cụ thể hơn:

1. có ai biết ở đâu và như thế nào OpenCV gọi ffmpeg API?
2. làm thế nào để thay đổi cài đặt mặc định ffmpeg sử dụng mã, hopefull, có thể dễ dàng nhúng vào OpenCV?
3. các thay đổi mặc định trong ffmpeg sẽ được chuyển sang libx264?

Lỗi:

1. Uising CV_FOURCC('H', '2', '6', '4') 
[libx264 @ 0x255de40] broken ffmpeg default settings detected 
[libx264 @ 0x255de40] use an encoding preset (e.g. -vpre medium) 
[libx264 @ 0x255de40] preset usage: -vpre <speed> -vpre <profile> 
[libx264 @ 0x255de40] speed presets are listed in x264 --help 
[libx264 @ 0x255de40] profile is optional; x264 defaults to high 
Could not open codec 'libx264': Unspecified error 

2. Using FOURCC = -1 to invoke user customized codec 
OpenCV Error: Unsupported format or combination of formats (Gstreamer Opencv 
backend doesn't support this codec acutally.) in CvVideoWriter_GStreamer::open, 
file /home/XXX/Downloads/opencv-2.4.8/modules/highgui/src/cap_gstreamer.cpp, 
line 505 terminate called after throwing an instance of 'cv::Exception' 
what(): /home/XXX/Downloads/opencv-2.4.8/modules/highgui/src/cap_gstreamer.cpp: 
505: error: (-210) Gstreamer Opencv backend doesn't support this codec acutally. 
in function CvVideoWriter_GStreamer::open 

Codes:

int main(int argc, char *argv[]) 
{ 
    VideoWriter outputVideo; 
    bool fourcc_on = true; //switch on/off different error 
    if (fourcc_on) 
     outputVideo.open("outVideo.avi", CV_FOURCC('H', '2', '6', '4'), 25, Size(100, 100), true); 
    else 
     outputVideo.open("outVideo.avi", -1, 25, Size(100, 100), true); 

    if (!outputVideo.isOpened()) 
    { 
     cout << "Could not open the output video for write" << endl; 
     return -1; 
    } 
    return 0; 
} 

OpenCV Cấu hình:

-- Detected version of GNU GCC: 46 (406) 
-- Found OpenEXR: /usr/lib/libIlmImf.so 
-- Looking for linux/videodev.h 
-- Looking for linux/videodev.h - not found 
-- Looking for linux/videodev2.h 
-- Looking for linux/videodev2.h - found 
-- Looking for sys/videoio.h 
-- Looking for sys/videoio.h - not found 
-- Looking for libavformat/avformat.h 
-- Looking for libavformat/avformat.h - found 
-- Looking for ffmpeg/avformat.h 
-- Looking for ffmpeg/avformat.h - not found 
-- Could NOT find JNI (missing: JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH) 
-- 
-- General configuration for OpenCV 2.4.8 ===================================== 
-- Version control:    unknown 
-- 
-- Platform: 
--  Host:      Linux 3.8.0-38-generic x86_64 
--  CMake:      2.8.7 
--  CMake generator:    Unix Makefiles 
--  CMake build tool:   /usr/bin/make 
--  Configuration:    RELEASE 
-- 
-- C/C++: 
--  Built as dynamic libs?:  YES 
--  C++ Compiler:    /usr/bin/c++ (ver 4.6) 
--  C++ flags (Release):   -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -O3 -DNDEBUG -DNDEBUG 
--  C++ flags (Debug):   -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -g -O0 -DDEBUG -D_DEBUG 
--  C Compiler:     /usr/bin/gcc 
--  C flags (Release):   -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -O3 -DNDEBUG -DNDEBUG 
--  C flags (Debug):    -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -msse3 -ffunction-sections -g -O0 -DDEBUG -D_DEBUG 
--  Linker flags (Release):  
--  Linker flags (Debug):   
--  Precompiled headers:   YES 
-- 
-- OpenCV modules: 
--  To be built:     core flann imgproc highgui features2d calib3d ml video legacy objdetect photo gpu ocl nonfree contrib python stitching superres ts videostab 
--  Disabled:     world 
--  Disabled by dependency:  - 
--  Unavailable:     androidcamera dynamicuda java 
-- 
-- GUI: 
--  QT:       NO 
--  GTK+ 2.x:     YES (ver 2.24.10) 
--  GThread :     YES (ver 2.32.4) 
--  GtkGlExt:     NO 
--  OpenGL support:    NO 
-- 
-- Media I/O: 
--  ZLib:      /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.3.4) 
--  JPEG:      /usr/lib/x86_64-linux-gnu/libjpeg.so (ver) 
--  PNG:       /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.2.46) 
--  TIFF:      /usr/lib/x86_64-linux-gnu/libtiff.so (ver 42 - 3.9.5) 
--  JPEG 2000:     /usr/lib/x86_64-linux-gnu/libjasper.so (ver 1.900.1) 
--  OpenEXR:      /usr/lib/libImath.so /usr/lib/libIlmImf.so /usr/lib/libIex.so /usr/lib/libHalf.so /usr/lib/libIlmThread.so (ver 1.6.1) 
-- 
-- Video I/O: 
--  DC1394 1.x:     NO 
--  DC1394 2.x:     YES (ver 2.2.0) 
--  FFMPEG:      YES 
--  codec:      YES (ver 55.58.105) 
--  format:     YES (ver 55.37.101) 
--  util:      YES (ver 52.78.100) 
--  swscale:     YES (ver 2.6.100) 
--  gentoo-style:    YES 
--  GStreamer:     
--  base:      YES (ver 0.10.36) 
--  app:      YES (ver 0.10.36) 
--  video:      YES (ver 0.10.36) 
--  OpenNI:      NO 
--  OpenNI PrimeSensor Modules: NO 
--  PvAPI:      NO 
--  GigEVisionSDK:    NO 
--  UniCap:      NO 
--  UniCap ucil:     NO 
--  V4L/V4L2:     Using libv4l (ver 1.0.1) 
--  XIMEA:      NO 
--  Xine:      NO 
-- 
-- Other third-party libraries: 
--  Use IPP:      NO 
--  Use Eigen:     NO 
--  Use TBB:      NO 
--  Use OpenMP:     NO 
--  Use GCD      NO 
--  Use Concurrency    NO 
--  Use C=:      NO 
--  Use Cuda:     NO 
--  Use OpenCL:     YES 
-- 
-- OpenCL: 
--  Version:      dynamic 
--  Include path:    /home/shixudongleo/Downloads/opencv-2.4.8/3rdparty/include/opencl/1.2 
--  Use AMD FFT:     NO 
--  Use AMD BLAS:    NO 
-- 
-- Python: 
--  Interpreter:     /usr/bin/python (ver 2.7.3) 
--  Libraries:     /usr/lib/libpython2.7.so 
--  numpy:      /usr/lib/python2.7/dist-packages/numpy/core/include (ver 1.6.1) 
--  packages path:    lib/python2.7/dist-packages 
-- 
-- Java: 
--  ant:       NO 
--  JNI:       NO 
--  Java tests:     NO 
-- 
-- Documentation: 
--  Build Documentation:   NO 
--  Sphinx:      NO 
--  PdfLaTeX compiler:   /usr/bin/pdflatex 
-- 
-- Tests and samples: 
--  Tests:      YES 
--  Performance tests:   YES 
--  C/C++ Examples:    NO 
-- 
-- Install path:     /usr/local 
-- 
-- cvconfig.h is in:    /home/shixudongleo/Downloads/opencv-2.4.8/build 
-- ----------------------------------------------------------------- 
-- 
-- Configuring done 
-- Generating done 
-- Build files have been written to: /home/XXX/Downloads/opencv-2.4.8/build 

FFMPEG

ffmpeg được bật để hỗ trợ OpenCV và libx264 được bật khi biên dịch ffmpeg. Bằng cách sử dụng dòng lệnh ffmpeg, libx264 đang chạy bình thường.

$ ffmpeg -i test.avi -vcodec libx264 test.mp4 
ffmpeg -i test.avi -vcodec libx264 test.mp4 > ~/Downloads/ffmpeg_log.txt 
ffmpeg version 2.2.git Copyright (c) 2000-2014 the FFmpeg developers 
    built on Apr 24 2014 16:39:51 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5) 
    configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-nonfree --enable-postproc --enable-version3 --enable-x11grab --enable-shared --enable-pic 
    libavutil  52. 78.100/52. 78.100 
    libavcodec  55. 58.105/55. 58.105 
    libavformat 55. 37.101/55. 37.101 
    libavdevice 55. 13.100/55. 13.100 
    libavfilter  4. 4.100/4. 4.100 
    libswscale  2. 6.100/2. 6.100 
    libswresample 0. 18.100/0. 18.100 
    libpostproc 52. 3.100/52. 3.100 
Input #0, avi, from 'test.avi': 
    Duration: 00:00:03.73, start: 0.000000, bitrate: 1757 kb/s 
    Stream #0:0: Video: msvideo1 (CRAM/0x4D415243), rgb555le, 320x240, 1781 kb/s, 15 tbr, 15 tbn, 15 tbc 
    Metadata: 
     title   : julius.avi Video #1 
File 'test.mp4' already exists. Overwrite ? [y/N] y 
No pixel format specified, yuv444p for H.264 encoding chosen. 
Use -pix_fmt yuv420p for compatibility with outdated media players. 
[libx264 @ 0x25d08e0] using cpu capabilities: none! 
[libx264 @ 0x25d08e0] profile High 4:4:4 Predictive, level 1.2, 4:4:4 8-bit 
[libx264 @ 0x25d08e0] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=12 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=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=15 scenecut=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, mp4, to 'test.mp4': 
    Metadata: 
    encoder   : Lavf55.37.101 
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0]/0x0021), yuv444p, 320x240, q=-1--1, 15360 tbn, 15 tbc 
    Metadata: 
     title   : julius.avi Video #1 
Stream mapping: 
    Stream #0:0 -> #0:0 (msvideo1 -> libx264) 
Press [q] to stop, [?] for help 
frame= 56 fps=0.0 q=-1.0 Lsize=  321kB time=00:00:03.60 bitrate= 731.0kbits/s  
video:320kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.409949% 
[libx264 @ 0x25d08e0] frame I:3  Avg QP:15.36 size: 7975 
[libx264 @ 0x25d08e0] frame P:38 Avg QP:26.05 size: 6230 
[libx264 @ 0x25d08e0] frame B:15 Avg QP:28.25 size: 4418 
[libx264 @ 0x25d08e0] consecutive B-frames: 46.4% 53.6% 0.0% 0.0% 
[libx264 @ 0x25d08e0] mb I I16..4: 1.4% 72.8% 25.8% 
[libx264 @ 0x25d08e0] mb P I16..4: 1.6% 5.7% 15.1% P16..4: 7.6% 6.3% 7.4% 0.0% 0.0% skip:56.3% 
[libx264 @ 0x25d08e0] mb B I16..4: 0.2% 1.0% 2.0% B16..8: 13.3% 7.8% 8.7% direct: 8.3% skip:58.8% L0:34.9% L1:36.6% BI:28.5% 
[libx264 @ 0x25d08e0] 8x8 transform intra:37.7% inter:2.3% 
[libx264 @ 0x25d08e0] coded y,u,v intra: 52.1% 42.1% 30.1% inter: 19.6% 9.2% 5.2% 
[libx264 @ 0x25d08e0] i16 v,h,dc,p: 56% 17% 24% 2% 
[libx264 @ 0x25d08e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 10% 16% 68% 1% 1% 1% 1% 1% 1% 
[libx264 @ 0x25d08e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 18% 28% 5% 6% 5% 7% 5% 6% 
[libx264 @ 0x25d08e0] Weighted P-Frames: Y:31.6% UV:21.1% 
[libx264 @ 0x25d08e0] ref P L0: 70.5% 9.0% 12.1% 6.5% 2.0% 
[libx264 @ 0x25d08e0] ref B L0: 91.3% 8.7% 
[libx264 @ 0x25d08e0] kb/s:700.56 

Answer 1

Bạn đã thử thay đổi thông số bốncc chưa?

VideoWriter outp; 
outp.open("aboutput.wmv",CV_FOURCC('M','P','4','2'),10,Size(160,160),false); 

này hoạt động trên Ubuntu 14.04 của tôi