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Supporting all media types
13 avril 2011, parUnlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)
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Contribute to documentation
13 avril 2011Documentation is vital to the development of improved technical capabilities.
MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
To contribute, register to the project users’ mailing (...) -
Selection of projects using MediaSPIP
2 mai 2011, parThe examples below are representative elements of MediaSPIP specific uses for specific projects.
MediaSPIP farm @ Infini
The non profit organizationInfini develops hospitality activities, internet access point, training, realizing innovative projects in the field of information and communication technologies and Communication, and hosting of websites. It plays a unique and prominent role in the Brest (France) area, at the national level, among the half-dozen such association. Its members (...)
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trying to make OpenCV 3.2.0 work with virtualenv
24 juillet 2017, par lollercoasterI’m on Ubuntu 16.04 with Python 2.7 and virtualenv & virtualenvwrapper.
By following this guide I managed to get the following script working with my system Python2.7 which has
cv2globally installed.I used this script to install it :
######################################
# INSTALL OPENCV ON UBUNTU OR DEBIAN #
######################################
# | THIS SCRIPT IS TESTED CORRECTLY ON |
# |----------------------------------------------------|
# | OS | OpenCV | Test | Last test |
# |----------------|--------------|------|-------------|
# | Ubuntu 16.04.2 | OpenCV 3.2.0 | OK | 20 May 2017 |
# | Debian 8.8 | OpenCV 3.2.0 | OK | 20 May 2017 |
# | Debian 9.0 | OpenCV 3.2.0 | OK | 25 Jun 2017 |
# 1. KEEP UBUNTU OR DEBIAN UP TO DATE
sudo apt-get -y update
sudo apt-get -y upgrade
sudo apt-get -y dist-upgrade
sudo apt-get -y autoremove
# 2. INSTALL THE DEPENDENCIES
# Build tools:
sudo apt-get install -y build-essential cmake
# GUI (if you want to use GTK instead of Qt, replace 'qt5-default' with 'libgtkglext1-dev' and remove '-DWITH_QT=ON' option in CMake):
sudo apt-get install -y qt5-default libvtk6-dev
# Media I/O:
sudo apt-get install -y zlib1g-dev libjpeg-dev libwebp-dev libpng-dev libtiff5-dev libjasper-dev libopenexr-dev libgdal-dev
# Video I/O:
sudo apt-get install -y libdc1394-22-dev libavcodec-dev libavformat-dev libswscale-dev libtheora-dev libvorbis-dev libxvidcore-dev libx264-dev yasm libopencore-amrnb-dev libopencore-amrwb-dev libv4l-dev libxine2-dev
# Parallelism and linear algebra libraries:
sudo apt-get install -y libtbb-dev libeigen3-dev
# Python:
sudo apt-get install -y python-dev python-tk python-numpy python3-dev python3-tk python3-numpy
# Documentation:
sudo apt-get install -y doxygen
# UI stuff
sudo apt-get install libgtk-3-dev libatlas-base-dev gfortran
# 3. INSTALL THE LIBRARY (YOU CAN CHANGE '3.2.0' FOR THE LAST STABLE VERSION)
sudo apt-get install -y unzip wget
# opencv contrib
wget https://github.com/opencv/opencv_contrib/archive/3.2.0.zip -O opencv_contrib-3.2.0.zip
unzip opencv_contrib-3.2.0.zip
rm opencv_contrib-3.2.0.zip
# opencv
wget https://github.com/opencv/opencv/archive/3.2.0.zip
unzip 3.2.0.zip
rm 3.2.0.zip
mv opencv-3.2.0 OpenCV-3.2.0
cd OpenCV-3.2.0
mkdir build
cd build
cmake -D WITH_QT=ON \
-D WITH_OPENGL=ON \
-D FORCE_VTK=ON \
-D WITH_TBB=ON \
-D WITH_GDAL=ON \
-D WITH_XINE=ON \
-D BUILD_EXAMPLES=ON \
-D INSTALL_PYTHON_EXAMPLES=ON \
-D ENABLE_PRECOMPILED_HEADERS=OFF \
-D BUILD_NEW_PYTHON_SUPPORT=ON \
..
make -j4
sudo make install
sudo ldconfig
# 4. EXECUTE SOME OPENCV EXAMPLES AND COMPILE A DEMONSTRATION
# To complete this step, please visit 'http://milq.github.io/install-opencv-ubuntu-debian'.The following script below works great with that system-wide installation :
import cv2
img = cv2.imread('some_img.jpg')Though this one doesn’t - even the system Python can’t read videos for some reason...
import cv2
video_capture = cv2.VideoCapture(0)
ret, frame = video_capture.read()
print ret # always Falsebut I want it to work with my virtualenv. So I recompiled OpenCV with :
cmake -D WITH_QT=ON \
-D WITH_OPENGL=ON \
-D FORCE_VTK=ON \
-D WITH_TBB=ON \
-D WITH_GDAL=ON \
-D WITH_XINE=ON \
-D BUILD_EXAMPLES=ON \
-D INSTALL_PYTHON_EXAMPLES=ON \
-D ENABLE_PRECOMPILED_HEADERS=OFF \
-D BUILD_NEW_PYTHON_SUPPORT=ON \
-D OPENCV_EXTRA_MODULES_PATH=/home/me/code/myproject/opencv_contrib-3.2.0/modules \
-D PYTHON_EXECUTABLE=~/.envs/myenv/bin/python \
..
make -j4
sudo make install
sudo ldconfigHere’s the CMake log :
-- Found VTK ver. 6.2.0 (usefile: /usr/lib/cmake/vtk-6.2/UseVTK.cmake)
-- Caffe: NO
-- Protobuf: YES
-- Glog: NO
-- freetype2: YES
-- harfbuzz: YES
-- Module opencv_sfm disabled because the following dependencies are not found: Glog/Gflags
-- freetype2: YES
-- harfbuzz: YES
-- Checking for modules 'tesseract;lept'
-- No package 'tesseract' found
-- No package 'lept' found
-- Tesseract: NO
-- Check contents of vgg_generated_48.i ...
-- Check contents of vgg_generated_64.i ...
-- Check contents of vgg_generated_80.i ...
-- Check contents of vgg_generated_120.i ...
-- Check contents of boostdesc_bgm.i ...
-- Check contents of boostdesc_bgm_bi.i ...
-- Check contents of boostdesc_bgm_hd.i ...
-- Check contents of boostdesc_binboost_064.i ...
-- Check contents of boostdesc_binboost_128.i ...
-- Check contents of boostdesc_binboost_256.i ...
-- Check contents of boostdesc_lbgm.i ...
--
-- General configuration for OpenCV 3.2.0 =====================================
-- Version control: 817bd7b-dirty
--
-- Extra modules:
-- Location (extra): /home/me/code/myproject/opencv_contrib-3.2.0/modules
-- Version control (extra): 817bd7b-dirty
--
-- Platform:
-- Timestamp: 2017-07-20T18:25:26Z
-- Host: Linux 4.8.0-58-generic x86_64
-- CMake: 3.5.1
-- 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 5.4.0)
-- C++ flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -ffunction-sections -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG
-- C++ flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -ffunction-sections -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG
-- C Compiler: /usr/bin/cc
-- C flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wno-narrowing -Wno-comment -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -ffunction-sections -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG
-- C flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wno-narrowing -Wno-comment -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -msse -msse2 -mno-avx -msse3 -mno-ssse3 -mno-sse4.1 -mno-sse4.2 -ffunction-sections -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG
-- Linker flags (Release):
-- Linker flags (Debug):
-- ccache: NO
-- Precompiled headers: NO
-- Extra dependencies: Qt5::Test Qt5::Concurrent Qt5::OpenGL /usr/lib/x86_64-linux-gnu/libwebp.so /usr/lib/x86_64-linux-gnu/libjasper.so /usr/lib/x86_64-linux-gnu/libImath.so /usr/lib/x86_64-linux-gnu/libIlmImf.so /usr/lib/x86_64-linux-gnu/libIex.so /usr/lib/x86_64-linux-gnu/libHalf.so /usr/lib/x86_64-linux-gnu/libIlmThread.so /usr/lib/libgdal.so dc1394 xine avcodec-ffmpeg avformat-ffmpeg avutil-ffmpeg swscale-ffmpeg Qt5::Core Qt5::Gui Qt5::Widgets /usr/lib/x86_64-linux-gnu/hdf5/serial/lib/libhdf5.so /usr/lib/x86_64-linux-gnu/libpthread.so /usr/lib/x86_64-linux-gnu/libsz.so /usr/lib/x86_64-linux-gnu/libdl.so /usr/lib/x86_64-linux-gnu/libm.so vtkRenderingOpenGL vtkImagingHybrid vtkIOImage vtkCommonDataModel vtkCommonMath vtkCommonCore vtksys vtkCommonMisc vtkCommonSystem vtkCommonTransforms vtkCommonExecutionModel vtkDICOMParser vtkIOCore /usr/lib/x86_64-linux-gnu/libz.so vtkmetaio /usr/lib/x86_64-linux-gnu/libjpeg.so /usr/lib/x86_64-linux-gnu/libpng.so /usr/lib/x86_64-linux-gnu/libtiff.so vtkImagingCore vtkRenderingCore vtkCommonColor vtkFiltersExtraction vtkFiltersCore vtkFiltersGeneral vtkCommonComputationalGeometry vtkFiltersStatistics vtkImagingFourier vtkalglib vtkFiltersGeometry vtkFiltersSources vtkInteractionStyle vtkRenderingLOD vtkFiltersModeling vtkIOPLY vtkIOGeometry /usr/lib/x86_64-linux-gnu/libjsoncpp.so vtkFiltersTexture vtkRenderingFreeType /usr/lib/x86_64-linux-gnu/libfreetype.so vtkftgl vtkIOExport vtkRenderingAnnotation vtkImagingColor vtkRenderingContext2D vtkRenderingGL2PS vtkRenderingContextOpenGL /usr/lib/libgl2ps.so vtkRenderingLabel dl m pthread rt /usr/lib/x86_64-linux-gnu/libGLU.so /usr/lib/x86_64-linux-gnu/libGL.so tbb
-- 3rdparty dependencies: libprotobuf
--
-- OpenCV modules:
-- To be built: core flann hdf imgproc ml photo reg surface_matching video viz dnn freetype fuzzy imgcodecs shape videoio highgui objdetect plot superres ts xobjdetect xphoto bgsegm bioinspired dpm face features2d line_descriptor saliency text calib3d ccalib cvv datasets rgbd stereo tracking videostab xfeatures2d ximgproc aruco optflow phase_unwrapping stitching structured_light java python2 python3
-- Disabled: world contrib_world
-- Disabled by dependency: -
-- Unavailable: cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev cnn_3dobj matlab sfm
--
-- GUI:
-- QT 5.x: YES (ver 5.5.1)
-- QT OpenGL support: YES (Qt5::OpenGL 5.5.1)
-- OpenGL support: YES (/usr/lib/x86_64-linux-gnu/libGLU.so /usr/lib/x86_64-linux-gnu/libGL.so)
-- VTK support: YES (ver 6.2.0)
--
-- Media I/O:
-- ZLib: /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.8)
-- JPEG: /usr/lib/x86_64-linux-gnu/libjpeg.so (ver )
-- WEBP: /usr/lib/x86_64-linux-gnu/libwebp.so (ver encoder: 0x0202)
-- PNG: /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.2.54)
-- TIFF: /usr/lib/x86_64-linux-gnu/libtiff.so (ver 42 - 4.0.6)
-- JPEG 2000: /usr/lib/x86_64-linux-gnu/libjasper.so (ver 1.900.1)
-- OpenEXR: /usr/lib/x86_64-linux-gnu/libImath.so /usr/lib/x86_64-linux-gnu/libIlmImf.so /usr/lib/x86_64-linux-gnu/libIex.so /usr/lib/x86_64-linux-gnu/libHalf.so /usr/lib/x86_64-linux-gnu/libIlmThread.so (ver 2.2.0)
-- GDAL: /usr/lib/libgdal.so
-- GDCM: NO
--
-- Video I/O:
-- DC1394 1.x: NO
-- DC1394 2.x: YES (ver 2.2.4)
-- FFMPEG: YES
-- avcodec: YES (ver 56.60.100)
-- avformat: YES (ver 56.40.101)
-- avutil: YES (ver 54.31.100)
-- swscale: YES (ver 3.1.101)
-- avresample: NO
-- GStreamer: NO
-- OpenNI: NO
-- OpenNI PrimeSensor Modules: NO
-- OpenNI2: NO
-- PvAPI: NO
-- GigEVisionSDK: NO
-- Aravis SDK: NO
-- UniCap: NO
-- UniCap ucil: NO
-- V4L/V4L2: NO/YES
-- XIMEA: NO
-- Xine: YES (ver 1.2.6)
-- gPhoto2: NO
--
-- Parallel framework: TBB (ver 4.4 interface 9002)
--
-- Other third-party libraries:
-- Use IPP: 9.0.1 [9.0.1]
-- at: /home/me/code/myproject/OpenCV-3.2.0/build/3rdparty/ippicv/ippicv_lnx
-- Use IPP Async: NO
-- Use VA: NO
-- Use Intel VA-API/OpenCL: NO
-- Use Lapack: NO
-- Use Eigen: YES (ver 3.2.92)
-- Use Cuda: NO
-- Use OpenCL: YES
-- Use OpenVX: NO
-- Use custom HAL: NO
--
-- OpenCL: <dynamic loading="loading" of="of" opencl="opencl" library="library">
-- Include path: /home/me/code/myproject/OpenCV-3.2.0/3rdparty/include/opencl/1.2
-- Use AMDFFT: NO
-- Use AMDBLAS: NO
--
-- Python 2:
-- Interpreter: /home/me/.envs/myenv/bin/python (ver 2.7.12)
-- Libraries: /usr/lib/x86_64-linux-gnu/libpython2.7.so (ver 2.7.12)
-- numpy: /home/me/.envs/myenv/local/lib/python2.7/site-packages/numpy/core/include (ver 1.13.1)
-- packages path: lib/python2.7/site-packages
--
-- Python 3:
-- Interpreter: /usr/bin/python3 (ver 3.5.2)
-- Libraries: /usr/lib/x86_64-linux-gnu/libpython3.5m.so (ver 3.5.2)
-- numpy: /usr/lib/python3/dist-packages/numpy/core/include (ver 1.11.0)
-- packages path: lib/python3.5/dist-packages
--
-- Python (for build): /home/me/.envs/myenv/bin/python
--
-- Java:
-- ant: /usr/bin/ant (ver 1.9.6)
-- JNI: /usr/lib/jvm/default-java/include /usr/lib/jvm/default-java/include/linux /usr/lib/jvm/default-java/include
-- Java wrappers: YES
-- Java tests: YES
--
-- Matlab: Matlab not found or implicitly disabled
--
-- Documentation:
-- Doxygen: /usr/bin/doxygen (ver 1.8.11)
--
-- Tests and samples:
-- Tests: YES
-- Performance tests: YES
-- C/C++ Examples: YES
--
-- Install path: /usr/local
--
-- cvconfig.h is in: /home/me/code/myproject/OpenCV-3.2.0/build
-- -----------------------------------------------------------------
--
</dynamic>Unfortunately, while this works and I can import
cv2in the shell, it cannot read video using the above script, probably due to incorrect compilation or linking offfmpeg? The confusing part is the system-wide installation of OpenCV works fine, even without ffmpeg installed !What am I doing wrong ? How can I get OpenCV working with a virtualenv ?
====
EDIT : Running the C++ video writing example has this result :
$ cd /home/me/code/myproject/OpenCV-3.2.0/build/bin
$ ./cpp-tutorial-video-write ../../samples/data/vtest.avi R Y
------------------------------------------------------------------------------
This program shows how to write video files.
You can extract the R or G or B color channel of the input video.
Usage:
./video-write [ R | G | B] [Y | N]
------------------------------------------------------------------------------
OpenCV: FFMPEG: tag 0xffffffff/'����' is not found (format 'avi / AVI (Audio Video Interleaved)')'
(cpp-tutorial-video-write:19523): GStreamer-CRITICAL **: gst_element_make_from_uri: assertion 'gst_uri_is_valid (uri)' failed
OpenCV Error: Unsupported format or combination of formats (Gstreamer Opencv backend does not support this codec.) in CvVideoWriter_GStreamer::open, file /home/me/code/myproject/OpenCV-3.2.0/modules/videoio/src/cap_gstreamer.cpp, line 1388
VIDEOIO(cvCreateVideoWriter_GStreamer(filename, fourcc, fps, frameSize, is_color)): raised OpenCV exception:
/home/me/code/myproject/OpenCV-3.2.0/modules/videoio/src/cap_gstreamer.cpp:1388: error: (-210) Gstreamer Opencv backend does not support this codec. in function CvVideoWriter_GStreamer::open
Could not open the output video for write: ../../samples/data/vtest.aviAnd the
opencv_test_videoiounit test reports the following : https://pastebin.com/q4mf224QHowever, running the c++ video starter example DOES work, with the following command and output, I can see the webcam working and streaming video in the highgui interface :
$ ./cpp-example-videocapture_starter 0
VIDEOIO ERROR: V4L: device 0: Unable to query number of channels
(ERROR)icvOpenAVI_XINE(): Unable to initialize video driver.
GStreamer: Error opening bin: no element "0"
press space to save a picture. q or esc to quit
init done
opengl support available -
Is this deadlocked ?
25 juillet 2017, par GathrosI’m writing test code to make a video player in c++. I had a lot of issues with the sound making cracking sounds, so I though I’m not sending enough data to the audio thread. Then I got the code and tried to make a player without audio but the decoding was happening in another thread ; while the main thread can just handle SDL2 windows and textures. But then I run the code the program just stops (not closed, so nothing happens but it is running) at a mutex lock with no errors.
my code :
extern "C"{
//FFmpeg libraries
#include <libavcodec></libavcodec>avcodec.h>
#include <libavformat></libavformat>avformat.h>
#include <libswscale></libswscale>swscale.h>
//SDL2 libraries
#include <sdl2></sdl2>SDL.h>
}
#ifdef __MINGW32__
#undef main /* Prevents SDL from overriding main() */
#endif
//C++ libraries
#include
#include <iostream>
#include <chrono>
#include <thread>
#include <atomic>
#include <mutex>
#include
#include <future>
// compatibility with newer API
#if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(55,28,1)
#define av_frame_alloc avcodec_alloc_frame
#define av_frame_free avcodec_free_frame
#endif
typedef struct PacketQueue {
AVPacketList *first_pkt, *last_pkt;
} PacketQueue;
AVCodecContext *pCodecCtx = nullptr;
PacketQueue videoq;
std::mutex mtx;
std::condition_variable convar;
std::atomic_int videoStream;
std::atomic<bool> quitting (false);
int packet_queue_put(PacketQueue *q, AVPacket *pkt){
AVPacketList *pkt1;
if(av_dup_packet(pkt) < 0){
return -1;
}
pkt1 = (AVPacketList*) av_malloc(sizeof(AVPacketList));
if(!pkt1){
return -1;
}
pkt1->pkt = *pkt;
pkt1->next = NULL;
std::lock_guard lock(mtx);
if (!q->last_pkt){
q->first_pkt = pkt1;
}else{
q->last_pkt->next = pkt1;
}
q->last_pkt = pkt1;
convar.notify_all();
return 0;
}
static int packet_queue_get(PacketQueue *q, AVPacket *pkt, int block){
AVPacketList *pkt1;
int ret;
std::unique_lock lk(mtx);
while(1){
if(quitting) {
ret = -1;
break;
}
pkt1 = q->first_pkt;
if(pkt1){
q->first_pkt = pkt1->next;
if(!q->first_pkt){
q->last_pkt = NULL;
}
*pkt = pkt1->pkt;
av_free(pkt1);
ret = 1;
break;
} else if (!block) {
ret = 0;
break;
} else {
convar.wait(lk);
}
}
return ret;
}
void decoderThreadFunc(char *fileurl){
AVFormatContext *pFormatCtx = nullptr;
AVCodecContext *pCodecCtxOrig = nullptr;
AVCodec *pCodec = nullptr;
AVPacket packet;
// Register all formats and codecs
av_register_all();
// Open video file
if(avformat_open_input(&pFormatCtx, fileurl, NULL, NULL) != 0){
fprintf(stderr, "Couldn't open file\n");
goto CleanDecoder; // Couldn't open file
}
// Retrieve stream information
if(avformat_find_stream_info(pFormatCtx, NULL) < 0){
fprintf(stderr, "Couldn't find stream info\n");
goto CleanDecoder; // Couldn't find stream information
}
// Find the first video stream
videoStream = av_find_best_stream(pFormatCtx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
if(videoStream < 0){
fprintf(stderr, "Couldn't not find a video stream\n");
goto CleanDecoder; // Didn't find a video stream
}
// Get a pointer to the codec context for the video stream
pCodecCtxOrig = pFormatCtx->streams[videoStream]->codec;
// Find the decoder for the video stream
pCodec = avcodec_find_decoder(pCodecCtxOrig->codec_id);
if(pCodec == NULL){
fprintf(stderr, "Couldn't find a codec\n");
goto CleanDecoder; // Codec not found
}
// Copy context
pCodecCtx = avcodec_alloc_context3(pCodec);
if(avcodec_copy_context(pCodecCtx, pCodecCtxOrig) != 0){
fprintf(stderr, "Couldn't copy codec context\n");
goto CleanDecoder; // Error copying codec context
}
// Open codec
if(avcodec_open2(pCodecCtx, pCodec, NULL) < 0){
fprintf(stderr, "Couldn't open codec\n");
goto CleanDecoder; // Could not open codec
}
// Init packet queue
memset(&videoq, 0, sizeof(PacketQueue));
convar.notify_all();
while(av_read_frame(pFormatCtx, &packet) >= 0 && !quitting){
// Is this a packet from the video stream?
if(packet.stream_index == videoStream){
packet_queue_put(&videoq, &packet);
}else {
// Free the packet that was allocated by av_read_frame
av_free_packet(&packet);
}
}
CleanDecoder:
quitting = true;
// Close the codec
avcodec_close(pCodecCtx);
avcodec_close(pCodecCtxOrig);
// Close the video file
avformat_close_input(&pFormatCtx);
}
int main(int argc, char *argv[]){
struct SwsContext *sws_ctx = nullptr;
AVFrame *pFrame = nullptr;
AVPacket packet;
int frameFinished;
SDL_Event event;
SDL_Window *screen;
SDL_Renderer *renderer;
SDL_Texture *texture;
Uint8 *yPlane, *uPlane, *vPlane;
size_t yPlaneSz, uvPlaneSz;
int uvPitch;
if(argc != 2){
fprintf(stderr, "Usage: %s <file>\n", argv[0]);
return 0;
}
std::thread decoderThread(decoderThreadFunc, argv[1]);
std::unique_lock lk(mtx, std::adopt_lock);
convar.wait(lk);
if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)){
fprintf(stderr, "Could not initialize SDL - %s\n", SDL_GetError());
goto CleanMain;
}
// Init packet queue
memset(&videoq, 0, sizeof(PacketQueue));
// Make a screen to put our video
screen = SDL_CreateWindow("Video Player", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, pCodecCtx->width, pCodecCtx->height, 0);
if(!screen){
fprintf(stderr, "SDL: could not create window - exiting\n");
goto CleanMain;
}
renderer = SDL_CreateRenderer(screen, -1, 0);
if(!renderer){
fprintf(stderr, "SDL: could not create renderer - exiting\n");
goto CleanMain;
}
// Allocate a place to put our YUV image on that screen
texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_YV12, SDL_TEXTUREACCESS_STREAMING, pCodecCtx->width, pCodecCtx->height);
if(!texture){
fprintf(stderr, "SDL: could not create texture - exiting\n");
goto CleanMain;
}
// Allocate video frame
pFrame = av_frame_alloc();
// initialize SWS context for software scaling
sws_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width,
pCodecCtx->height, PIX_FMT_YUV420P, SWS_BILINEAR, NULL, NULL, NULL);
// set up YV12 pixel array (12 bits per pixel)
yPlaneSz = pCodecCtx->width * pCodecCtx->height;
uvPlaneSz = pCodecCtx->width * pCodecCtx->height / 4;
yPlane = (Uint8*)malloc(yPlaneSz);
uPlane = (Uint8*)malloc(uvPlaneSz);
vPlane = (Uint8*)malloc(uvPlaneSz);
uvPitch = pCodecCtx->width / 2;
if(!yPlane || !uPlane || !vPlane){
fprintf(stderr, "Could not allocate pixel buffers - exiting\n");
goto CleanMain;
}
while(!quitting){
// Get packet
if(packet_queue_get(&videoq, &packet, 1) < 0){
continue;
}
// Is this a packet from the video stream?
if(packet.stream_index == videoStream){
// Decode video frame
avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
// Did we get a video frame?
if(frameFinished){
AVPicture pict;
pict.data[0] = yPlane;
pict.data[1] = uPlane;
pict.data[2] = vPlane;
pict.linesize[0] = pCodecCtx->width;
pict.linesize[1] = uvPitch;
pict.linesize[2] = uvPitch;
// Convert the image into YUV format that SDL uses
sws_scale(sws_ctx, (uint8_t const * const *) pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pict.data, pict.linesize);
SDL_UpdateYUVTexture(texture, NULL, yPlane, pCodecCtx->width, uPlane, uvPitch, vPlane, uvPitch);
SDL_RenderClear(renderer);
SDL_RenderCopy(renderer, texture, NULL, NULL);
SDL_RenderPresent(renderer);
}
}
// Free the packet that was allocated by av_read_frame
av_free_packet(&packet);
SDL_PollEvent(&event);
switch(event.type){
case SDL_QUIT:
quitting = true;
break;
default:
break;
}
}
CleanMain:
quitting = true;
decoderThread.join();
//Cleaning up SDL2
SDL_DestroyTexture(texture);
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(screen);
SDL_Quit();
// Free the YUV frame
av_frame_free(&pFrame);
free(yPlane);
free(uPlane);
free(vPlane);
return 0;
}
</file></bool></future></mutex></atomic></thread></chrono></iostream>I’m using this site and this post as a guide.
Update
I debugged the program after some comments and found that, now when getting packets from
videoq; it’s empty when I’m debuggingpacket_queue_get. If I debug the functionpacket_queue_put, it’s working fine is putting packets intovideoq. -
Writing Tee Pseudo muxer of FFMPEG by C++ code
23 août 2017, par Mohammad TahaIs there anyone who knows how to use Tee pseudo muxer of ffmpeg by c++ code. Kindly guide in doing this.
I am working on getting multiple outputs of muxed transport stream (ts) data. I am able to mux aac and h264 in ts. But i have to get muxed ts data in multiple output.So please guide me if anyone know how to do it with Tee pseudo muxer.
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