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ffmpeg Undefined referance to several swr functions [duplicate]
21 mai 2022, par user19068953I'm trying to staticly link ffmpeg to my project, i downloaded the ffmpeg source files from a github repo because it had pre writen cmake files, which i needed for this exact problem but it changed nothing (https://github.com/Pawday/ffmpeg-cmake). I edited the file a little and posted it below, and added them to lib/ffmpeg in my project directory. I first ran ./configure, then ran make, then make install like the install guide suggested. Then i ran cmake . followed by make. It compiled just fine and i ran a test without any errors :


extern "C"{
 #include <libavcodec></libavcodec>avcodec.h>
}

#include <iostream>
int main(int argc, char* argv[]) {
 if (argc < 2) {
 std::cout << "provide a filename" << std::endl;
 return -1;
 AVPacket *pkt = av_packet_alloc();
 }
}
</iostream>

I was following the examples that ffmpeg provides, so i added this :


const AVCodec *codec = avcodec_find_decoder(AV_CODEC_ID_MPEG1VIDEO);


But now i have this huge error :


/usr/bin/ld: /usr/local/lib/libavcodec.a(opusdec.o): in function 

`opus_decode_subpacket':
/home/t/Desktop/Code/lib/ffmpeg/libavcodec/opusdec.c:346: undefined reference to `swr_is_initialized'
/usr/bin/ld: /usr/local/lib/libavcodec.a(opusdec.o): in function `opus_decode_frame':
/home/t/Desktop/Code/lib/ffmpeg/libavcodec/opusdec.c:188: undefined reference to `swr_is_initialized'
/usr/bin/ld: /usr/local/lib/libavcodec.a(opusdec.o): in function `opus_init_resample':
/home/t/Desktop/Code/lib/ffmpeg/libavcodec/opusdec.c:136: undefined reference to `swr_init'
/usr/bin/ld: /home/t/Desktop/Code/lib/ffmpeg/libavcodec/opusdec.c:142: undefined reference to `swr_convert'
/usr/bin/ld: /usr/local/lib/libavcodec.a(opusdec.o): in function `opus_decode_frame':
/home/t/Desktop/Code/lib/ffmpeg/libavcodec/opusdec.c:202: undefined reference to `swr_convert'
/usr/bin/ld: /usr/local/lib/libavcodec.a(opusdec.o): in function `opus_flush_resample':
/home/t/Desktop/Code/lib/ffmpeg/libavcodec/opusdec.c:90: undefined reference to `swr_convert'
/usr/bin/ld: /usr/local/lib/libavcodec.a(opusdec.o): in function `opus_decode_subpacket':
/home/t/Desktop/Code/lib/ffmpeg/libavcodec/opusdec.c:379: undefined reference to `swr_close'
/usr/bin/ld: /home/t/Desktop/Code/lib/ffmpeg/libavcodec/opusdec.c:346: undefined reference to `swr_is_initialized'
/usr/bin/ld: /usr/local/lib/libavcodec.a(opusdec.o): in function `opus_decode_flush':
/home/t/Desktop/Code/lib/ffmpeg/libavcodec/opusdec.c:582: undefined reference to `swr_close'
/usr/bin/ld: /usr/local/lib/libavcodec.a(opusdec.o): in function `opus_decode_close':
/home/t/Desktop/Code/lib/ffmpeg/libavcodec/opusdec.c:607: undefined reference to `swr_free'
/usr/bin/ld: /usr/local/lib/libavcodec.a(opusdec.o): in function `opus_decode_init':
/home/t/Desktop/Code/lib/ffmpeg/libavcodec/opusdec.c:660: undefined reference to `swr_alloc'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/Interview.dir/build.make:122: bin/Interview] Error 1
make[1]: *** [CMakeFiles/Makefile2:420: CMakeFiles/Interview.dir/all] Error 2
make: *** [Makefile:84: all] Error 2


I find some questions with similar issues to no avail :


FFmpeg seems to be version conflict
Linking libavcodec and libavformat : Undefined references


NOTE : previously i tried downloading ffmpeg with home-brew and pkg-config maybe that is causing an error, but my guess is my cmake file is faulty.


project/CMakeLists :


cmake_minimum_required(VERSION 3.14)

project(Interview C CXX)
set(CMAKE_CXX_STANDARD 14)

SET( EXECUTABLE_OUTPUT_PATH ${dir}/bin )
set( CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/bin )
set( CMAKE_C_FLAGS "-lswresample")

add_subdirectory(lib/ffmpeg)

add_definitions(-DGL_SILENCE_DEPRECATION)

list(APPEND SOURCES
 src/main.cpp
 src/vipch.h
 src/VideoDecoder.cpp
 src/VideoDecoder.h
 src/Application.cpp
 src/Application.h
 #src/OpenGLRenderer.cpp
 #src/OpenGLRenderer.h
 #src/Layer.h
 #src/Layer.cpp
)

find_path(AVCODEC_INCLUDE_DIR libavcodec/avcodec.h)
find_library(AVCODEC_LIBRARY avcodec)

find_path(AVFORMAT_INCLUDE_DIR libavformat/avformat.h)
find_library(AVFORMAT_LIBRARY avformat)

find_path(AVDEVICE_INCLUDE_DIR libavdevice/avdevice.h)
find_library(AVDEVICE_LIBRARY avdevice)

find_path(AVCODEC_INCLUDE_DIR libavcodec/avcodec.h)
find_library(AVCODEC_LIBRARY avcodec)

set(THREADS_PREFER_PTHREAD_FLAG ON)
find_package(Threads REQUIRED)

add_executable(Interview src/main.cpp src/Application.cpp src/Application.h ${SOURCES})

target_link_libraries(Interview PRIVATE Threads::Threads)

if(APPLE)
 list(APPEND EXTRA_LIBS
 "-framework OpenGL"
 )

 configure_file(
 ${CMAKE_CURRENT_SOURCE_DIR}/assets/MacOSXBundleInfo.plist.in
 ${CMAKE_CURRENT_BINARY_DIR}/assets/MacOSXBundleInfo.plist
 )

 set_target_properties(Interview PROPERTIES
 MACOSX_BUNDLE_INFO_PLIST ${CMAKE_CURRENT_BINARY_DIR}/assets/MacOSXBundleInfo.plist
 )

elseif(WIN32)
 list(APPEND EXTRA_LIBS
 "-lglu32 -lopengl32"
 )
 set(CMAKE_EXE_LINKER_FLAGS "-std=gnu99 -static -static-libgcc -static-libstdc++ -mwindows")

endif()

list(APPEND EXTRA_LIBS
"-lGL -lGLU -lX11 -lz -lva -lswresample"
)

find_package(OpenGL REQUIRED)
find_package(GLEW REQUIRED)

#target_link_libraries(Interview ${CORELIBS})


target_include_directories(Interview PRIVATE 
 ${AVCODEC_INCLUDE_DIR} 
 ${AVFORMAT_INCLUDE_DIR}
 ${AVUTIL_INCLUDE_DIR}
 ${AVDEVICE_INCLUDE_DIR} 
 ${OPENGL_INCLUDE_DIR}
 ${GLEW_INCLUDE_DIRS}
)

target_link_libraries(Interview PRIVATE 
 ${AVCODEC_LIBRARY} 
 ${AVFORMAT_LIBRARY} 
 ${AVUTIL_LIBRARY} 
 ${AVDEVICE_LIBRARY} 
 ${OPENGL_LIBRARY}
 ${GLEW_LIBRARIES}
)


NOTE : i previously had a really similar error with pthread but with some fixes to cmake and installing pthread i fixed it.


project/lib/ffmpeg/CMakeLists :


cmake_minimum_required(VERSION 3.15)

project(FFMPEG C CXX)

add_library(ffmpeg_config INTERFACE)

#TODO:[cmake] COMMON DEFINES (config.h)
# create list with all that and then pick required from that list in each target
target_compile_definitions(ffmpeg_config INTERFACE FFMPEG_CONFIGURATION="")
target_compile_definitions(ffmpeg_config INTERFACE FFMPEG_DATADIR="")
target_compile_definitions(ffmpeg_config INTERFACE AVCONV_DATADIR="")
target_compile_definitions(ffmpeg_config INTERFACE FFMPEG_LICENSE="")

target_compile_definitions(ffmpeg_config INTERFACE CC_IDENT="")

target_compile_definitions(ffmpeg_config INTERFACE HAVE_THREADS=0)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_PTHREADS=0)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_W32THREADS=0)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_OS2THREADS=0)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_ISNAN=0)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_MMXEXT=0)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_MMX2=HAVE_MMXEXT)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_MMX2=HAVE_MMXEXT)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_MMX_INLINE=0)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_MMX=0)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_AV_CONFIG_H=1)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_ALTIVEC=0)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_MMXEXT_INLINE=0)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_NEON=0)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_AMD3DNOW_INLINE=0)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_X86ASM=0)
if(WIN32)
 target_compile_definitions(ffmpeg_config INTERFACE HAVE_MKSTEMP=0)
else()
 target_compile_definitions(ffmpeg_config INTERFACE HAVE_MKSTEMP=1)
endif()


#TODO:[cmake] detect each function and set to 0 if missing (they are in math.h)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_CBRT=1)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_CBRTF=1)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_COPYSIGN=1)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_ERF=1)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_HYPOT=1)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_RINT=1)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_LRINT=1)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_LRINTF=1)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_ROUND=1)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_ROUNDF=1)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_TRUNC=1)
target_compile_definitions(ffmpeg_config INTERFACE HAVE_TRUNCF=1)


target_link_libraries(ffmpeg_config INTERFACE ffmpeg_compat)

include (TestBigEndian)
TEST_BIG_ENDIAN(IS_BIG_ENDIAN)
if(IS_BIG_ENDIAN)
 target_compile_definitions(ffmpeg_config INTERFACE HAVE_BIGENDIAN=1)
else()
 target_compile_definitions(ffmpeg_config INTERFACE HAVE_BIGENDIAN=0)
endif()

target_compile_definitions(ffmpeg_config INTERFACE av_restrict=)

target_compile_definitions(ffmpeg_config INTERFACE CONFIG_THIS_YEAR=2021)

target_compile_definitions(ffmpeg_config INTERFACE CONFIG_MEMORY_POISONING=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_FRAME_THREAD_ENCODER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_MEMORY_POISONING=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_GRAY=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_ERROR_RESILIENCE=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_MPEGVIDEODEC=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_SMALL=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_H264_D3D11VA_HWACCEL=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_H264_DXVA2_HWACCEL=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_H264_NVDEC_HWACCEL=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_H264_VAAPI_HWACCEL=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_H264_VIDEOTOOLBOX_HWACCEL=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_H264_VDPAU_HWACCEL=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_NETWORK=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_XVMC=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_FORMAT_FILTER=1)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_PNG_DECODER=1)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_APNG_DECODER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_INFLATE_WRAPPER=1)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_DEFLATE_WRAPPER=1)

target_compile_definitions(ffmpeg_config INTERFACE CONFIG_AVUTIL=1)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_AVCODEC=1)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_AVFORMAT=1)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_AVDEVICE=1)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_SWSCALE=1)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_SWRESAMPLE=1)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_POSTPROC=1)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_AVFILTER=1)



#CONFIG MUXERS
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_H264_MUXER=1)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE2_MUXER=1)

#CONFIG DEMUXERS
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE2_DEMUXER=1)

# look at the end of libavformat/img2dec.c file
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_BMP_PIPE_DEMUXER=1)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_CRI_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_DDS_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_DPX_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_EXR_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_GEM_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_GIF_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_J2K_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_JPEG_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_JPEGLS_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_PAM_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_PBM_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_PCX_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_PGM_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_PGMYUV_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_PGX_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_PHOTOCD_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_PICTOR_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_PNG_PIPE_DEMUXER=1)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_PPM_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_PSD_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_QDRAW_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_SGI_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_SUNRAST_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_SVG_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_TIFF_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_WEBP_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_XBM_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_XPM_PIPE_DEMUXER=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_IMAGE_XWD_PIPE_DEMUXER=0)


#CONFIG PROTOCOLS
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_FILE_PROTOCOL=1)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_PIPE_PROTOCOL=1)

target_compile_definitions(ffmpeg_config INTERFACE CONFIG_ZLIB=0)
target_compile_definitions(ffmpeg_config INTERFACE CONFIG_SWSCALE_ALPHA=0)

target_compile_definitions(ffmpeg_config INTERFACE ARCH_X86_32=0)
target_compile_definitions(ffmpeg_config INTERFACE ARCH_X86_64=0)
target_compile_definitions(ffmpeg_config INTERFACE ARCH_AARCH64=0)
target_compile_definitions(ffmpeg_config INTERFACE ARCH_ARM=0)
target_compile_definitions(ffmpeg_config INTERFACE ARCH_PPC=0)
target_compile_definitions(ffmpeg_config INTERFACE ARCH_X86=0)
target_compile_definitions(ffmpeg_config INTERFACE ARCH_MIPS=0)
target_compile_definitions(ffmpeg_config INTERFACE ARCH_ALPHA=0)
target_compile_definitions(ffmpeg_config INTERFACE ARCH_LOONGARCH=0)
target_compile_definitions(ffmpeg_config INTERFACE ARCH_LOONGARCH64=0)

target_compile_definitions(ffmpeg_config INTERFACE SWS_MAX_FILTER_SIZE=256)

#_________________________WARNINGS__________________________________________
#TODO[cmake]: set it for all targets individually or remove for WARNING HELL
if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
 add_compile_options("-w")
endif()

if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
 add_compile_options("-w")
endif()

if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
 cmake_policy(SET CMP0092 NEW) #cmake disable std MSVC warnings in CMAKE_C_FLAGS
 #CMAKE_DEPFILE_FLAGS_C var in windows contains only /showIncludes and produce include tree
 set(CMAKE_DEPFILE_FLAGS_C "") #erase it
 add_compile_options("/w")
endif()

file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/include/config.h "//cmake config will define all that")
target_include_directories(ffmpeg_config INTERFACE ${CMAKE_CURRENT_BINARY_DIR}/include)

#TODO[cmake]: resolve config_components.h
file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/include/config_components.h "//")
target_include_directories(ffmpeg_config INTERFACE ${CMAKE_CURRENT_BINARY_DIR}/include)

add_subdirectory(compat)
add_subdirectory(libavutil)
add_subdirectory(libavcodec)
add_subdirectory(libavformat)
add_subdirectory(libavdevice)
add_subdirectory(libavfilter)
add_subdirectory(libswresample)
add_subdirectory(libswscale)
add_subdirectory(libpostproc)

add_subdirectory(fftools)

add_subdirectory(doc/examples)


find_path(AVCODEC_INCLUDE_DIR libavcodec/avcodec.h)
find_library(AVCODEC_LIBRARY avcodec)

find_path(AVFORMAT_INCLUDE_DIR libavformat/avformat.h)
find_library(AVFORMAT_LIBRARY avformat)

find_path(AVDEVICE_INCLUDE_DIR libavdevice/avdevice.h)
find_library(AVDEVICE_LIBRARY avdevice)

find_path(AVCODEC_INCLUDE_DIR libavcodec/avcodec.h)
find_library(AVCODEC_LIBRARY avcodec)

if(APPLE)
 list(APPEND EXTRA_LIBS
 "-framework OpenGL"
 )

 configure_file(
 ${CMAKE_CURRENT_SOURCE_DIR}/assets/MacOSXBundleInfo.plist.in
 ${CMAKE_CURRENT_BINARY_DIR}/assets/MacOSXBundleInfo.plist
 )

 set_target_properties(FFMPEG PROPERTIES
 MACOSX_BUNDLE_INFO_PLIST ${CMAKE_CURRENT_BINARY_DIR}/assets/MacOSXBundleInfo.plist
 )

elseif(WIN32)
 list(APPEND EXTRA_LIBS
 "-lglu32 -lopengl32"
 )
 set(CMAKE_EXE_LINKER_FLAGS "-std=gnu99 -static -static-libgcc -static-libstdc++ -mwindows")
else()
 list(APPEND EXTRA_LIBS
 "-lGL -lGLU -lX11"
 )
endif()


#target_link_libraries(Interview ${CORELIBS})

set( CMAKE_C_FLAGS "-lswresample")

list(APPEND EXTRA_LIBS
"-lGL -lGLU -lX11 -lz -lva -lswresample"
)

target_include_directories(ffmpeg_config INTERFACE
 ${AVCODEC_INCLUDE_DIR} 
 ${AVFORMAT_INCLUDE_DIR}
 ${AVUTIL_INCLUDE_DIR}
 ${AVDEVICE_INCLUDE_DIR} 
 ${OPENGL_INCLUDE_DIR}
 ${GLEW_INCLUDE_DIRS}
)

target_link_libraries(ffmpeg_config INTERFACE
 ${AVCODEC_LIBRARY} 
 ${AVFORMAT_LIBRARY} 
 ${AVUTIL_LIBRARY} 
 ${AVDEVICE_LIBRARY} 
 ${OPENGL_LIBRARY}
 ${GLEW_LIBRARIES}
)


Ubuntu 22.04, cmake 3.16.3, ffmpeg version git-2022-05-20-cb47f66


-
Stream image from Android with FFMPEG
9 février 2023, par xnokI'm currently receiving images from an external source as byte array and I would like to send it as raw video format via ffmpeg to a stream URL, where I have a RTSP server that receives RTSP streams (a similar unanswered question). However, I haven't worked with FFMPEG in Java, so i can't find an example on how to do it. I have a callback that copies the image bytes to a byte array as follows :


public class MainActivity extends Activity {
 final String rtmp_url = "rtmp://192.168.0.12:1935/live/test";
 private int PREVIEW_WIDTH = 384;
 private int PREVIEW_HEIGHT = 292;
 private String TAG = "MainActivity";
 String ffmpeg = Loader.load(org.bytedeco.ffmpeg.ffmpeg.class);
 final String command[] = {ffmpeg,
 "-y", //Add "-re" for simulated readtime streaming.
 "-f", "rawvideo",
 "-vcodec", "rawvideo",
 "-pix_fmt", "bgr24",
 "-s", (Integer.toString(PREVIEW_WIDTH) + "x" + Integer.toString(PREVIEW_HEIGHT)),
 "-r", "10",
 "-i", "pipe:",
 "-c:v", "libx264",
 "-pix_fmt", "yuv420p",
 "-preset", "ultrafast",
 "-f", "flv",
 rtmp_url};
 
 private UVCCamera mUVCCamera;

public void handleStartPreview(Object surface) throws InterruptedException, IOException {
 Log.e(TAG, "handleStartPreview:mUVCCamera" + mUVCCamera + " mIsPreviewing:");
 if ((mUVCCamera == null)) return;
 Log.e(TAG, "handleStartPreview2 ");
 try {
 mUVCCamera.setPreviewSize(mWidth, mHeight, 1, 26, 0, UVCCamera.DEFAULT_BANDWIDTH, 0);
 Log.e(TAG, "handleStartPreview3 mWidth: " + mWidth + "mHeight:" + mHeight);
 } catch (IllegalArgumentException e) {
 try {
 // fallback to YUV mode
 mUVCCamera.setPreviewSize(mWidth, mHeight, 1, 26, UVCCamera.DEFAULT_PREVIEW_MODE, UVCCamera.DEFAULT_BANDWIDTH, 0);
 Log.e(TAG, "handleStartPreview4");
 } catch (IllegalArgumentException e1) {
 callOnError(e1);
 return;
 }
 }
 Log.e(TAG, "handleStartPreview: startPreview1");
 int result = mUVCCamera.startPreview();
 mUVCCamera.setFrameCallback(mIFrameCallback, UVCCamera.PIXEL_FORMAT_RGBX);
 mUVCCamera.startCapture();
 Toast.makeText(MainActivity.this,"Camera Started",Toast.LENGTH_SHORT).show();
 ProcessBuilder pb = new ProcessBuilder(command);
 pb.redirectErrorStream(true);
 Process process = pb.start();
 BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
 OutputStream writer = process.getOutputStream();
 byte img[] = new byte[192*108*3];
 for (int i = 0; i < 10; i++)
 {
 for (int y = 0; y < 108; y++)
 {
 for (int x = 0; x < 192; x++)
 {
 byte r = (byte)((x * y + i) % 255);
 byte g = (byte)((x * y + i*10) % 255);
 byte b = (byte)((x * y + i*20) % 255);
 img[(y*192 + x)*3] = b;
 img[(y*192 + x)*3+1] = g;
 img[(y*192 + x)*3+2] = r;
 }
 }

 writer.write(img);
 }

 writer.close();
 String line;
 while ((line = reader.readLine()) != null)
 {
 System.out.println(line);
 }

 process.waitFor();
}
public static void buildRawFrame(Mat img, int i)
{
 int p = img.cols() / 60;
 img.setTo(new Scalar(60, 60, 60));
 String text = Integer.toString(i+1);
 int font = Imgproc.FONT_HERSHEY_SIMPLEX;
 Point pos = new Point(img.cols()/2-p*10*(text.length()), img.rows()/2+p*10);
 Imgproc.putText(img, text, pos, font, p, new Scalar(255, 30, 30), p*2); //Blue number
}


Additionally : Android Camera Capture using FFmpeg


uses ffmpeg to capture frame by frame from native android camera and instead of pushing it via RTMP, they used to generate a video file as output. Although how the image was passed via ffmpeg was not informed.


frameData is my byte array and I'd like to know how can I write the necessary ffmpeg commands using ProcessBuilder to send an image via RTSP using ffmpeg for a given URL.


An example of what I am trying to do, In Python 3 I could easily do it by doing :


import cv2
import numpy as np
import socket
import sys
import pickle
import struct
import subprocess

fps = 25
width = 224
height = 224
rtmp_url = 'rtmp://192.168.0.13:1935/live/test'
 
 
 
 command = ['ffmpeg',
 '-y',
 '-f', 'rawvideo',
 '-vcodec', 'rawvideo',
 '-pix_fmt', 'bgr24',
 '-s', "{}x{}".format(width, height),
 '-r', str(fps),
 '-i', '-',
 '-c:v', 'libx264',
 '-pix_fmt', 'yuv420p',
 '-preset', 'ultrafast',
 '-f', 'flv',
 rtmp_url]
 
 p = subprocess.Popen(command, stdin=subprocess.PIPE)
 
 while(True):
 frame = np.random.randint([255], size=(224, 224, 3))
 frame = frame.astype(np.uint8)
 p.stdin.write(frame.tobytes())


I would like to do the same thing in Android


Update : I can reproduce @Rotem 's answer on Netbeans although, in Android I am getting NullPointer exception error when trying to execute pb.start().


Process: com.infiRay.XthermMini, PID: 32089
 java.lang.NullPointerException
 at java.lang.ProcessBuilder.start(ProcessBuilder.java:1012)
 at com.infiRay.XthermMini.MainActivity.handleStartPreview(MainActivity.java:512)
 at com.infiRay.XthermMini.MainActivity.startPreview(MainActivity.java:563)
 at com.infiRay.XthermMini.MainActivity.access$1000(MainActivity.java:49)
 at com.infiRay.XthermMini.MainActivity$3.onConnect(MainActivity.java:316)
 at com.serenegiant.usb.USBMonitor$3.run(USBMonitor.java:620)
 at android.os.Handler.handleCallback(Handler.java:938)
 at android.os.Handler.dispatchMessage(Handler.java:99)
 at android.os.Looper.loopOnce(Looper.java:226)
 at android.os.Looper.loop(Looper.java:313)
 at android.os.HandlerThread.run(HandlerThread.java:67)
2022-06-02 11:47:20.300 32089-1049/com.infiRay.XthermMini E/libUVCCamera: [1049*UVCPreviewIR.cpp:505:uvc_preview_frame_callback]:receive err data
2022-06-02 11:47:20.304 32089-1049/com.infiRay.XthermMini E/libUVCCamera: [1049*UVCPreviewIR.cpp:505:uvc_preview_frame_callback]:receive err data
2022-06-02 11:47:20.304 32089-1049/com.infiRay.XthermMini E/libUVCCamera: [1049*UVCPreviewIR.cpp:505:uvc_preview_frame_callback]:receive err data
2022-06-02 11:47:20.308 32089-1049/com.infiRay.XthermMini E/libUVCCamera: [1049*UVCPreviewIR.cpp:505:uvc_preview_frame_callback]:receive err data
2022-06-02 11:47:20.312 32089-32089/com.infiRay.XthermMini E/MainActivity: onPause:
2022-06-02 11:47:20.314 32089-32581/com.infiRay.XthermMini I/Process: Sending signal. PID: 32089 SIG: 9


-
How to send libmmpeg AVPacket through WebRTC (using libdatachannel)
29 mars 2022, par mikeI'm encoding a video frame with the
ffmpeglibraries, generating anAVPacketwith compressed data.

Thanks to some recent advice here on S/O, I am trying to send that frame over a network using the
WebRTClibrarylibdatachannel, specifically by adapting the example here :

https://github.com/paullouisageneau/libdatachannel/tree/master/examples/streamer

I am seeing problems inside
h264rtppacketizer.cpp(part of the library, not the example) which are almost certainly to do with how I'm providing the sample data.
(I don't think that this is anything to do with libdatachannel specifically, it will be an issue with what I'm sending)

The example code reads each encoded frame from a file, and populates a
sampleby setting the content of the file to the contents of the file :

sample = *reinterpret_cast *>(&fileContents);

sampleis just astd::vector<byte>;</byte>

I have naively copied the contents of an
AVPacket->datapointer into thesamplevector :

sample.resize(pkt->size);
memcpy(sample.data(), pkt->data, pkt->size * sizeof(std::byte)); 


but the packetizer is falling over when trying to get length values out of that data.
Specifically, in the following code, the first iteration gets a length of 1, but the second, looking up index 5, gives 1119887324. This is way too big for my data, which is only 3526 bytes (the whole frame is a single colour so likely to be small once encoded) :


while (index < message->size()) {
assert(index + 4 < message->size());
auto lengthPtr = (uint32_t *)(message->data() + index);
uint32_t length = ntohl(*lengthPtr);
auto naluStartIndex = index + 4;
auto naluEndIndex = naluStartIndex + length;
assert(naluEndIndex <= message->size()); 
 
auto begin = message->begin() + naluStartIndex;
auto end = message->begin() + naluEndIndex;
nalus->push_back(std::make_shared<nalunit>(begin, end));
index = naluEndIndex;
}
</nalunit>

Here is a dump of


uint32_t length = ntohl(*lengthPtr);


for the first few elements of the message (
*lengthPtrin parentheses) :

[2022-03-29 15:12:01.182] [info] index 0: 1 (16777216)
[2022-03-29 15:12:01.183] [info] index 1: 359 (1728118784)
[2022-03-29 15:12:01.184] [info] index 2: 91970 (1114046720)
[2022-03-29 15:12:01.186] [info] index 3: 23544512 (3225577217)
[2022-03-29 15:12:01.186] [info] index 4: 1732427807 (532693607)
[2022-03-29 15:12:01.187] [info] index 5: 1119887324 (3693068354)
[2022-03-29 15:12:01.188] [info] index 6: 3223313413 (98312128)
[2022-03-29 15:12:01.188] [info] index 7: 534512896 (384031)
[2022-03-29 15:12:01.188] [info] index 8: 3691315291 (1526728156)
[2022-03-29 15:12:01.189] [info] index 9: 83909537 (2707095557)
[2022-03-29 15:12:01.189] [info] index 10: 6004992 (10574592)
[2022-03-29 15:12:01.190] [info] index 11: 1537277952 (41307)
[2022-03-29 15:12:01.190] [info] index 12: 2701131779 (50331809)
[2022-03-29 15:12:01.192] [info] index 13: 768 (196608)


(I know I should post a complete sample, I am working on it)


- 

-
I am fairly sure I am just missing something basic. E.g. am I supposed to do something with the
AVPacketside_data, does AVPacket have or miss some header info ?

-
If I just fwrite the
pkt->datafor a single frame to disk, I can read the codec information with ffprobe :







Input #0, h264, from 'encodedOut.h264':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: h264 (Constrained Baseline), yuv420p(progressive), 1280x720, 30 tbr, 1200k tbn


- 

- whereas the same for the example input files (again a single frame) gives the following :




[h264 @ 000001c88d1135c0] Format h264 detected only with low score of 1, misdetection possible!
[h264 @ 000001c88f337400] missing picture in access unit with size 85306
[extract_extradata @ 000001c88d11ee40] No start code is found.
sample-0.h264: Invalid data found when processing input


-
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