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• Using Gstreamer server to redirect a h264 source to diferent clients

  1er septembre 2017, par Thadeu Antonio Ferreira Melo

  We currently have a solution using ffmpeg to capture and stream the user desktop (windows) to a FFServer(linux) over the Internet. The server than can redirect the stream to clients on the PC, Android or Web browser. Using UDP or RTPS

  Our goal is to reduce the user latency and keep the bitrate down. For small scale tests are working fine. However, FFserver seems to be abandoned and we are facing some crashes and performance issues.

  It seems GStreamer server is in a better support state by the dev community.

  I have download and compile the gstreamer server 1.8, but the examples are not very clear.

  For the sake o simplicity I would like to have a local server that could receive h264 data stream from ffmpeg in one port of the local host and redirect it to another port.

  What is the minimal, simplest way to make that binding ?

• pthread_frame : fix uninitialized variable read

  27 mars 2017, par wm4

  pthread_frame : fix uninitialized variable read
  Could lead to random behavior. This possibly happened due to commit
  
  32a5b631267. This should/could probably be simplified, but for no apply
  
  a minimal fix to quell the errors.
  Tested-by : Michael Niedermayer <michael@niedermayer.cc>
  
  Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/pthread_frame.c

• ffmpeg build fails with gcc error even with gcc installed (C compiler test failed)

  15 mars 2023, par Martin

  I am on macos 11.2.3, trying to build ffmpeg in my terminal. When I run my script sh buildffmpeg.sh which is below :

  


  #!/bin/bash

# If you get error `c compiler failed` run `sudo apt install libglfw3-dev libglew-dev`
# apt-get install build-essential
# apt-get build-dep ffmpeg
# when running this on mac, you need to install some libraries such as 'brew install opus'

set -e

CWD=$(pwd)
PACKAGES="$CWD/packages"
WORKSPACE="$CWD/workspace"
ADDITIONAL_CONFIGURE_OPTIONS=""


mkdir -p "$PACKAGES"
mkdir -p "$WORKSPACE"

FFMPEG_TAG="$1"
FFMPEG_URL="http://git.ffmpeg.org/gitweb/ffmpeg.git/snapshot/74c4c539538e36d8df02de2484b045010d292f2c.tar.gz"

FFMPEG_ARCHIVE="$PACKAGES/ffmpeg.tar.gz"

if [ ! -f "$FFMPEG_ARCHIVE" ]; then
    echo "Downloading tag ${FFMPEG_TAG}..."
    curl -L -o "$FFMPEG_ARCHIVE" "$FFMPEG_URL"
fi

EXTRACTED_DIR="$PACKAGES/extracted"

mkdir -p "$EXTRACTED_DIR"

echo "Extracting..."
tar -xf "$FFMPEG_ARCHIVE" --strip-components=1 -C "$EXTRACTED_DIR"

cd "$EXTRACTED_DIR"

echo "Building..."

# Min electron supported version
MACOS_MIN="10.10"

./configure $ADDITIONAL_CONFIGURE_OPTIONS \
    --pkgconfigdir="$WORKSPACE/lib/pkgconfig" \
    --prefix=${WORKSPACE} \
    --pkg-config-flags="--static" \
    --extra-libs=-static \
    --extra-cflags=--static \
    --enable-cross-compile \
    --extra-cflags="-I$WORKSPACE/include -mmacosx-version-min=${MACOS_MIN}" \
    --extra-ldflags="-L$WORKSPACE/lib -mmacosx-version-min=${MACOS_MIN} -L/usr/local/opt/lame/lib -Wl,-rpath,/usr/local/opt/lame/lib" \
    --extra-libs="-lpthread -lm" \
    --enable-static \
    --disable-securetransport \
    --disable-debug \
    --disable-shared \
    --disable-ffplay \
    --disable-lzma \
    --disable-doc \
    --enable-version3 \
    --enable-pthreads \
    --enable-runtime-cpudetect \
    --enable-avfilter \
    --enable-filters \
    --disable-libxcb \
    --enable-gpl \
    --disable-libass \
    --enable-libmp3lame \
    --enable-libx264 \
    --enable-libopus

make -j 4
make install

otool -L "$WORKSPACE/bin/ffmpeg"
otool -L "$WORKSPACE/bin/ffprobe"

echo "Building done. The binaries can be found here: $WORKSPACE/bin/ffmpeg $WORKSPACE/bin/ffprobe"

mkdir ffmpeg-mac/ 
cp -r "$WORKSPACE/bin/" "$CWD/ffmpeg-mac/"

rm -rf "$PACKAGES"
rm -rf "$WORKSPACE"

exit 0



  


  It fails with this error :

  


  > sh buildffmpeg.sh

Extracting...
Building...
gcc is unable to create an executable file.
C compiler test failed.

If you think configure made a mistake, make sure you are using the latest
version from Git.  If the latest version fails, report the problem to the
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "ffbuild/config.log" produced by configure as this will help
solve the problem.


  


  I have been trying to solve this error, and have installed gcc with brew, if i run gcc -v I can see my installed gcc version :

  


  $ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/Cellar/gcc/12.2.0/bin/../libexec/gcc/x86_64-apple-darwin20/12/lto-wrapper
Target: x86_64-apple-darwin20
Configured with: ../configure --prefix=/usr/local/opt/gcc --libdir=/usr/local/opt/gcc/lib/gcc/current --disable-nls --enable-checking=release --with-gcc-major-version-only --enable-languages=c,c++,objc,obj-c++,fortran --program-suffix=-12 --with-gmp=/usr/local/opt/gmp --with-mpfr=/usr/local/opt/mpfr --with-mpc=/usr/local/opt/libmpc --with-isl=/usr/local/opt/isl --with-zstd=/usr/local/opt/zstd --with-pkgversion='Homebrew GCC 12.2.0' --with-bugurl=https://github.com/Homebrew/homebrew-core/issues --with-system-zlib --build=x86_64-apple-darwin20 --with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX11.sdk
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.2.0 (Homebrew GCC 12.2.0) 


  


  So if gcc is installed correctly (i think) why is it failing with a gcc error when I build ffmpeg ?

  


  ffbuild/config.log :

  


  ...
mktemp -u XXXXXX
9v9a2o
test_ld cc
test_cc
BEGIN /var/folders/p7/w8ysrm_x76v_z4n3nk70yd6m0000gn/T//ffconf.rUw6aGKJ/test.c
    1   int main(void){ return 0; }
END /var/folders/p7/w8ysrm_x76v_z4n3nk70yd6m0000gn/T//ffconf.rUw6aGKJ/test.c
gcc --static -I/Users/martinbarker/Documents/projects/rendertunev1.1.2/workspace/include -mmacosx-version-min=10.10 -c -o /var/folders/p7/w8ysrm_x76v_z4n3nk70yd6m0000gn/T//ffconf.rUw6aGKJ/test.o /var/folders/p7/w8ysrm_x76v_z4n3nk70yd6m0000gn/T//ffconf.rUw6aGKJ/test.c
gcc -L/Users/martinbarker/Documents/projects/rendertunev1.1.2/workspace/lib -mmacosx-version-min=10.10 -L/usr/local/opt/lame/lib -Wl,-rpath,/usr/local/opt/lame/lib -o /var/folders/p7/w8ysrm_x76v_z4n3nk70yd6m0000gn/T//ffconf.rUw6aGKJ/test /var/folders/p7/w8ysrm_x76v_z4n3nk70yd6m0000gn/T//ffconf.rUw6aGKJ/test.o -lpthread -lm -static
ld: warning: directory not found for option '-L/Users/martinbarker/Documents/projects/rendertunev1.1.2/workspace/lib'
ld: library not found for -lcrt0.o
collect2: error: ld returned 1 exit status
C compiler test failed.



  


  gcc test :

  


  apples-MacBook:gcctest apple$ export CC=$(which gcc)
apples-MacBook:gcctest apple$ export CXX=$(which g++)
apples-MacBook:gcctest apple$ ls
minimal.c
apples-MacBook:gcctest apple$ gcc -static -Wall -o minimal minimal.c -v
Apple LLVM version 10.0.0 (clang-1000.10.44.4)
Target: x86_64-apple-darwin17.0.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
 "/Library/Developer/CommandLineTools/usr/bin/clang" -cc1 -triple x86_64-apple-macosx10.13.0 -Wdeprecated-objc-isa-usage -Werror=deprecated-objc-isa-usage -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -discard-value-names -main-file-name minimal.c -static-define -mrelocation-model static -mthread-model posix -mdisable-fp-elim -fno-strict-return -masm-verbose -munwind-tables -target-cpu penryn -dwarf-column-info -debugger-tuning=lldb -target-linker-version 409.12 -v -resource-dir /Library/Developer/CommandLineTools/usr/lib/clang/10.0.0 -Wall -fdebug-compilation-dir /Users/apple/Documents/projects/gcctest -ferror-limit 19 -fmessage-length 157 -stack-protector 1 -fblocks -fencode-extended-block-signature -fobjc-runtime=macosx-10.13.0 -fmax-type-align=16 -fdiagnostics-show-option -fcolor-diagnostics -o /var/folders/7t/d2z0gq194s92vn5xz923gq5h0000gn/T/minimal-8cfbfc.o -x c minimal.c
clang -cc1 version 10.0.0 (clang-1000.10.44.4) default target x86_64-apple-darwin17.0.0
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /Library/Developer/CommandLineTools/usr/lib/clang/10.0.0/include
 /Library/Developer/CommandLineTools/usr/include
 /usr/include
 /System/Library/Frameworks (framework directory)
 /Library/Frameworks (framework directory)
End of search list.
 "/Library/Developer/CommandLineTools/usr/bin/ld" -demangle -lto_library /Library/Developer/CommandLineTools/usr/lib/libLTO.dylib -no_deduplicate -static -arch x86_64 -macosx_version_min 10.13.0 -o minimal -lcrt0.o /var/folders/7t/d2z0gq194s92vn5xz923gq5h0000gn/T/minimal-8cfbfc.o
ld: library not found for -lcrt0.o
clang: error: linker command failed with exit code 1 (use -v to see invocation)