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• Can't maintain desired fps with ffmpeg live stream when overlay is added

  1er avril 2019, par jawsware

  I’m attempting to produce a 4K live stream for YouTube.

  I’m capturing 2160p30 frames from a BlackMagic Design DeckLink Mini Recorder. I’m passing those frames to ffmpeg in their raw 8-bit 4:2:2 format. I’m able to achieve 30 fps encoding ( 16kbits/s and q= in the high 20s to low 30s) with my current parameters which are :

  ffmpeg -threads:v 2 -threads:a 8 -filter_threads 2
  
  -f rawvideo -framerate 30 -pixel_format uyvy422 -video_size 3840x2160 -i \\.\pipe\videopipe
  
  -f s16le -ac 2 -ar 44100 -i \\.\pipe\audiopipe
  
  -r 30 -g 60 -c:v h264_nvenc -pix_fmt yuv420p -preset fast -profile main
  
  -b:v 16000K -maxrate 24000k -bufsize 6000k
  
  -f flv "rtmp://a.rtmp.youtube.com/live2/xxxx-xxxx-xxxx-xxxx"

  I’m dilemma is that once I introduce an overlay graphic, my encoding fps drops to 28 at best. Which leads me to believe I’m barley achieving the 30 fps without the overlay. I’m only adding these parameters to include the overlay :

  -i logo.png
  
  
  
  -filter_complex "overlay=100:100"

  I further diminish the encoding fps (20 fps max) when I introduce a dynamic overlay which I feed to ffmpeg through an additional pipe.

  My questions are 1.) is there a better set a parameters I could be using to encode the 4K stream ? 2.) is there a better way to include the overlay ?

• avdevice/decklink_enc : Add support for compressed AC-3 output over SDI

  7 avril 2023, par Devin Heitmueller

  avdevice/decklink_enc : Add support for compressed AC-3 output over SDI
  Extend the decklink output to include support for compressed AC-3,
  
  encapsulated using the SMPTE ST 377:2015 standard.
  This functionality can be exercised by using the "copy" codec when
  
  the input audio stream is AC-3.  For example :
  ./ffmpeg -i /foo.ts -codec:a copy -f decklink 'UltraStudio Mini Monitor'
  Note that the default behavior continues to be to do PCM output,
  
  which means without specifying the copy codec a stream containing
  
  AC-3 will be decoded and downmixed to stereo audio before output.
  Thanks to Marton Balint for providing feedback.
  Signed-off-by : Devin Heitmueller <dheitmueller@ltnglobal.com>
  
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavdevice/decklink_enc.cpp

• 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)