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• How to display live frame rate on top of video using ffmpeg ? [closed]

  2 juin 2021, par walking lime

  I want to display live frame rate over video using ffmpeg.I am using following command to get the frame number.Is it possible to get the frame rate as well ?.Thanks.

  


  ffmpeg -re -stream_loop -1 -i /dev/video0 -c:v libx264 -preset veryfast -tune zerolatency -profile:v baseline -pix_fmt yuv420p -bf 0 -x264-params keyint=30:scenecut=0 -vf "drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeMonoBold.ttf: text='%{frame_num}': start_number=1: x=(w-tw)/2: y=h-(2*lh): fontcolor=black: fontsize=20: box=1: boxcolor=white: boxborderw=5"   -an -f mpegts udp://localhost:4000?pkt_size=1316


  


• Im failing to build .so file for android from FFMPEG

  15 juillet 2020, par yejafot

  I tried many times with different versions of ffmpeg but failed eventually. I dont know how they wrote .sh file to configure different tools. Here are some .sh files i tried and it all failed. Either it shows only android/share folder instead of

  


  


  • android/include

    


  


  • android/lib

    


  


  • android/share

    


  


  


  OR

  


  i end up in error like no file or folder exist,etc

  


  I will share build_arm64-v8a different version of files below

  


  VERSION 1

  


  #!/bin/bash
export NDK=/media/sf_sharing/android-ndk
export HOST_TAG=linux-x86_64 # adjust to your building host
export TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/$HOST_TAG

export CC=$TOOLCHAIN/bin/aarch64-linux-android21-clang
export CXX=$TOOLCHAIN/bin/aarch64-linux-android21-clang++

function build_arm64-v8a
{
  ./configure \
  --prefix=./android/arm64-v8a \
  --enable-static \
  --enable-pic \
  --disable-asm \
  --disable-opencl \
  --disable-cli \
  --host=aarch64-linux \
  --cross-prefix=$TOOLCHAIN/bin/aarch64-linux-android- \
  --sysroot=$TOOLCHAIN/sysroot \

  make clean
  make
  make install
}

build_arm64-v8a
echo build_arm64-v8a finished


  


  VERSION 2

  


  #!/bin/bash

TOOLCHAIN=/media/sf_sharing/my-android-toolchain64
CROSS_PREFIX=$TOOLCHAIN/bin/aarch64-linux-android-
rm -f $(pwd)/compat/strtod.o
function build_one
{
./configure --prefix=$PREFIX --enable-shared --disable-static --enable-protocol=file --enable-pic --enable-small --disable-programs --disable-doc --disable-symver --target-os=android --enable-cross-compile --cross-prefix=$CROSS_PREFIX --extra-cflags="-Os -fpic $ADDI_CFLAGS" --extra-ldflags="$ADDI_LDFLAGS" --sysroot=$TOOLCHAIN/sysroot $ADDITIONAL_CONFIG_FLAG
make clean
make -j2
make install
}

CPU=arm64-v8a
mkdir -p $(pwd)/android/$CPU
PREFIX=$(pwd)/android/$CPU
ADDI_CFLAGS="-march=armv8-a"
ADDI_LDFLAGS="-L$TOOLCHAIN/sysroot/usr/lib"
ADDITIONAL_CONFIG_FLAG="--arch=aarch64 --enable-yasm"
build_one


  


  VERSION 3

  


  #!/bin/bash
export NDK=/media/sf_sharing/android-ndk
export HOST_TAG=linux-x86_64 # adjust to your building host
export TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/$HOST_TAG

export CC=$TOOLCHAIN/bin/aarch64-linux-android21-clang
export CXX=$TOOLCHAIN/bin/aarch64-linux-android21-clang++

function build_arm64-v8a
{
  ./configure \
  --prefix="$HOME/ffmpeg_build" \
  --pkg-config-flags="--static" \
  --extra-cflags="-I$HOME/ffmpeg_build/include" \
  --extra-ldflags="-L$HOME/ffmpeg_build/lib" \
  --extra-libs="-lpthread -lm" \
  --bindir="$HOME/bin" \
  --enable-gpl \
  --enable-gnutls \
  --enable-libaom \
  --enable-libass \
  --enable-libfdk-aac \
  --enable-libfreetype \
  --enable-libmp3lame \
  --enable-libopus \
  --enable-libvorbis \
  --enable-libvpx \
  --enable-libx264 \
  --enable-libx265 \
  --enable-nonfree \

  make clean
  make
  make install
}

build_arm64-v8a
echo build_arm64-v8a finished


  


  I'm using

  


  


  • ffmpeg-snapshot.tar.bz2

    


  


  • android-ndk-r21d-linux-x86_64

    


  


  


  the only thing i know in 'ndk 21` is we need to use default toolchain (android documentation says).

  


  How to create .sh file to build .so file to use in android ?

  


• Trouble setting up rtmp audio streaming with ffmpeg and nginx

  20 septembre 2021, par igoryonya

  Can't figure out how to set up rtmp streaming with ffmpeg.
I've been trying to figure it out for about 2 weeks now.
I need to stream the default sound from my sound card over rtmp stream.
I don't need a video, only an audio.

  


  So, i've installed nginx with rtmp module and added the following code at the end of my "/etc/nginx/nginx.conf" file :

  


  rtmp {
        server {
                listen 1935;
                application cam1 {
                        live on;
                }
        }
}


  


  restarted my nginx installation :

  


  sudo systemctl status nginx.service


  


  Checked that the 1935 port is listening :

  


  ~$ sudo netstat -nlp|egrep -i 'nginx'
tcp        0      0 0.0.0.0:1935            0.0.0.0:*               LISTEN      1885931/nginx: mast 
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      1885931/nginx: mast 
tcp6       0      0 :::80                   :::*                    LISTEN      1885931/nginx: mast


  


  Launched an ffmpeg to capture my sound card, encode it into ogg format and stream it to the rtmp server (on the same computer with nginx installed) :

  


  ffmpeg -re -f pulse -i default -c:a libvorbis -content_type 'audio/ogg' -vn -f ogg rtmp://127.0.0.1/cam1/test


  


  And it looks like, it's streaming, by showing statistics.

  


  Then, I try to open it with the vlc player to test the stream and the yellow bar on the progress bar just going back and forth and never starts playing.
I tried to use vlc on the same computer and on the computer on the same network.

  


  Assuming, the computer, that is streaming rtmp has an IP : 192.168.0.1, I use the following connection URL in VLC :

  


  rtmp://192.168.0.1/cam1/test