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• ERROR : Cannot Autodetect input stream or No signal

  23 juin 2022, par Damián Devera

  I am using Decklink Mini Recorder to capture video (it has SDI and HDMI inputs, tried both).

  


  This is my setup : Debian 10.2.1 (non GUI), ffmpeg 5.0, Blackmagic software 12.3

  


  For that I installed custom build of ffmpeg :

  


  sudo apt-get update -qq && sudo apt-get -y install \
  autoconf \
  automake \
  build-essential \
  cmake \
  git-core \
  libass-dev \
  libmp3lame-dev \
  libfreetype6-dev \
  libtool \
  libvorbis-dev \
  pkg-config \
  texinfo \
  wget \
  zlib1g-dev
sudo apt-get -y install \
  nasm yasm

sudo apt-get install -y libopus-dev
sudo apt-get install -y libvpx-dev
sudo apt-get install -y libx264-dev
sudo apt-get install -y libx265-dev
sudo apt-get install -y libnuma-dev
sudo apt-get install -y libfdk-aac-dev
sudo apt-get install -y libmp3lame-dev

cd ~/ffmpeg_sources && \
git -C fdk-aac pull 2> /dev/null || git clone --depth 1 https://github.com/mstorsjo/fdk-aac && \
cd fdk-aac && \
autoreconf -fiv && \
./configure --prefix="$HOME/ffmpeg_build" --disable-shared && \
make && \
make install



cd ~/ffmpeg_sources
wget https://ffmpeg.org/releases/ffmpeg-4.1.3.tar.bz2
tar -xvf ffmpeg-*.tar.bz2
cd ffmpeg-*/
PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure \
  --prefix="$HOME/ffmpeg_build" \
  --pkg-config-flags="--static" \
  --extra-cflags="-I$HOME/ffmpeg_build/include -I$HOME/ffmpeg_sources/BMD_SDK/include" \
  --extra-ldflags="-L$HOME/ffmpeg_build/lib" \
  --extra-libs="-lpthread -lm" \
  --bindir="$HOME/bin" \
  --enable-gpl \
  --enable-libass \
  --enable-libfdk-aac \
  --enable-libfreetype \
  --enable-libmp3lame \
  --enable-libopus \
  --enable-libvorbis \
  --enable-libvpx \
  --enable-libx264 \
  --enable-libx265 \
  --enable-nonfree \
  --enable-decklink

PATH="$HOME/bin:$PATH" make -j `nproc`
sudo cp ffmpeg ffprobe /usr/local/bin/


  


  I can see my card using Blackmagic softwares for the card and also using ffmpeg -sources decklink.

  


  But when I try to run this : ffmpeg -f decklink -i 'DeckLink Mini Recorder' -t 10 -c:v libx264 -f mp4 test.mp4

  


  I get error : Cannot Autodetect input stream or No signal  DeckLink Mini Recorder: Input/output error

  


  UPDATE 1 : I used new command ffmpeg -y -format_code 23ps -f decklink -i 'DeckLink Mini Recorder' test.mov -report
Now I can run command, but I capture only colour bars.

  


  UPDATE 2 : I used new command ffmpeg -f decklink -video_input hdmi -i ‘DeckLink Mini Recorder’ -t 10 test.mp4
I am now capturing over HDMI.

  


  Now I am trying to use SDI on the card (which is my main target) but running into same problems (using this command : ffmpeg -f decklink -video_input sdi -i ‘DeckLink Mini Recorder’ -t 10 test.mp4). I have HDMI to SDI convertor from BlackMagic (HDMI to SDI 3G). Does anybody know, what is the problem ?

  


• Fast Video Compression on Android

  7 avril 2017, par leap of faith

  I want to upload video files to server and compress before uploading. I’m using ffmpeg libx264. I have seen viber can upload 30 second video file of size 78MB within a minute [reduce it’s down to 2.3MB]. I want to know how do they do it so fast ?

  What I have tried so far -

  FFMPEG version :  n2.4.2 
  
  Built with gcc 4.8
  
  
  
  Build Configuraiton : --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/sb/Source-Code/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/sb/Source-Code/ffmpeg-android/build/armeabi-v7a-neon --extra-cflags='-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -mfpu=neon' --extra-ldflags='-L/home/sb/Source-Code/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=

  Command :

  ffmpeg -y -i /storage/emulated/0/main.mp4 -s 480x320 -r 20 -c:v libx264 -preset ultrafast -c:a copy -me_method zero -tune fastdecode -tune zerolatency -strict -2 -b:v 1000k -pix_fmt yuv420p /storage/emulated/0/output.mp4

  The result so far is, a 30second 78MB file gets compressed to 4.3MB which takes around 1min 28seconds. Here is the console dump - http://pastebin.com/rn81acGx . I mainly want to reduce the time it takes to compress. How can I achieve this ?

  Thanks in advance.

• Fast Video Compression on Android

  7 avril 2017, par leap of faith

  I want to upload video files to server and compress before uploading. I’m using ffmpeg libx264. I have seen viber can upload 30 second video file of size 78MB within a minute [reduce it’s down to 2.3MB]. I want to know how do they do it so fast ?

  What I have tried so far -

  FFMPEG version :  n2.4.2 
  
  Built with gcc 4.8
  
  
  
  Build Configuraiton : --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/sb/Source-Code/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/sb/Source-Code/ffmpeg-android/build/armeabi-v7a-neon --extra-cflags='-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -mfpu=neon' --extra-ldflags='-L/home/sb/Source-Code/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=

  Command :

  ffmpeg -y -i /storage/emulated/0/main.mp4 -s 480x320 -r 20 -c:v libx264 -preset ultrafast -c:a copy -me_method zero -tune fastdecode -tune zerolatency -strict -2 -b:v 1000k -pix_fmt yuv420p /storage/emulated/0/output.mp4

  The result so far is, a 30second 78MB file gets compressed to 4.3MB which takes around 1min 28seconds. Here is the console dump - http://pastebin.com/rn81acGx . I mainly want to reduce the time it takes to compress. How can I achieve this ?

  Thanks in advance.