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• ffmpeg crashing server working with fpm-php

  1er janvier 2023, par John

  I'm running a wordpress bitnami stack consisting of apache, mariadb and fpm-php.
I have cron jobs fulfilling encoding of one video at a time using ffmpeg, so while fpm-php is serving http requests ffmpeg works in parallel encoding videos.
When encoding starts everything seems to work fine, as shown here :

  


  But eventually after around an hour the server crashes due to lack of memory space. I've read that when CPU can't handle ffmpeg, ffmpeg will start consuming RAM until it exhausts it so that might be what causes the sudden spike in memory usage.

  


  The image bellow illustrates what happens when the server crashes, kswapd0 creates virtual memory out of disk space to cope with lack of memory :


  


  The server has 4vCPU and 8GB RAM. Website traffic is just me and a colleague, so it should be able to handle ffmpeg taking up around 1vCPU to encode videos.

  


  I use the following configuration for fpm-php :

  


  pm=ondemand
pm.max_children=5
pm.start_servers=2
pm.min_spare_servers=1
pm.max_spare_servers=3
pm.max_requests = 500


  


  Has anyone had this issue before ?

  


  Thank you.

  


  I've tried changing around the configuration of fpm-php, but the issue still happens. I don't see how ffpmeg can crash the server when it's taking up about 25% of the CPU only, when there's no traffic to the server.

  


• How to decouple between ffmpeg and rtp server ?

  2 février 2023, par dror

  I have a ffmpeg-based worker that handles video-generation jobs at very high throughput.
Long videos need to be streamed while being generated.

  


  For that purpose, I have introduced a WebRTC server named Janus-Gateway with its streaming plugin, and set the application's output to an rtp:// endpoint at that server (ffmpeg can stream a single stream using the ​RTP protocol).

  


  In order to avoid buffering problems on the other hand, the streaming is done through the ffmpeg's -re option, which means that the stream will be streamed in real-time, i.e. it slows it down to simulate live streaming.

  


  [ffmpeg-based app] (#1)--> [rtp://janus:port @ webrtc server] (#2)--> [webrtc subscribers]


  


  How can I continue processing video jobs at high throughput while streaming the results at real-time speed ? I need somehow to decouple ffmpeg output (stage #1) so that consumers at stage #2 get streams at natural playback speed.

  


• SVT-AV1 Emscripten build

  24 février 2023, par Yoz

  I am trying to build svt-av1 v1.4.1 for ffmpeg with emscripten 3.1.32. I have followed Build-Guide and ended up with the following command :

  


  cd Build

BUILD_DIR=/home/jozefchutka/ffmpeg-wasm/build/
TOOLCHAIN_FILE=$EMSDK/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake

emmake cmake .. -G"Unix Makefiles" -DCMAKE_INSTALL_PREFIX=$BUILD_DIR -DCMAKE_TOOLCHAIN_FILE=$TOOLCHAIN_FILE -DBUILD_SHARED_LIBS=OFF -DCMAKE_BUILD_TYPE=Release -DBUILD_TESTING=OFF -DCMAKE_HAVE_LIBC_PTHREAD=On -DCMAKE_C_FLAGS="-O3 -I/home/jozefchutka/ffmpeg-wasm/build/include -s USE_PTHREADS=1 -msimd128"

emmake make -j


  


  however the process fails on :

  


  ...
[ 95%] Building C object Source/App/EncApp/CMakeFiles/SvtAv1EncApp.dir/EbTime.c.o
[ 96%] Linking C executable ../../../../Bin/Release/SvtAv1EncApp.js
emcc: error: noexecstack: No such file or directory ("noexecstack" was expected to be an input file, based on the commandline arguments provided)
make[2]: *** [Source/App/EncApp/CMakeFiles/SvtAv1EncApp.dir/build.make:213: ../Bin/Release/SvtAv1EncApp.js] Error 1
make[1]: *** [CMakeFiles/Makefile2:574: Source/App/EncApp/CMakeFiles/SvtAv1EncApp.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....


  


  Generated build.make and link.txt which contains some relevant info.

  


  211: ../Bin/Release/SvtAv1EncApp.js: Source/App/EncApp/CMakeFiles/SvtAv1EncApp.dir/link.txt
212:    @$(CMAKE_COMMAND) -E cmake_echo_color --switch=$(COLOR) --green --bold --progress-dir=/home/jozefchutka/ffmpeg-wasm/modules/svtav1/Build/CMakeFiles --progress-num=$(CMAKE_PROGRESS_8) "Linking C executable ../../../../Bin/Release/SvtAv1EncApp.js"
213:    cd /home/jozefchutka/ffmpeg-wasm/modules/svtav1/Build/Source/App/EncApp && $(CMAKE_COMMAND) -E cmake_link_script CMakeFiles/SvtAv1EncApp.dir/link.txt --verbose=$(VERBOSE)


  


  /home/jozefchutka/ffmpeg-wasm/modules/emsdk/upstream/emscripten/emcc -O3 -I/home/jozefchutka/ffmpeg-wasm/build/include -s USE_PTHREADS=1 -msimd128 -O3 -DNDEBUG  -z noexecstack -z relro -z now @CMakeFiles/SvtAv1EncApp.dir/objects1.rsp -o ../../../../Bin/Release/SvtAv1EncApp.js @CMakeFiles/SvtAv1EncApp.dir/linklibs.rsp


  


  As I am not fluent in c/c++ and related build stack, I am not sure if the problem is my build misconfiguration, svt-av1 sources or emscripten.

  


  Please help me resolve the issue or at least identify the cause, so I can continue in relevant issue tracker.