Sur d’autres sites (9390)

• ffmpeg performance with hundreds of cuts (atrim)

  25 mai 2021, par drakon

  I have audio files (think 2h) where I want to cut out a lot of pieces out of it (500+) and a ffmpeg command like this one :

  


  ['ffmpeg', '-i', 'pipe:', '-filter_complex', 
'[0]atrim=end=30.69:start=0.0[s0];
 [0]atrim=end=34.31:start=31.18[s1];
 [0]atrim=end=38.65:start=34.43[s2]; 
 (... hundreds more)
 [s37][s38][s39][s40][s41]concat=a=1:n=42:v=0[s42]', '-map', '[s42]']


  


  Stream mapping built with ffmpeg-python :

  


    Stream #0:0 (mp3float) -> atrim
  (... hundreds more)
  Stream #0:0 (mp3float) -> atrim
  concat -> Stream #0:0 (libmp3lame)


  


  Now this works as expected but it takes locally something like 10mins for the files I have and when I deploy it to some server in the cloud it takes something like an hour. It definitely depends on the machine obviously and I definitely scale there the speed but I'd also like to know if there's a way to speed up the processing with ffmpeg itself.

  


  Thanks for any pointers !

  


• Terminal command to upgrade FFMPEG

  14 avril 2023, par Savvy Turtle

  Everything is still installed but once I upgraded my server from CentOS 7.6 to Cloud Linux FFMPEG does not seem to work anymore.

  


  When I go and debug it in the admin section where you upload a test video and hit debug it shows a toast to upload a video. and on the front end of https://turtle.tube/ users upload a video and it gets stuck at 100% upload and processed.

  


  So I'm wondering whether I need to ugrade FFMPEG to work with Cloud Linux update or If I need to restart it.

  


  Any help would be great thanks.

  


  Savvy

  


  Checked Version, looked for terminal command to upgrade FFMPEG to latest stable release of : FFmpeg 5.1.3 "Riemann" or FFmpeg 6.0 "Von Neumann" but have not figured out the command to upgrade yet.

  


  nor the command to restart FFMPEG if that even exist.

  


  Current version of FFMPEG shows :

  


  ffmpeg -version

  


  ffmpeg version 3.4.12 Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-44)
configuration : —prefix=/usr —bindir=/usr/bin —datadir=/usr/share/ffmpeg —docdir=/usr/share/doc/ffmpeg —incdir=/usr/include/ffmpeg —libdir=/usr/lib64 —mandir=/usr/share/man —arch=x86_64 —optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong —param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' —extra-ldflags='-Wl,-z,relro ' —extra-cflags=' ' —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libvo-amrwbenc —enable-version3 —enable-bzlib —disable-crystalhd —enable-fontconfig —enable-gcrypt —enable-gnutls —enable-ladspa —enable-libass —enable-libbluray —enable-libcdio —enable-libdrm —enable-indev=jack —enable-libfreetype —enable-libfribidi —enable-libgsm —enable-libmp3lame —enable-nvenc —enable-openal —enable-opencl —enable-opengl —enable-libopenjpeg —enable-libopus —disable-encoder=libopus —enable-libpulse —enable-librsvg —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libvorbis —enable-libv4l2 —enable-libvidstab —enable-libvpx —enable-libx264 —enable-libx265 —enable-libxvid —enable-libzvbi —enable-avfilter —enable-avresample —enable-libmodplug —enable-postproc —enable-pthreads —disable-static —enable-shared —enable-gpl —disable-debug —disable-stripping —shlibdir=/usr/lib64 —enable-libmfx —enable-runtime-cpudetect
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libavresample 3. 7. 0 / 3. 7. 0
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100

  


• GStreamer x264enc Buffered Frames are Sped-Up after EOS Event

  31 janvier 2024, par user21956843

  After sending EOS, the encoder sends its buffered frames down the pipeline, but the playback of those last 2s of footage is sped up.

  


  Pipeline :

  


  autovideosrc [avfvideosrc] ! clockoverlay ! videoconvert ! video/x-raw,format=I420 !
x264enc bframes=0 bitrate=512 ! video/x-264,stream-format=avc,alignment=au,framerate=20/1 ! kvssink


  


  The application plays the pipeline for 10s, then sends an EOS event on the source element. The custom sink kvssink streams frames to cloud storage, the playback of this 10s of footage is fine except for the encoder's 2s of buffered frames that were sent out after the EOS event being sped up. How can I correct this ?