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• Can I keep a persistent RTP connection in Python3 which forwards incoming mpegts segment files ?

  20 novembre 2024, par Eric Liang

  I've been experimenting with ways to implement an live-streaming HTTP server in Python 3.13 (GIL-disabled) which gradually receives .ts segment files every 1 second in order through PUT requests, saves them temporarily and locally, and delivers the segment files in the same order to a destination which accepts .ts segment files, necessarily through a single persistent connection to the destination.

  


  I have started trying it out with RTP as the protocol, but I've been struggling to keep the connection alive with ffmpeg as I seem to only be able to send 1 segment at a time (which requires a connection restart every time), or send all at once through concat demuxer. I've also experimented with the input to ffmpeg as a pipe, but that also seems to close immediately upon flushing the pipe with new input once. Other specs include not needing to re-encode so using the option -c copy is fine, the connection should persist even if idle, and I cannot use HLS push to the destination.

  


  Is there a way to do this ? (Lastly, because it's GIL-disabled, I also want to leverage that feature to minimize latency.)

  


• How to convert video formats of av3 to wmv/mpeg using FFMPEG

  5 août 2022, par Nandha

  I'm trying to convert a av3 format video into wmv format to allow it be playable in web browser. To do the conversion I'm using FFMPEG to create thumbnail & low res wmv file. But I'm getting the below errors. I have the AVHash for the video file as well.

  


  Video codec using MediaInfo

  


  

  


  FFMPEG version & libraries

  


  

  


  Followings are the different options I tried,

  


  1st command


  


  


  [root@dems-otmm Installer]# ffmpeg -i oja00039_20191218070243e0_20191218070113_01_000v.av3 -f framehash out.sha256
ffmpeg version 4.2.6 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 8 (GCC)
  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 -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection' --extra-ldflags='-Wl,-z,relro -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld ' --extra-cflags=' ' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-fontconfig --enable-frei0r --enable-gcrypt --enable-gnutls --enable-ladspa --enable-libaom --enable-libdav1d --enable-libass --enable-libbluray --enable-libcdio --enable-libdrm --enable-libjack --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmp3lame --enable-nvenc --enable-openal --enable-opencl --enable-opengl --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librsvg --enable-libsrt --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-version3 --enable-vapoursynth --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --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      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x564ccd01ef00] invalid STSD entries 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x564ccd01ef00] error reading header
oja00039_20191218070243e0_20191218070113_01_000v.av3: Invalid data found when processing input

  


  


  



  2nd command

  


  


  


  [root@dems-otmm Installer]# ffmpeg -loglevel warning -y -i oja00039_20191218070243e0_20191218070113_01_000v.av3 -r 1/10 -vf scale='min(500,iw)':-2 -f image2 oja00039_20191218070243e0_20191218070113_01_000v%4d.jpg -vf scale='min(640,iw)':-2 -r 29.97 -b:v 800000 -b:a 96000 -ar 48000 oja00039_20191218070243e0_20191218070113_01_000v.wmv
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x5631fc2bd140] invalid STSD entries 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x5631fc2bd140] error reading header
oja00039_20191218070243e0_20191218070113_01_000v.av3: Invalid data found when processing input
[root@dems-otmm Installer]#

  


  


  



  And few others, but with everything I'm getting the same errors attached below,

  


  


  


  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x5631fc2bd140] invalid STSD entries 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x5631fc2bd140] error reading header
oja00039_20191218070243e0_20191218070113_01_000v.av3: Invalid data found when processing input

  


  


  



• How to change ffmpeg -threads settings [migrated]

  5 août 2014, par Jacob

  Working on a tube site. I’m running videos through ffmpeg on a linux dedicated server to convert to mp4.

  The server specs :

  Architecture:          x86_64
  
  CPU op-mode(s):        32-bit, 64-bit
  
  Byte Order:            Little Endian
  
  CPU(s):                8
  
  On-line CPU(s) list:   0-7
  
  Thread(s) per core:    2
  
  Core(s) per socket:    4
  
  Socket(s):             1
  
  NUMA node(s):          1
  
  Vendor ID:             GenuineIntel
  
  CPU family:            6
  
  Model:                 60
  
  Stepping:              3
  
  CPU MHz:               3491.749
  
  BogoMIPS:              6983.49
  
  Virtualization:        VT-x
  
  L1d cache:             32K
  
  L1i cache:             32K
  
  L2 cache:              256K
  
  L3 cache:              8192K
  
  NUMA node0 CPU(s):     0-7

  Issue during testing is that even only doing 4-5 at once, the server load skyrockets to an average of around 36. This is just a single person. I imagine when it opens, many people will be uploading at once.

  It seems ffmpeg tries to use all the resources available per conversion.

  I’ve heard there’s a -threads setting you can change, but I cannot find it. I have an 8 cpu server. It’s only used for conversions, so I’ve heard the best setting would be between 2 and 4. I can test it out.

  But how do I change this setting ? Everything I see online discusses this setting, but not the steps to change it.