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• Adding the Transform video filter to ffmpeg

  1er août 2016, par aaeim

  first off I’m new to ffmpeg, and stackoverflow. so sorry If I’m doing something wrong.

  Earlier I commented on a post related to this but it got deleted because it was not an answer or something. So I’m asking my own question here.

  I followed this instructions https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu

  up untill Unzipping the ffmpeg file. Then I followed the facebook instructions

  1. Checkout the source for ffmpeg
  2. Copy vf_transform.c to the libavfilter subdirectory in ffmpeg source
  3. Edit libavfilter/allfilters.c and register the filter by adding the line : REGISTER_FILTER(TRANSFORM, transform, vf) ; in the video filter registration section
  4. Edit libavfilter/Makefile and add the filter to adding the line : OBJS-$(CONFIG_TRANSFORM_FILTER) += vf_transform.o in the filter section
  5. Configure and build ffmpeg as usual

  and finally I ran the remaining instructions from the compilation guide.

  I did the whole process a couple times but The result is always the same when I try to test.

  ffmpeg version N-80901-gfebc862 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  
    configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab
  
    libavutil      55. 28.100 / 55. 28.100
  
    libavcodec     57. 48.101 / 57. 48.101
  
    libavformat    57. 41.100 / 57. 41.100
  
    libavdevice    57.  0.102 / 57.  0.102
  
    libavfilter     6. 47.100 /  6. 47.100
  
    libavresample   3.  0.  0 /  3.  0.  0
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  1.100 /  2.  1.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Unknown filter 'transform'.

  I’m on elementary OS.
  Thx and sorry if the post is all wrong.

• Writing an image to linux framebuffer distorts the image C++

  8 avril 2021, par max

  Im trying to set up rtsp video stream from teledyne Dalsa Genie Nano camera. For grab images I'm using a framework provided by this company.
For rtsp stream I will use ffmpeg tool that can stream video directly from linux frame buffer.
  
So i tried to write this image via memcpy function and at this moment the image is not recorded correctly. because when i try to take a screenshot from Facebook with ffmpeg in output i have corrupted image.
  
Here's some information :

In the framework I have an image object that contains :

  


  

  1. void *address (address of one frame)

  


  2. int width (1280)

  


  3. int height (1024)

  


  4. int depth (1)

  


  


  So I wrote a function :


  


  It's working fine without any errors but when I print image from frame buffer (fb) I have

  


  

  


  I think it happens because fb device depth is 32 but frame depth is 1.

  


  Am I right ?

  


  I tried to change fb device depth with fbset tool but it returns an error -


  


  Command I use for taking an image from fb : sudo ffmpeg -f fbdev -framerate 1 -i /dev/fb0 -frames:v 1 screenAA3.jpeg

  


  Can someone tell me what I'm doing wrong ?

  


• How to setup a video chunker or FFMPEG to bypass Cloudflare ?

  20 avril 2021, par RustyGates

  In full transparency, I am a noob so please forgive my lack of appropriate lingo as I am just barely starting to learn the languages of web development. Hope you don't have to try and decipher too much of what I'm trying to say.

  


  So in an attempt to put this as simply as possible.

  


  I have a PHP Script CMS that I have been doing some extensive custom work to. As mentioned, I am still learning for the most part and while my front end skills are getting very well polished, I'm still completely lose mostly when it comes to back end endeavors. And for reference, the CMS I am using is Wowonder from Codecanyon. It's essentially just a social media cms, like Facebook.

  


  I have this installed on my own dedicated server, have WHM/Cpanel, all that good stuff. I also have my website/domain setup through Cloudflare properly. This is where the issue arises. Cloudflare limits uploads to 100 megabytes. Some of the users on my website will be uploading videos and media much bigger than 100 megabytes. (Up to 10 gigabytes in some cases). I have researched the issue long and hard and it would seem to me the obvious was to resolve the problem would be to use a video chunker (and/or something like FFMPEG ? But not sure if FFMPEG Is capable of it. Am just assuming).

  


  I understand the basic, general idea of what chunkers do and have found some seemingly good options. Will post a couple below just as an example but not necessarily options I was considering.

  


  [https://github.com/blueimp/jQuery-File-Upload][1]

  


  [https://github.com/c0decracker/video-splitter][2]

  


  [https://github.com/appijumbo/video-chunk][3]

  


  So again, I understand the basic idea, it would chunk up the video while uploading (somewhere beneath the 100 megabyte maximum) to bypass Cloudflare's limit, and then stitch the video back together so it's in it's in it's complete form again. However, with a website that has many users uploading, I have not the slightest idea what the best solution is, or if this is the best solution at all, and if it is, how to implement it properly.

  


  I have also installed FFMPEG on my server and did so successfully but not sure how to implement that properly either now how to tell it that it should automatically encode any videos uploaded to the website by any users and so on, nor sure if it's possible to do chunking with it although it seemingly is ?

  


  Any advice is on the topic is much appreciated and I would be much obliged. Thanks in advance.