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• Multiple video sources combined into one

  28 septembre 2011, par Oded

  I am looking for an efficient way to do the following :

  Using several source videos (of approximately the same length), I need to generate an output video that is composed of all of the original sources each running in its own area (like a bunch of PIPs in several different sizes). So, the end result is that all the original are running side-by-side, each in its own area/box.

  The source and output need to be flv and the platform I am using is Windows (dev on Windows 7 64bit, deployment to Windows server 2008).

  I have looked at avisynth but unfortunately it can't handle flv and non of the plugins and flv splitters I have tried worked.

  My current process uses ffmpeg in the following manner :

  1. Use ffmpeg to generate 25 png's per second per video, resizing the original as needed.
  2. Use the System.Drawing namespace to combine each set of frames into a new image, starting with a static background, then loading each frame into an Image and drawing to the background Graphics object - this gives me the combined frames.
  3. Use ffmpeg to combine the generated images to a video.

  All this is very IO intensive (which is my processing bottleneck at the moment) and I feel there must be a more efficient way to reach my goal. I do not have much experience with video processing, and don't know what options are out there.

  Can anyone suggest a more efficient way of processing these ?

• Scheduling an RTMP stream remotely - using an intermediary server for storing + sending video stream packets before deploying to streaming service

  25 février 2020, par hedgehog90

  This is more of a curiosity than something I really need, but I thought I’d ask anyway.

  If I just want setup a normal livestream, I would use something like OBS, capture my input, encode it into something manageable for my network and send it to a remote rtmp server.

  But I’d like to know if it’s possible to put an intermediary remote server between myself and the streaming service’s server. Basically so I can manage the stream (if it’s a playlist) and schedule when to send it to broadcast on the streaming service.

  It’s also worth noting that there may be limited bandwidth on the client-side (my computer), assuming the intermediary has greater bandwidth, this method should eliminate the common issue of dropping frames while streaming.

  Now for an example :

  To make it simpler, instead of using OBS + capture hardware, I’m using a video file.
  I want to encode that video in the same way that OBS does when streaming to a remote server via an rtmp protocol using ffmpeg.

  Now I upload that data, at my own rate, to a remote server that I control (running Ubuntu) for storage and eventual deployment. Importantly, I do not want or require any video-processing done on the intermediary server, as we have already encoded the data for deployment on the client-side. This is just simply managing and storing the data.

  A day later, I want to run a script on my intermediary server that will then send the processed stream data, packet by packet, to the targeted streaming server.

  ---

  I’m an experienced coder, with lots of experience with data handling and video encoding. It should be simple, but I’m not all that clued up on the way video streaming via RTMP works.

• Adding subtitles to video using Laravel FFMpeg

  13 juin 2024, par Pieter van der Mullen

  I've been trying to convert my console command to work with the Laravel FFMpeg package. The issue that I've been running into is that the available Filters are not really well documented.


  This is the Laravel code that is not working. The only part that does not work is the last addFilter part with the srt and font file.

  


              FFMpeg::fromDisk('local')
            ->open([$backgroundImage, $audioFile])
            ->export()
            ->toDisk('local')
            ->addFilter(function (FrameFilters $filters) {
                $filters->custom('scale=1920:1080');
            })
            ->addFormatOutputMapping(
                new X264,
                Media::make('local', $newVideoPath),
                ['0:v', '1:a']
            )
            ->addFilter(function ($filters) use ($srtFile, $fontFile) {
                $filter = "pad=1920:1080:0:0:color=black,subtitles={$srtFile}:force_style='Fontname={$fontFile},Alignment=10,Fontsize=36,BorderStyle=3,Outline=1,OutlineColour=&HFFFFFF&,PrimaryColour=&H008d7f00&'";
                $filters->custom('0:v', '0:v', $filter);
            })
            ->save();


  


  The command which I used to use in the console using Symphony Process was :

  


  '-vf', "pad=1920:1080:0:0:color=black,subtitles=$srtFile:si=0:force_style='Fontname=$fontFile,Alignment=10,Fontsize=36,BorderStyle=3,Outline=1,OutlineColour=&HFFFFFF&,PrimaryColour=&H008d7f00&'"


  


  Is there anyone who has experience doing this ?