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• Streaming the output of openCV real-time as an RTSP stream with ffmpeg

  9 mars 2015, par user3916798

  I receive an RTSP video stream from an IP camera into my OpenCV program, which I then process for pedestrian detection ; I now want to send the video comprising of bounding boxes around people detected as an rtsp stream over the network.

  I am trying to use ffmpeg to do this ; I can write the video using OpenCV video writer and also stream video file using ffmpeg as an rtsp stream, but I am unable to do both of this simultaneously so that it is real-time.

  Most search results talk about how to receive an RTSP stream into OpenCV and I have not found much help in this regard.

• Why can't I get a manually modified MPEG-4 extended box (chunk) size to work ?

  15 avril 2019, par Moshe Rubin

  Overview

  As part of a project to write an MPEG-4 (MP4) file parser, I need to understand how an extended box (or chunk) size is processed within an MP4 file. When I tried to manually simulate an MP4 file with an extended box size, media players report that the file is invalid.

  Technical Information

  Paraphrasing the MPEG-4 specification :

  An MP4 file is formed as a series of objects called ’boxes’. All data is contained in boxes, there is no other data within the file.

  Here is a screen capture of Section 4.2 : Object Structure, which describes the box header and its size and type fields :

  

  

  Most MP4 box headers contain two fields : a 32-bit compact box size and a 32-bit box type. The compact box size supports a box’s data up to 4 GB. Occasionally an MP4 box may have more data than that (e.g., a large video file). In this case, the compact box size is set to 1, and eight (8) octets are added immediately following the box type. This 64-bit number is known as the ’extended box size’, and supports a box’s size up to 2^64.

  To understand the extended box size better, I took a simple MP4 file and wanted to modify the moov/trak/mdia box to use the extended box size, rather than the compact size.

  Here is what the MP4 file looks like before modifying it. The three box headers are highlighted in RED :

  

  My plan was as follows :

  1. Modify the moov/trak/mdia box
     • In the moov/trak/mdia, insert eight (8) octets immediately following the box type (’mdia’). This will eventually be our extended box size.
     • Copy the compact box size to the newly-inserted extended box size, adding 8 to the size to compensate for the newly inserted octets. The size is inserted in big-endian order.
     • Set the compact size to 1.
  2. Modify the moov/trak box
     • Add 8 to the existing compact box size (to compensate for the eight octets added to mdia).
  3. Modify the moov box
     • Add 8 to the existing compact box size (again, to compensate for the eight octets in mdia)

  Here’s what the MP4 file looks like now, with the modified octets are in RED :

  

  What have we done ?

  We have told the MP4 parser/player to take the moov/trak/mdia box size from the extended field rather than the compact size field, and have increased all parent boxes by eight (8) to compensate for the newly-inserted extended box size in the mdia box.

  What’s the problem ?

  When I attempt to play the modified MP4 file I receive error messages from different media players :

  

  

  Why do the media players see the modified file as invalid MP4 ?

  • Did I need to alter any other fields ?
  • Does the extended box size have to be greater than 2^32 ?
  • Can it be that only specific box types support extended box size (e.g., Media Data) ?

• Laravel FFMPEG Add HLS Video Watermark issue

  6 juin 2020, par Jefriiyer S

  I'm using "pbmedia/laravel-ffmpeg" : "^7.0" in "laravel/framework" : "^7.0" , I want to add water mark to the HLS video, Here is the example given in the github repo https://github.com/pascalbaljetmedia/laravel-ffmpeg

  



  FFMpeg::open(['video.mp4', 'video2.mp4'])
    ->export()
    ->addFilter(function(ComplexFilters $filters) {
        // $filters->watermark(...);
    });


  



  But It's not have enough information, Here is the working example everyware in the internet

  



  addFilter(function ($filters) {
            $filters->watermark($watermarkPath, [
                'position' => 'relative',
                'bottom' => 50,
                'right' => 50,
            ]);
        })


  



  But the watermark method has 2 more required parameters in the library

  



  addFilter(function (ComplexFilters $filters) {
            $filters->watermark($in,$watermarkPath,$out, [
                'position' => 'relative',
                'bottom' => 50,
                'right' => 50,
            ]);
        })


  



  What should I pass for $in and $out
Here is the full code which I have

  



  $low = (new X264('aac'))->setKiloBitrate(100);
$mid = (new X264('aac'))->setKiloBitrate(250);
$high = (new X264('aac'))->setKiloBitrate(500);


       FFMpeg::fromDisk('local')
        ->open($this->video->path)
        ->exportForHLS()
        ->addFilter(function (ComplexFilters $filters) {
            $filters->watermark(null,public_path('watermark.png'),null, [
                'position' => 'relative',
                'bottom' => 50,
                'right' => 50,
            ]);
        })
        ->addFormat($low)
        ->addFormat($mid)
        ->addFormat($high)
        ->save("public/videos/{$this->video->id}/{$this->video->id}.m3u8");


  



  By passing null I can't able to see any watermark , If I remove those nulls , I'll have error

  



  

  



  Please look at the required parameters in watermark function under ComplexFilters,
Thanks :).