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  • ffmpeg not returning duration, cant play video until complete. Stream images 2 video via PHP

    17 février 2014, par John J

    I am real struggling with ffmpeg. I am trying to convert images to video, I have an ip camera which I am recording from. The recordings are mjpegs 1 frame per image.

    I am trying to create a script in php so I can recreate a video from date to date, this requires inputting the images via image2pipe and then creating the video.

    The trouble is, ffmpeg does return the duration and start stats, so I have no way of working out when the video is done or what percentage is done. The video won't play until its finished, and its not a very good UE.

    Any ideas of how I can resolve this, the video format can be anything I am open to suggestions.

    PHP:

    //Shell command
exec('cat /image/dir/*.jpg | ffmpeg -y -c:v mjpeg -f image2pipe -r 10 -i - -c:v libx264 -pix_fmt yuv420p -movflags +faststart myvids/vidname.mp4 1>vidname.txt 2>&1')

//This is loaded via javascript when the video is loaded (which is failing due to stats being wrong
$video_play = "";

    Javascript:

    //Javascript to create the loop until video is loaded
<script>
    
           $(document).ready(function() {
    
                var loader = $("#clip_load").percentageLoader();
    
                $.ajaxSetup({ cache: false }); // This part addresses an IE bug. without it, IE will only load the first number and will never refresh
    
                var interval = setInterval(updateProgress,1000);
    
                function updateProgress(){ $.get( "&#39;.base_url().&#39;video/getVideoCompile_Process?l=&#39;.$vid_name.&#39;-output.txt&amp;t=per", function( data ) { if(data=>\&#39;100\&#39;){ $("#clip_load").html(\&#39;&#39;.$video_play.&#39;\&#39;); clearInterval(interval); }else{loader.setProgress(data); } });                    }
    
            });
    
            </script>

    PHP (page is called via javascript:

    //This is the script which returns the current percentage
$logloc = $this->input->get('l');
$content = @file_get_contents($logloc);

if($content){
    //get duration of source
    preg_match("/Duration: (.*?), start:/", $content, $matches);

    $rawDuration = $matches[1];

    //rawDuration is in 00:00:00.00 format. This converts it to seconds.
    $ar = array_reverse(explode(":", $rawDuration));
    $duration = floatval($ar[0]);
    if (!empty($ar[1])) $duration += intval($ar[1]) * 60;
    if (!empty($ar[2])) $duration += intval($ar[2]) * 60 * 60;

    //get the time in the file that is already encoded
    preg_match_all("/time=(.*?) bitrate/", $content, $matches);

    $rawTime = array_pop($matches);

    //this is needed if there is more than one match
    if (is_array($rawTime)){$rawTime = array_pop($rawTime);}

    //rawTime is in 00:00:00.00 format. This converts it to seconds.
    $ar = array_reverse(explode(":", $rawTime));
    $time = floatval($ar[0]);
    if (!empty($ar[1])) $time += intval($ar[1]) * 60;
    if (!empty($ar[2])) $time += intval($ar[2]) * 60 * 60;

    //calculate the progress
    $progress = round(($time/$duration) * 100);
    if ($this->input->get('t')=='per'){
        echo $progress;
    }else{
            echo "Duration: " . $duration . "
    ";
            echo "Current Time: " . $time . "
    ";
    echo "Progress: " . $progress . "%";}
}else{ echo "cannot locate";}

    Thanks

  • Get Stream and save as jpeg (image) file from IP Camera using ffmpeg

    17 février 2014, par Mustafa Ekici

    How i can get stream from Ip Camera, Its using RTP, stream is MPEG4, i have multicast address and port,and i have ip camera's IP address and Port Number.
    And I cant reach via http forexample (http://ip/jpeg) And I cant reach stream with VLC Player too. forexample (rtp://ipadressofcam:port) and (rtp://multicastaddress:port)
    So What is ffmpeg command of that?
    I have windows OS, I only write code with C# right now.
    But producer created their own ocx which used for viewing cam,that plugin can work on .net but i dont want to use it becouse it doesnt have much funcionality, I mean you cant get current picture or snapshot of cams, thats why i have to do it myself.

  • Terminating a c function

    17 février 2014, par dempap

    I want to make a function in c, that will capture video under Linux. I embedded ffmpeg command via system() in my c program, which captures video. ffmpeg terminates by pressing [q]. How can I include termination into my c program.

    This function is part of a server.c program. When client requests for termination, I want video cature function to terminate. Is this possible?

    #include
#include 


main()
{

char command[180];

sprintf(command, "ffmpeg -f v4l2 -r 25 -s 640x480 -i /dev/video0 out.avi");
system(command);

}

  • how to convert videos to flv using ffmpeg in php ?

    17 février 2014, par Patrioticcow

    i am trying to convert some different video formats to flv using ffmpeg. But it seems that only some videos go through.

    ffmpeg -i /var/www/tmp/91640.avi -ar 22050 -ab 32 -f flv /var/www/videos/91640.flv

    here is some debug info:

    Seems stream 0 codec frame rate differs from container frame rate: 23.98 (65535/2733) -> 23.98 (5000000/208541)
Input #0, avi, from '/var/www/tmp/91640.avi':
  Duration: 00:01:12.82, start: 0.000000, bitrate: 5022 kb/s
    Stream #0.0: Video: mpeg4, yuv420p, 1280x528 [PAR 1:1 DAR 80:33], 23.98 tbr, 23.98 tbn, 23.98 tbc
    Stream #0.1: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
WARNING: The bitrate parameter is set too low. It takes bits/s as argument, not kbits/s
Output #0, flv, to '/var/www/videos/91640.flv':
    Stream #0.0: Video: flv, yuv420p, 1280x528 [PAR 1:1 DAR 80:33], q=2-31, 200 kb/s, 90k tbn, 23.98 tbc
    Stream #0.1: Audio: adpcm_swf, 22050 Hz, 5.1, s16, 0 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
Error while opening codec for output stream #0.1 - maybe incorrect parameters such as bit_rate, rate, width or height

    also, if i try to grab one frame ad convert it to jpeg i get an error as well

    ffmpeg -i /var/www/tmp/91640.avi -an -ss 00:00:03 -t 00:00:01 -r 1 -y /var/www/videos/91640.jpg

    debug info 

    ...
[mpeg4 @ 0x1d7d810]Invalid and inefficient vfw-avi packed B frames detected
av_interleaved_write_frame(): I/O error occurred
Usually that means that input file is truncated and/or corrupted.

    im thinking that the image fails because the video conversion failed in the first place, not sure though

    any ideas what goes wrong?

  • Determine if OpenCV has FFMpeg Support at Configuration Time

    17 février 2014, par archgoon

    I'm building my project with CMake, but I want to throw an error if OPENCV has not been compiled with FFMPEG support (as this will prevent a large amount of functinoality of my application). How can I modify my CMake scripts to check for this?

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