Newest 'ffmpeg' Questions - Stack Overflow

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  • while build a demo about ffmpeg , it occurs : undefined reference to `av_register_all'

    25 février, par Cody

    This problem has bothered me for days.

    After I compile and install FFmpeg, I try to build a demo using it, but it always fails.

    The demo is:

    #include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"

int main(int argc,char *argv[]) {
    av_register_all();
    return 1;
}

    With gcc main.c -o main.o, an error occurs: undefined reference to 'av_register_all'

    Building with: gcc main.c -o main.o -lm -ld -lz -lavcodec -lavformat -lavutil, another error occurs: /usr/bin/ld: cannot find -ld

    How can I resolve this?

  • Animated watermark moving on the edges of the movie - ffmpeg

    25 février, par saeid ezzati

    I wanna overlay a picture on a video, as a watermark. How do I insert an animated watermark that randomly moves from side to side.

    For example, A watermark, placed on top/ upper-left corner, moves randomly to the top/upper-right corner and freezes there for five seconds before moving down to the lower- right corner.

    I don't want the watermark to have a cross movement and move from the upper-right corner to the lower-left corner.

    Here is an example of my code, using which the watermark randomly jumps to a corner each 200 frames without animate:

    ffmpeg -i "source.mp4" -i "watermark.png" -filter_complex "[1:v]scale=50:-1[a]; [0:v][a]overlay=x='st(0,floor(random(n)*2)+1);if(eq(mod(n-1,200),0), if(eq(ld(0),1),0,  main_w-overlay_w   ) ,x)':y='st(0,floor(random(n)*2)+1);if(eq(mod(n-1,200),0),if(eq(ld(0),1),0,  main_h-overlay_h   ),y)'" -codec:a copy "out.mp4"

  • Libav linking error : undefined references

    25 février, par Fedech

    Here's my problem:

    • I built ffmpeg from source (version 1.2), the libav* libraries are in /usr/local/lib and they're static
    • I'm compiling a ns3 (www.nsnam.org) module, so my only control over the linker is through the env variable LINKFLAGS
    • In the source the headers are in a "extern C" block, so it's not the usual g++ name mangling
    • I set LINKFLAGS="-I/usr/local/include/libavformat -I/usr/local/include/libavcodec -I/usr/local/include/libavutil -L/usr/local/lib -lavformat -lavcodec -lavutil", and the linker can't seem to find any of the libav* functions I call (I get a lot of "undefined reference" and then "collect2: error: ld returned status 1"

    Can anyone help me? Thanks...

    edit: here are a few of the undefined reference messages:

        ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_guess_format'
    ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_read_frame'
    ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `avformat_write_header'
    ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_interleaved_write_frame'
    ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_find_stream_info'
    ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_register_all'
    ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_init_packet'
    ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `avformat_alloc_context'
    ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `av_dump_format'
    ./libns3.14.1-qoe-monitor-debug.so: undefined reference to `avio_close'

    edit2: here is the message I get after "build failed":

    -> task in 'scratch-simulator' failed (exit status 1): 
{task 53952272: cxxprogram scratch-simulator.cc.1.o -> scratch-simulator}
['/usr/bin/g++', '-I/usr/local/include/libavcodec', '-I/usr/local/include/libavformat/',
 '-I/usr/local/include/libavutil/', '-L/usr/local/lib', '-I/usr/local
/include/libavcodec', '-I/usr/local/include/libavformat/', '-I/usr/local/include
/libavutil/', '-L/usr/local/lib', '-pthread', '-pthread', '-Wl,-z,relro', 
'scratch/scratch-simulator.cc.1.o', '-o', '/home/fede/Thesis/ns-allinone-3.14.1
/ns-3.14.1/build/scratch/scratch-simulator', '-Wl,-Bstatic', '-Wl,-Bdynamic', 
'-Wl,--no-as-needed', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.',
 '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.',
 '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', 
'-L.', '-L.', '-L.', '-L.', '-L.', '-L/usr/lib', '-lns3.14.1-test-debug', '-lns3.14.1-
csma-layout-debug', '-lns3.14.1-point-to-point-layout-debug', '-lns3.14.1-netanim-
debug', '-lns3.14.1-lte-debug', '-lns3.14.1-spectrum-debug', '-lns3.14.1-antenna-
debug', '-lns3.14.1-aodv-debug', '-lns3.14.1-dsdv-debug', '-lns3.14.1-dsr-debug', 
'-lns3.14.1-mesh-debug', '-lns3.14.1-olsr-debug', '-lns3.14.1-csma-debug', '-lns3.14.1-
wimax-debug', '-lns3.14.1-applications-debug', '-lns3.14.1-virtual-net-device-debug', 
'-lns3.14.1-uan-debug', '-lns3.14.1-energy-debug', '-lns3.14.1-flow-monitor-debug', 
'-lns3.14.1-nix-vector-routing-debug', '-lns3.14.1-tap-bridge-debug', '-lns3.14.1-
visualizer-debug', '-lns3.14.1-internet-debug', '-lns3.14.1-bridge-debug', '-lns3.14.1-
point-to-point-debug', '-lns3.14.1-mpi-debug', '-lns3.14.1-wifi-debug', '-lns3.14.1-
buildings-debug', '-lns3.14.1-propagation-debug', '-lns3.14.1-mobility-debug', 
'-lns3.14.1-config-store-debug', '-lns3.14.1-tools-debug', '-lns3.14.1-stats-debug',
 '-lns3.14.1-emu-debug', '-lns3.14.1-topology-read-debug', '-lns3.14.1-network-debug', 
'-lns3.14.1-qoe-monitor-debug', '-lns3.14.1-core-debug', '-lrt', '-lgsl', 
'-lgslcblas', '-lm', '-ldl', '-lgtk-x11-2.0', '-lgdk-x11-2.0', '-latk-1.0', 
'-lgio-2.0', '-lpangoft2-1.0', '-lpangocairo-1.0', '-lgdk_pixbuf-2.0', '-lcairo', 
'-lpango-1.0', '-lfreetype', '-lfontconfig', '-lgobject-2.0', '-lglib-2.0', '-lxml2', 
'-lpython2.7']

  • PHP convert any video to MP4 using ffmpeg

    25 février, par Dilak

    I have a website in which I allow users to upload videos. But with the HTML5 tag video, only MP4 videos are allowed

    So, I want to convert any type of videos that the users upload to MP4 and then add the path in my database.

    I tried something, changing the file extension to MP4 but it didn't work. I've read something about ffmepg but I can't figure out how to use it.

    Here is my PHP script where I change the file extension and then add the path in my data base, please how can I convert the video correctly, what should I add/change?

    <?php 
    if(file_exists($_FILES['media-vid']['tmp_name']) && is_uploaded_file($_FILES['media-vid']['tmp_name']))
    {
        $targetvid = md5(time());
        $target_dirvid = "videos/";
        $target_filevid =  $targetvid.basename($_FILES["media-vid"]["name"]);
        $uploadOk = 0;
        $videotype = pathinfo($target_filevid,PATHINFO_EXTENSION);
        
        $video_formats = array(
            "mpeg",
            "mp4",
            "mov",
            "wav",
            "avi",
            "dat",
            "flv",
            "3gp"
        );
        foreach ($video_formats as $valid_video_format)
        {
            if (preg_match("/$videotype/i", $valid_video_format)) 
            {
                $target_filevid = $targetvid . basename($_FILES["media-vid"] . ".mp4");
                $uploadOk = 1;
                break;
            } 
            else 
            {
                //if it is an image or another file format it is not accepted
                $format_error = "Invalid Video Format!";
            }
        }

        if ($_FILES["media-vid"]["size"] > 5000000000000)
        {
            $uploadOk = 0;
            echo "Sorry, your file is too large.";
        }

        // Check if $uploadOk is set to 0 by an error
        if ($uploadOk == 0 && isset($format_error))
        {
            echo "Sorry, your video was not uploaded.";
            // if everything is ok, try to upload file
        }
        else if ($uploadOk == 0) 
        {
            echo "Sorry, your video was not uploaded.";
        }
        else
        {
            $target_filevid = strtr($target_filevid,
            'ÀÁÂÃÄÅÇÈÉÊËÌÍÎÏÒÓÔÕÖÙÚÛÜÝàáâãäåçèéêëìíîïðòóôõöùúûüýÿ',
            'AAAAAACEEEEIIIIOOOOOUUUUYaaaaaaceeeeiiiioooooouuuuyy');
            $target_filevid = preg_replace('/([^.a-z0-9]+)/i', '_', $target_filevid);
            if (!move_uploaded_file($_FILES["media-vid"]["tmp_name"], $target_dirvid. $target_filevid))
            {
                echo "Sorry, there was an error uploading your file. Please retry.";
            }
            else
            {
                $vid= $target_dirvid.$target_filevid;
                $nbvid = 1;
            }
        }
    }
?>

    Thank you.

  • How do I record a Selenium Grid Session (Via VNC, Remote Frame Buffer - RFB) to an H264 encoded MP4 [closed]

    25 février, par Frobbit

    When my integration tests fail, I want to be able to watch the video of the test running. I test a full stack app with docker-compose and I use the single container Selenium-grid. If I save every Secenerio to a file, I can quickly review a failed test.

    I'm trying to record a Selenium Grid session and save it as an MP4 file using GStreamer and VNC. I need a solution that captures the VNC session running in the Selenium Grid container and writes the output to an H264 encoded mp4 file.

    Here's the context:

    I'm using Selenium Grid with a VNC server running in the container. I can access the VNC session using the se:vncLocalAddress capability.

    I would like a tool that can record the VNC remote framebuffer (RFB) output.

    Can someone provide a reliable way to record a Selenium Grid session to an MP4 file using a tool like GStreamer or ffmpeg?

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