Recherche avancée

Sur d’autres sites (10235)

• The fdsink element in GStreamer cannot be used to output the correct byte-stream to the pipeline

  21 avril 2022, par yuniversi

  Because I need to output the RTSP stream pulled from the GStreamer command line to my Python program, I use the fdsink element to output the byte-stream from the pipeline.
The video can be displayed correctly by using the xvimagesink element. The command line is as follows.

  


  gst-launch-1.0 rtspsrc location=rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4 ! queue2 ! rtph264depay ! capsfilter caps="video/x-h264, width=240, height=160" ! avdec_h264 ! videoconvert ! xvimagesink


  


  Correct video :


  


  Then I use fdsink instead of the xvimagesink element to output the byte stream from the pipeline and play it with ffplay. It can't display correct video. The command line is as follows.

  


  gst-launch-1.0 rtspsrc location=rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4 ! queue2 ! rtph264depay ! capsfilter caps="video/x-h264, width=240, height=160" ! avdec_h264 ! videoconvert ! fdsink | ffplay -f rawvideo -pixel_format rgb24 -video_size 240*160 -i -


  


  Wrong video :

  


  So is fdsink element wrong or other elements wrong ? Thank you for taking the time to help me solve the problem

  


• avformat/matroskadec : fix setting channel layout using the Channels element

  4 juillet 2022, par James Almer

  avformat/matroskadec : fix setting channel layout using the Channels element
  If the stream's channel layout is first set into a native layout using codec
  
  private parameters, this code here could potentially result in an invalid
  
  native layout where popcnt(ch_layout.u.mask) != ch_layout.nb_channels being
  
  propagated.
  Fixes : Timeout printing a billion channels
  
  Fixes : 48099/clusterfuzz-testcase-minimized-ffmpeg_dem_MATROSKA_fuzzer-6754782204788736
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
  
  Tested-by : Michael Niedermayer <michael@niedermayer.cc>
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavformat/matroskadec.c

• Laravel php timelapse an UploadedFile video element, without saving it as a file

  24 août 2022, par The Blind Hawk

  I want to be able to change the frame rate of a video from 0.05fps to 3fps.
  
I receive the video as an Illuminate\Http\UploadedFile element, with mp4 format, how do I speed up its frame rate before sending it via email ?
  
The video is 25 minutes long, it should become 25 seconds long after changing the frame rate.
  
Is there a way to change the fps without saving the element as a File ?
  
I was planning to use the ffmpeg repository here but it requires me to save both the initial file, and the second file after changing the fps.

  
This is my code :

  


  <?php

namespace Server\Mail;

use Carbon\Carbon;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;
use Illuminate\Http\UploadedFile;

class TimeLapse extends Mailable
{
    use Queueable, SerializesModels;

    public UploadedFile $video;

    public bool $is_timelapsed;

    public string $format;

    /**
     * Create a new message instance.
     */
    public function __construct(
        UploadedFile $video, 
        bool $is_timelapsed, 
        string $format
    ){
        $this->video = $video;
        $this->is_timelapsed = $is_timelapsed;
        $this->format = $format;
    }

    private function timelapse(){
        // here I want to change $video element's fps from 0.05 to 3
    }

    /**
     * Build the message.
     *
     * @return $this
     */
    public function build()
    {
        if ( !$is_timelapsed ) { timelapse(); }

        $this->subject('message')
                    ->text('emails.timelapse');

        $this->attach($this->video, [
            'as' => 'sample'.$format,
            'mime' => 'video/'.$format,
        ]);

        return $this;
    }
}