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• To concat two videos, one of which is the first video webcam recorder and the other is the normal video(Mp4) using ffmpeg

  8 décembre 2020, par Zargam Husayn

  Two videos have to be join in which the first video is a webcam recorder and the other is a normal video in which the first video I set up plays correctly but the second video does not play, only the audio is heard.

  


   foreach ($video as $value) {
            exec("ffmpeg -i ".$this->APP_PATH.$value." -c:v libx264 -c:a aac -b:a 192k ".$this->TEMP_PATH.++$this->temp_file.".mp4");
            exec("ffmpeg -i ".$this->TEMP_PATH.$this->temp_file.".mp4 -c:a aac -ar 48000 -ac 2 -c:v copy -video_track_timescale 600 ".$this->TEMP_PATH.++$this->temp_file.".mp4");
            $text .= "file '".$this->TEMP_PATH.$this->temp_file.".mp4'\n";
        }
        
        $file = $this->TEMP_PATH.++$this->temp_file.".txt";
        //chmod($this->TEMP_PATH, 0777);
        file_put_contents($file,$text);
        chmod($file, 0777);

        Log::info(" ********** file paths ********** ".$text);

        exec("ffmpeg -safe 0 -f concat -i ".$file." -c copy ".$this->TEMP_PATH.$this->final);


  


• FFMPEG Video to still images and back to video loss less

  4 novembre 2012, par Rigoni

  I'm trying to extract image from an uncompressed AVI video using ffmpeg with the command :

      ffmpeg -i sorce.avi -f image2 -pix_fmt bgr24 images/%1d.bmp

  All is ok, but now I need to revert these images back to a video file.
  I'm trying using this command :

      ffmpeg -f image2 -r 24 -i marked/%1d.bmp -y -vcodec ffv1 -pix_fmt bgr24 test.avi

  But, the output video is compressed and with bad quality.

  Is there any way to extract the images in RGB format and than back to a lossless video ?

  I also tryed to use -vcodec rawvideo, but the quality still bad.

  Best regards.

• Subtitles aren't being burnt into the video | embedding srt into video frames [closed]

  29 février 2024, par X3R0

  Describe the bug

  


  I'm trying to burn a subtitles.srt file onto the video (having the subtitle embeded within the frames themselves)

  


  To Reproduce

  


  both `input.mp4` and `subtitles.srt` are available to the WASM FFMPEG FS
const converted = await ffmpegRef.current.exec([
    '-i', "input.mp4", // Input File
    '-i', 'subtitles.srt',  // Burn subtitles into video
    '-vf', 'subtitles=subtitles.srt',  // Burn subtitles into video
    "output.mp4" // Output File
]);


  


  Expected behavior

  


  The Subtitles should be burned into the video.

  


  Desktop :

  


  

  • OS : Windows 10

  


  • Browser Chrome

  


  • Version 122.0.6261.94 (Official Build) (64-bit) (cohort : M122 Rollout)

  


  


  Additional context

  


  Example extract from the subtitles.srt file

  


  1
00:00:00,280 --> 00:00:01,379
Hi,

2
00:00:01,379 --> 00:00:01,679
and

3
00:00:01,679 --> 00:00:01,980
welcome

4
00:00:01,980 --> 00:00:02,200
to

5
00:00:02,200 --> 00:00:03,220
ClipDrop.

6
00:00:03,799 --> 00:00:03,919
Congratulations

7
00:00:03,919 --> 00:00:04,400
on

8
00:00:04,400 --> 00:00:04,719
being

9
00:00:04,719 --> 00:00:05,040
selected

10
00:00:05,040 --> 00:00:05,259
to

11
00:00:05,259 --> 00:00:05,480
do