Recherche avancée

Sur d’autres sites (5049)

• FFMPEG - zoompan image in top left corner

  11 novembre 2020, par user3221592

  I can get zoompan to zoom in a dot in the middle of the frame with the standard :

  


  zoompan=z='min(zoom+0.24,10)':x='(iw/2-(iw/zoom/2))':y='ih/2-(ih/zoom/2)'

  


  but I need the dot to appear in the top left of the frame. I have tried any number of combinations of zooms and 'shifts' and the best I could come up with was :

  


  zoompan=z='min(zoom+0.14,10)':x='(iw/2-(iw/zoom/2))+(728/zoom)':y='ih/2-(ih/zoom/2)+(308/zoom)'

  


  BUT for the first 6 frames the dot 'travels' across the frame. No idea why this might be the case. Also the maths(iw/2-(iw/zoom/2)) just doesn't make sense to me to centre the image, I would have thought it would be (iw-(iw*zoom))/2 ?

  


  This works on any 1980x1080 video and I have attached the sample image that I am using along with the full code

  


  ffmpeg -y -i CHORUS_INTRO_VIDEO3.mov -loop 1 -i CentreDot.png -filter_complex "[1:v]zoompan=z='min(zoom+0.14,10)':x='(iw/2-(iw/zoom/2))+(728/zoom)':y='ih/2-(ih/zoom/2)+(308/zoom)':d=150:s=1920x1080[circleOverlay] ;[0:v][circleOverlay]overlay=0:0" -shortest output.mp4


  


• php. ffmpeg. read from input stream. How to ?

  3 décembre 2020, par rzlvmp

  I trying to create mp4 file from looping jpg image. By transfer jpg image as a stdin stream.

  


  $cwd = getcwd();
$env = [];
   
$descriptorspec = array(
    0 => ["pipe", "r"],  // stdin
    1 => ["pipe", "w"],  // stdout
    2 => ["pipe", "w"]   // stderr
);

$transcode_command = 'ffmpeg -y -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -f jpeg_pipe -loop 1 -i pipe:0 -c:v libx264 -r 29.97 -t 30 -pix_fmt yuv420p -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2,setsar=1" -c:a aac -shortest -movflags faststart -f mp4 /tmp/output.mp4';
$process = proc_open($transcode_command, $descriptorspec, $pipes, $cwd, $env);

$s3_client = new Aws\S3\S3Client([
    'calculate_md5' => true,
    'region' => $REGION,
    'version' => 'latest',
    'credentials' => [
        'key'    => $AWS_KEY,
        'secret' => $AWS_SECRET
    ]
]);
$s3_client->registerStreamWrapper();

if (is_resource($process)) {

    $input_stream = fopen('s3://somebucket/image.jpg', 'r');

    if ($input_stream) {

        while (!feof($input_stream)) {
            fwrite($pipes[0], fread($input_stream, 1024));
            fclose($pipes[0]);
        }
        
        $output = stream_get_contents($pipes[1]);
        $error = stream_get_contents($pipes[2]);

        fclose($input_stream);
        fclose($pipes[1]);
        fclose($pipes[2]);

        print_r($output);
        print_r($error);
    }
}


  


  And I've get response

  


  ...
Input #0, lavfi, from 'anullsrc=channel_layout=stereo:sample_rate=44100':
  Duration: N/A, start: 0.000000, bitrate: 705 kb/s
    Stream #0:0: Audio: pcm_u8, 44100 Hz, stereo, u8, 705 kb/s
[mjpeg @ 0xa705a0] EOI missing, emulating
Input #1, jpeg_pipe, from 'pipe:0':
  Duration: N/A, bitrate: N/A
    Stream #1:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 200x200 [SAR 72:72 DAR 1:1], 25 tbr, 25 tbn, 25 tbc
Stream mapping:
  Stream #1:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
  Stream #0:0 -> #0:1 (pcm_u8 (native) -> aac (native))
[mjpeg @ 0xa70c40] overread 8
[mjpeg @ 0xa70c40] EOI missing, emulating
...


  


  Looks like ffmpeg don't wait for stream end (EOI missing, emulating) and trying to create output video after first while iteration. Resulting file is mp4 with one broken frame.
If I set chunk size (1024) bigger than image size, ffmpeg creates only one completed frame.

  


  ffmpeg command working pretty good if I use aws cli (see my answer). But when I try to send input stream via PHP ffmpeg failing.

  


  What problem may be ?..

  


• How to create a script on a Raspberry to run ffmpeg at boot and restart itself if/when ffmpeg fails ?

  5 février 2021, par Mycelium

  I'm using a Raspberry Pi Zero to stream to YouTube using FFMPEG. It works great so far and now I'd like to set it up to run the stream/FFMPEG daily and automatically from 6am to 7pm and restart itself in case it fails.

  


  I've heard/read of people doing so with Python, but I haven't been able to find examples to try. I've never used Python (or any other) before, I'm a complete beginner. All I know is how/where to place the script file to make it run at boot.

  


  Could anyone point me in the right direction on how to achieve this ? The FFMPEG command is as follows :

  


  v4l2-ctl --set-fmt-video=width=1280,height=720,pixelformat=4 
v4l2-ctl --set-ctrl=rotate=180
v4l2-ctl --overlay=1
v4l2-ctl -p 30
v4l2-ctl --set-ctrl=video_bitrate=2000000
ffmpeg -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -i /dev/zero -f h264 -framerate 30 -i /dev/video0 -vcodec copy -acodec aac -ab 128k -g 60 -f flv -r 30 rtmp://a.rtmp.youtube.com/live2/SECRET-KEY