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• avcodec/vvcdec : refact, rename !is_mvp to check_mer

  22 février 2024, par Nuo Mi

  avcodec/vvcdec : refact, rename !is_mvp to check_mer
  For IBC, we'll utilize the check_available function.
  
  However, neither MVP nor merge mode need to check the motion estimation region.
  
  Let's rename it to avoid confusion.
  

  • [DH] libavcodec/vvc/vvc_mvs.c

• libx264 : Update ROI behaviour to match documentation

  4 juin 2019, par Mark Thompson

  libx264 : Update ROI behaviour to match documentation
  Fix the quantisation offset - use the whole range, and don't change the
  
  offset size based on bit depth.
  Iterate the list in reverse order.  The first region in the list is the one
  
  that applies in the case of overlapping regions.
  

  • [DH] libavcodec/libx264.c

• 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 ?..