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• lavu/hwcontext_vulkan : support mapping VUYX, P012, and XV36

  20 août 2022, par Philip Langdale

  lavu/hwcontext_vulkan : support mapping VUYX, P012, and XV36
  If we want to be able to map between VAAPI and Vulkan (to do Vulkan
  
  filtering), we need to have matching formats on each side.
  The mappings here are not exact. In the same way that P010 is still
  
  mapped to full 16 bit formats, P012 has to be mapped that way as well.
  Similarly, VUYX has to be mapped to an alpha-equipped format, and XV36
  
  has to be mapped to a fully 16bit alpha-equipped format.
  While Vulkan seems to fundamentally lack formats with an undefined,
  
  but physically present, alpha channel, it has have 10X6 and 12X4
  
  formats that you could imagine using for P010, P012 and XV36, but these
  
  formats don't support the STORAGE usage flag. Today, hwcontext_vulkan
  
  requires all formats to be storable because it wants to be able to use
  
  them to create writable images. Until that changes, which might happen,
  
  we have to restrict the set of formats we use.
  Finally, when mapping a Vulkan image back to vaapi, I observed that
  
  the VK_FORMAT_R16G16B16A16_UNORM format we have to use for XV36 going
  
  to Vulkan is mapped to Y416 when going to vaapi (which makes sense as
  
  it's the exact matching format) so I had to add an entry for it even
  
  though we don't use it directly.
  

  • [DH] libavutil/hwcontext_vulkan.c
  • [DH] libavutil/version.h

• PHP HTML5 compatible MP4 video using FFMPEG

  9 août 2013, par Annie

  Hi I am using FFMPEG to convert the uploaded video with PHP.

  echo "conversion exercise started...<br /><br />";
  
  
  
  /* looping through all files in the directory */
  
  if ($handle = opendir(&#39;assets/uploaded_videos&#39;)) {
  
      while (false !== ($entry = readdir($handle))) {
  
  
  
          /* filtering the desired extensions */
  
          if ($entry != "." &amp;&amp; $entry != ".." &amp;&amp; in_array(substr($entry, strrpos($entry, &#39;.&#39;)), array(".wmv", ".mpg", ".mpeg", ".flv", ".ogg", ".mp4")))
  
          {
  
              $filename = substr($entry, 0, strrpos($entry, &#39;.&#39;));
  
  
  
              //$command = "ffmpeg -i assets/uploaded_videos/$entry -vcodec libx264 assetss/videos/$filename.mp4";
  
  
  
              $command = "ffmpeg -i assets/uploaded_videos/$entry -vcodec mpeg4 -acodec libfaac files/videos/$filename.mp4";
  
  
  
              echo $command."<br />";
  
  
  
              shell_exec($command."> /dev/null 2>/dev/null &amp;");
  
          }
  
      }
  
      closedir($handle);
  
  }

  I have embedded the player in view file like this :

  <video width="350" poster="&lt;?php echo $first_video[&#39;thumb_path&#39;];?>" controls="controls">
  
      <source src="&lt;?php echo $first_video[&#39;video_path&#39;]; ?>"></source>
  
      <span></span>
  
  </video>

  Now, when I run in IE10, the player gives me invalid source error. I am having this issue with both libx264 and mpeg4 MP4 codecs.

  Any ideas whats going wrong ?

  Update

  Following Ian's direction, I finally get it working. I have used baseline-level3 profile with libx264. You can provide extra parameters but I guess profile is the key ! I experimented couple of profiles and observed that all HTML5 videos on vimeo and youtube use this baseline L3 profile.

  Anyone struggling with MP4 can consider the following command for conversion :

  /* following command converted all my uploaded *.wmv files to mp4 */
  
  $command = "ffmpeg -i files/uploaded_videos/$entry -vcodec libx264 -profile:v baseline -level 3 files/videos/$filename.mp4";

• ffmpeg/ffprobe input as buffer stream, get an error always

  13 décembre 2023, par hhk

  


  Code to reproduce

  


  I attached the test.gif file on https://github.com/fluent-ffmpeg/node-fluent-ffmpeg/assets/122068264/e1f3aa31-5386-4dab-a409-9a224e0610fe

  


  
const ffprobeInstaller = require('@ffprobe-installer/ffprobe');
const ffmpeg = require('fluent-ffmpeg');
const { Readable } = require('stream');
const fs = require('fs');


(async () => {

    const buffer = fs.readFileSync('test.gif');
    let readableStream = new Readable();
    readableStream._read = () => { };
    readableStream.push(buffer);
    readableStream.push(null);

    // console.log(ffprobe.path, ffprobe.version);
    ffmpeg.setFfprobePath(ffprobeInstaller.path);
    let metadata = await get_video_meta_data(readableStream);

    async function get_video_meta_data(stream) {
        return new Promise((resolve, reject) => {
            new ffmpeg()
                .input(stream)
                .ffprobe((err, data) => {
                    // console.log(err);
                });
            resolve();
        });
    }
})();





  


  (note : if the problem only happens with some inputs, include a link to such an input file)

  


  Expected results

  


  data should include duration but empty.

  


  Observed results

  


  data is empty and err happens.
Here is error data :

  


  
  libavutil      58.  1.100 / 58.  1.100
  libavcodec     60.  2.100 / 60.  2.100
  libavformat    60.  2.100 / 60.  2.100
  libavdevice    60.  0.100 / 60.  0.100
  libavfilter     9.  1.100 /  9.  1.100
  libswscale      7.  0.100 /  7.  0.100
  libswresample   4.  9.100 /  4.  9.100
  libpostproc    57.  0.100 / 57.  0.100
pipe:0: Input/output error


  


  I only need the metadta for the input gif file. specifically, duration field.