Recherche avancée

Sur d’autres sites (10077)

• Loading and unloading ffmpeg jni library based on when it's needed

  30 septembre 2014, par Alin

  I finally managed to compile ffmpeg for android and I’ve been able to use it in my app.

  Here is the scenario of my app :

  • I show the user a gridview with thumbnails of images and videos
  • the user can click on a cell and it is taken to image/video details where he can see the full image or play the video
  • the user can apply an image over an video and this is when ffmpeg is used

  So basically, the user might never actually use the watermarking option or he can do it very rare because the amount of available videos is way smaller than images.

  I am loading the ffmpeg library, first time it is needed by running :

  static {
  
       System.loadLibrary("ffmpeglib");
  
  }

  Now here are my questions :

  1. loading the library like this, uses app’s memory and resources ?
  2. can I unload the library, or better said, is it needed to unload it ? I have not found any java code like System.unloadLibrary to take care of unloading
  3. Since the library might be used rarely, wouldn’t a load => do encoding => unload be a better approach ? Or maybe having it loaded would allow easy reuse since no loading is necessary.
  4. If I use an IntentService to load the library and make the encoding, when the service completes the job, does the library gets unloaded ?

• ffmpeg burned-in subtitles keep rendering in the wrong font

  15 août 2020, par dv151

  Trying to burn in subtitles to a video in FFMPEG in GothamProBold font. No matter what I do it keeps reverting to Helvetica. From the console, I see that FFMPEG seems to load the font without error. Then switches over to font provider "coretext"

  


  [Parsed_subtitles_0 @ 0x7fed054048c0] Loading font file '/Projects/Fonts/GothaProBol.otf'
[Parsed_subtitles_0 @ 0x7fed054048c0] Using font provider coretext
[Parsed_subtitles_0 @ 0x7fed054048c0] fontselect: (GothaProBol.otf, 400, 0) -> /System/Library/Fonts/Helvetica.ttc, -1, Helvetica


  


  It seems like it has my font loaded, then loads what is likely a system default of Helvetica instead. My guess is that my chosen font isn't actually loading after all.

  


  FFMPEG command (called from python) is as follows :

  


  ffmpeg_cmd = ["ffmpeg", 
              "-i", self.source_video_uri, 
              "-y",
              "-c:v", "prores", "-profile:v", "1", 
              "-c:a", "pcm_s16be", 
              "-vf", f"subtitles={srt_uri}:fontsdir=/Projects/Fonts:force_style='Fontname=GothaProBol.otf'",
              f"{self.source_video_uri}_render.mov"]

subprocess.call(ffmpeg_cmd)


  


  Any ideas ?

  


• Saving an audio blob into the backend or Azure as an mp3 file using ffmpeg

  2 juin 2021, par Anne

  I have an asp.net webforms, and I am using javascript and navigator.mediaDevices.getUserMedia to record an audio message.
This message has to be loaded into Azure once recorded.

  


  So far, I have :
2 buttons, start and stop to record the audio blob

  


  At the end of the process, I am trying to use ffmpeg to record the blob into a folder in my application, I can then load the file into Azure (I have the code ready for this one).
Or ideally, save directly to Azure.

  


  I have installed ffmpeg in my application using nuget packages (I tried Xabe ffmpeg downloader and Accord video ffmpeg), however ffmpeg is not recognised when I run the function SendData() and I get this error :
Uncaught Error : Module name "ffmpeg" has not been loaded yet for context : _. Use require([])

  


  My questions are :

  


  

  • How can I install ffmpeg in an asp.net wbeform and register it on the page ?

  


  • Is there another way to save an audio blob to Azure ?

  


  • Is it possible to save the audio chunks into a memory stream that I can later upload into Azure ?

  


  


  Thank you for your help

  


  


  


      <code class="echappe-js">&lt;script&gt;&amp;#xA;        navigator.mediaDevices.getUserMedia({ audio: true }).then(stream =&gt; { handlerFunction(stream) })&amp;#xA;&amp;#xA;        record.onclick = e =&gt; {&amp;#xA;            record.disabled = true;&amp;#xA;            stopRecord.disabled = false;&amp;#xA;            audioChunks = [];&amp;#xA;            rec.start();&amp;#xA;        }&amp;#xA;&amp;#xA;        stopRecord.onclick = e =&gt; {&amp;#xA;            record.disabled = false;&amp;#xA;            stop.disabled = true;&amp;#xA;            rec.stop();&amp;#xA;        }&amp;#xA;&amp;#xA;&amp;#xA;        function handlerFunction(stream) {&amp;#xA;            rec = new MediaRecorder(stream);&amp;#xA;            rec.ondataavailable = e =&gt; {audioChunks.push(e.data);&amp;#xA;                if (rec.state == &quot;inactive&quot;) {&amp;#xA;                    let blob = new Blob(audioChunks, { type: &amp;#x27;audio/mpeg-3&amp;#x27; });&amp;#xA;                    recordedAudio.src = URL.createObjectURL(blob);&amp;#xA;                    recordedAudio.controls = true;&amp;#xA;                    sendData(blob)&amp;#xA;                }&amp;#xA;            }&amp;#xA;        }&amp;#xA;&amp;#xA;        function sendData(data) {&amp;#xA;            var ffmepg = require(&quot;ffmpeg&quot;);&amp;#xA;            try {&amp;#xA;                var Path = data;&amp;#xA;                var process = new ffmepg(&quot;Path&quot;);&amp;#xA;                process.then(function (audio) {audio.fnExtractSoundToMP3(&quot;~//AppData//Audio//test.mp3&quot;, function (error, file) {&amp;#xA;                        if (!error)&amp;#xA;                            console.log(&quot;Audio file: &quot; &amp;#x2B; file);&amp;#xA;                    });&amp;#xA;                }, function (err) {&amp;#xA;                    console.log(&quot;Error: &quot; &amp;#x2B; err);&amp;#xA;                });&amp;#xA;            }&amp;#xA;            catch (e) {&amp;#xA;                console.log(&quot;Catch e.code&quot; &amp;#x2B; e.code);&amp;#xA;                console.log(&quot;Catch e.msg&quot; &amp;#x2B; e.msg);&amp;#xA;            }&amp;#xA;        }&amp;#xA;    &lt;/script&gt;&#xA;&#xA;    &lt;script src=&quot;https://code.jquery.com/jquery-2.2.0.min.js&quot;&gt;&lt;/script&gt;&#xA;    &lt;script src=&quot;https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js&quot;&gt;&lt;/script&gt;

  


  &#xA;&#xA;&#xA;    &#xA;    &#xA;    &#xA;    &#xA;    <code class="echappe-js">&lt;script src='http://stackoverflow.com/Scripts/require.js'&gt;&lt;/script&gt;&#xA;&#xA;&#xA;&#xA;    
  Record
  &#xA;
  &#xA;
  Start
  &#xA;
  Stop
  &#xA;
  &#xA;
  &#xA;        &#xA;
  &#xA;&#xA;