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• How to embed cover art into MP4 without errors ?

  7 mai 2020, par symonxd

  I want to add artwork to my MP4 file. How do I do this successfully / without errors ?
I've tried these methods with numerous MP4 files, none worked.
If you would like to replicate the errors / bugs, here are the sample files I've used for this question.

  



  I've tried the following :

  



  ---

  



  

  1. ffmpeg -i sample.mp4 -i sample.png -map 0 -map 1 -c copy -disposition:v:0 attached_pic sample_w_artwork.mp4
as stated by Lukas

  


  



  with this error :

  



  [mp4 @ 0000019ee4852280] Could not find tag for codec h264 in stream #0, codec not currently supported in container
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument


  



  ffmpeg 4.2.2 (Windows build by Zeranoe)

  



  

  2. atomicparsley sample.mp4 --artwork sample.png --overWrite

  


  



  with no success ; AtomicParsley

  



  I get this message when executing the first time :

  



  Started writing to temp file.
 Progress: =============================================>100%|
 Finished writing to temp file.


  



  Executing the next (nth) time gives this :

  



  Updating metadata...   completed.


  



  

  3. Adding artwork through the GUI Tag Editor using both available versions : i686-w64 & x86_64-w64

  


  



  with no success ; it creates a sample.mp4.bak file, even though the software says that the operation was successful

  



  


  can't insert any more links, because I got too little rep apparently

  


  



  

  4. Mp3tag (mp3tag.de/en)

  


  



  with no success ; I can successfully add the image as a cover, but it's not visible in the File Explorer. After saving it says Saved tag in 1 of 1 files. The picture can been seen in Mp3tag though as if it's applied.

  



  

  5. Tag&Rename (softpointer.com)

  


  



  with no success ; same story as with Mp3tag, I can apply and it's visible in the app, but not in File Explorer.

  



  

  6. mp4v2 (https:// code.google.com/archive/p/mp4v2/downloads)

  


  



  mp4tags.exe -picture sample.png sample.mp4

  



  with no success ; it executes with no (error)message

  



  I found it on this thread

  



  (https:// forum.videohelp.com/threads/388025-How-to-set-the-thumbnail-of-a-video-clip).

  



  Have used the updated version which is the Windows build

  



  (https:// forum.doom9.org/attachment.php ?attachmentid=14314&d=1407985798).

  



  

  7. iTunes

  


  



  iTunes 12.10.6.2 (Microsoft Store version)

  



  iTunes doesn't load the file into the library. I can run it fine though in QuickTime Player.

  



  I didn't notice the 'Home Videos' tab. Now I can see it in there. I tried to apply the image, and it applied it only inside iTunes... So it's still not working for me.

  



  I tried to convert the MP4 to M4A and then adding it to iTunes. I was finally successfully able to change the cover and it was visible in File Explorer. But that's not what I want.

  



  I know for a fact that it's possible, because I've seen pictures on the Internet and YT and different threads where an answer is upvoted.

  



  

  8. tag

  


  



  https:// github.com/b4winckler/tag

  



  The description is : Simple command line audio tag editor... After having to install millions of libraries and a package manager I was stuck with the compilation of the software, followed all the steps, didn't work.

  



  I've also tried using MP4art as suggested by a comment on another issue about this. He didn't include a link to it so I went looking and found another issue about this. One comment recommended MP4art as well, with a link that's dead.

  



  ---

  



  I believe I've used some other methods as well but can't think of them right now. Will update if I recall.

  



  Any help is greatly appreciated.

  


• Record live stream using ffmpeg as Process in Java

  26 décembre 2020, par Serbroda

  I can not figure out how to start a Process in Java for recording a live stream with ffmpeg.

  



  I've tried several solutions, but my current code looks like this (simplified) :

  



  public void startDownload() {
    String[] processArgs = new String[] {
            "ffmpeg", 
            "-i", 
            "https://bitdash-a.akamaihd.net/content/sintel/hls/playlist.m3u8", 
            "-c", 
            "copy", 
            "-bsf:a", 
            "aac_adtstoasc", 
            "C:\\temp\\test.mp4"
    };
    ProcessBuilder processBuilder = new ProcessBuilder(processArgs);
    try {
        process = processBuilder.start();
        process.wairFor(); // Do I need this? Actually the stream is running forever until I stop it manually.
        BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream()));
        String line = null;
        while ((line = br.readLine()) != null) { // this blocks forever
            System.out.println(line);
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}


  



  The problem is, that something blocks the process from starting. In this example the br.readLine() blocks it forever and I can not get any output from the process.

  



  But after killing the jar / stopping launch config in Intellij, the process begins to work and I have to kill it via task manager.

  



  Running a process that is not recording a live stream like just executing ffmpeg works by the way.

  



  I'm using Windows, JDK 14, IntelliJ.

  


• ffmpeg : memory not freed on multi-threaded decoding

  31 mai 2020, par toby_e

  I am developing a video player based on the ffmpeg libraries and have run into a rather strange memory increase or failure to decrease memory when unloading a video file. My code is based on various examples of demuxing, decoding and scaling video and audio frames - but with the excecption that i have put each of these steps into seperate threads to avoid waiting for time-consuming calls. Everything works perfectly, but Visual Studio shows that Process Memory does not decrease when i call the various avclose and avfree calls. My Windows task manager confirms these memory increases that continue into the gigabyes !

  



  My player is roughly made up by two clases with the following calls to the ffmpeg libraries :

  



  —

  



  READER :

  



  Open (on main thread) : avformat_open_input(), avformat_find_stream_info()

  



  Read (on seperate thread) : av_read_frame()

  



  Close (on main thrad) : avformat_close_input()

  



  DECODER :

  



  Open (on main thread) : avcodec_find_decoder(), avcodec_alloc_context3(), avcodec_parameters_to_context(), avcodec_open2()

  



  Decode (on seperate thread) : avcodec_send_packet(), avcodec_receive_frame()

  



  Close (on main thread) : avcodec_free_context()

  



  —

  



  Is threre any issues with opening/closing on the main thread and reading/deconding on other threads ?