Recherche avancée

Sur d’autres sites (7148)

• Convert HEVC/H.265 video to a more widely supported format using fluent-ffmpeg in Node.js

  21 juin 2021, par Daniel Loiterton

  My app allows users to upload videos from their phones. However, the latest iPhone default format (HEVC / H.265) does not seem to be supported by Chrome and other browsers, so some users cannot stream the videos.

  


  I'm already using fluent-ffmpeg on my Node.js backend to read metadata and extract thumbnails from the uploaded videos. How would I go about converting HEVC videos to something else ? What format/options would be appropriate for streaming to browsers ? Ideally I'd like to keep files fairly small, and I'm willing to sacrifice some quality to that end.

  


• ffmpeg load error in android error opening trace file : No such file or directory

  14 août 2014, par conquer_whh

  08-14 14:31:58.240 : E/Trace(7284) : error opening trace file : No such file or directory (2)
  08-14 14:31:58.265 : D/dalvikvm(7284) : Trying to load lib /data/data/com.whh.libffmpegtest/lib/libffmpeg.so 0x418d0d48
  08-14 14:31:58.265 : A/libc(7284) : Fatal signal 11 (SIGSEGV) at 0xdeadbaad (code=1), thread 7284 (h.libffmpegtest)

  this is the log, but i can run on emulator and other phones, Only in my phone occur this question.

• FFmpeg producing a flickering video from images

  21 juin 2018, par jjohnn91

  So I’m trying to make a video of a fractal rotating through some values, much like seen here.

  I generate the frames (1000 of them) using a different program written in Java that works just fine, so for the purposes of this scenario assume that all the images are in the target folder and also in numerical order as they need to appear in the video.

  I found the following code on the web to stitch images into a video, and I haven’t the faintest idea how it works, and when I run it, all of the images are indeed stitched into a video and placed on the desktop, but the video appears to have one specific frame just jump in at random positions. I’m not totally sure which one, but its one of the earlier frames, somewhere between 1 and 200 of the 1000.

  I’ve also tested making two half videos, one using the first 500 frames, and the other using the second 500 frames. The first video (1 -> 500) has flickering, and the second video (501 -> 1000) appears not to have flickering to my observations.

  I am seeking help in fixing the flickering behavior, and I will upload the video file to google drive later if asked. The Images are all 1920x1080, and in proper numerical order.

  Thanks in advance !

  import static org.bytedeco.javacpp.opencv_imgcodecs.*;
  
  import java.io.File; 
  
  import org.bytedeco.javacpp.avcodec;
  
  import org.bytedeco.javacv.FFmpegFrameRecorder;
  
  import org.bytedeco.javacv.OpenCVFrameConverter;
  
  public class ImageToMovie{
  
      public static void main(String []args){
  
          String imgPath="C:\\Users\\John\\Images";
  
          String vidPath="C:\\Users\\John\\Desktop\\video.mp4";
  
          String[] links=new String[new File(imgPath).listFiles().length];
  
          File f=new File(imgPath);
  
          File[] f2=f.listFiles();
  
          for(int i=0;icode>