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• problem in making HLS using ffmpeg problem

  24 juin 2023, par AMZ

  I have a function do run in background and create m3u8 for some videos : (I is running in background and updating some fields in django).

  


  def convert_to_hls(episode):
    # Set the output directory for HLS files
output_dir = os.path.join(settings.MEDIA_ROOT, 'hls')
os.makedirs(output_dir, exist_ok=True)

# Set the input video file path
input_file_path = episode.videoFile.path

# Set the output filename and path for the HLS playlist
# filename = os.path.splitext(os.path.basename(input_file_path))[0]
characters = string.ascii_letters + string.digits
filename = ''.join(random.choice(characters) for _ in range(45))
playlist_path = os.path.join(output_dir, f'{filename}.m3u8')

# Set the output path for the HLS segments
segments_path = os.path.join(output_dir, f'{filename}_%05d.ts')

# Construct the ffmpeg command for HLS conversion
command = [
    'ffmpeg',
    '-i', input_file_path,
    '-c:v', 'libx264',
    '-crf', '23',
    '-preset', 'medium',
    '-c:a', 'aac',
    '-b:a', '128k',
    '-f', 'hls',
    '-hls_time', '10',
    '-hls_list_size', '0',
    '-hls_segment_filename', segments_path,
    playlist_path
]
# Execute the ffmpeg command
subprocess.run(command, check=True)

episode.hls_created = True
episode.hls_url = playlist_path.replace("/home/debian/project","")
episode.save()

return True


  


  this code works well for most of my videos but for some .mp4 files gets :

  


  [Fri Jun 23 17:05:47.511095 2023] [wsgi:error] [pid 19975:tid 140289048565504] Exception in thread Thread-1:
[Fri Jun 23 17:05:47.511198 2023] [wsgi:error] [pid 19975:tid 140289048565504] Traceback (most recent call last):
[Fri Jun 23 17:05:47.511244 2023] [wsgi:error] [pid 19975:tid 140289048565504]   File "/opt/bitnami/python/lib/python3.8/threading.py", line 932, in _bootstrap_inner
[Fri Jun 23 17:05:47.512078 2023] [wsgi:error] [pid 19975:tid 140289048565504]     self.run()
[Fri Jun 23 17:05:47.512124 2023] [wsgi:error] [pid 19975:tid 140289048565504]   File "/opt/bitnami/python/lib/python3.8/threading.py", line 870, in run
[Fri Jun 23 17:05:47.512707 2023] [wsgi:error] [pid 19975:tid 140289048565504]     self._target(*self._args, **self._kwargs)
[Fri Jun 23 17:05:47.512748 2023] [wsgi:error] [pid 19975:tid 140289048565504]   File "/home/debian/project/twapp/views/episode_backgrounds.py", line 41, in convert_to_hls
[Fri Jun 23 17:05:47.512950 2023] [wsgi:error] [pid 19975:tid 140289048565504]     subprocess.run(command, check=True)
[Fri Jun 23 17:05:47.512989 2023] [wsgi:error] [pid 19975:tid 140289048565504]   File "/opt/bitnami/python/lib/python3.8/subprocess.py", line 516, in run
[Fri Jun 23 17:05:47.513500 2023] [wsgi:error] [pid 19975:tid 140289048565504]     raise CalledProcessError(retcode, process.args,
[Fri Jun 23 17:05:47.513657 2023] [wsgi:error] [pid 19975:tid 140289048565504] subprocess.CalledProcessError: Command '['ffmpeg', '-i', '/home/debian/project/media/videos/introduction_to_raster_qBhrnAx.mp4', '-c:v', 'libx264', '-crf', '23', '-preset', 'medium', '-c:a', 'aac', '-b:a', '128k', '-f', 'hls', '-hls_time', '10', '-hls_list_size', '0', '-hls_segment_filename', '/home/debian/project/media/hls/ZN3fsJVEfTDEc8MFb5DrP7Y34JFNLj0hfWnGRZAwFdjuG_%05d.ts', '/home/debian/project/media/hls/ZN3fsJVEfTDEc8MFb5DrP7Y34JFNLj0hfWnGRZAwFdjuG.m3u8']' returned non-zero exit status 1.


  


  Also it does not work for .MOV files.

  


• Frames from Video Using OpenCV in Ubuntu with Java 17

  2 août 2023, par bstrdn

  I've been trying to extract frames from a video using OpenCV in an Ubuntu environment with Java 17, but all my attempts have been unsuccessful so far. The main issue is that ffmpeg is not detected by the OpenCV library on ubuntu.

  


  Here's my test code :

  


  Main class

  


  import org.opencv.core.Core;
import org.opencv.videoio.VideoCapture;

public class Main {
  public static String videoPath = "";
  static {
    String osName = System.getProperty("os.name").toLowerCase();
    if (osName.contains("win")) {
      System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
      videoPath = ClassLoader.getSystemResource("video.mp4").getPath();
    } else {
      videoPath = "/video.mp4";
//      System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
      System.load("/usr/lib/opencv_java470.so");
    }
  }

  public static void main(String[] args) throws InterruptedException {
    VideoCapture videoCapture = new VideoCapture(videoPath);
    if (!videoCapture.isOpened()) {
      System.out.println("Error opening video file.");
    } else {
      System.out.println("Everything is fine.");
    }
    System.out.println(Core.getBuildInformation());
    Thread.sleep(1000000000000000000L);
  }
}


  


  Maven :

  


  &lt;?xml version="1.0" encoding="UTF-8"?>&#xA;<project xmlns="http://maven.apache.org/POM/4.0.0">&#xA;  <modelversion>4.0.0</modelversion>&#xA;  <parent>&#xA;    <groupid>org.springframework.boot</groupid>&#xA;    <artifactid>spring-boot-starter-parent</artifactid>&#xA;    <version>3.0.2</version>&#xA;    <relativepath></relativepath> &#xA;  </parent>&#xA;  <groupid>org.example</groupid>&#xA;  <artifactid>untitled</artifactid>&#xA;  <version>1.0-SNAPSHOT</version>&#xA;  <properties>&#xA;    17&#xA;    17&#xA;    UTF-8&#xA;  </properties>&#xA;&#xA;<dependencies>&#xA;<dependency>&#xA;  <groupid>org.bytedeco</groupid>&#xA;  <artifactid>opencv-platform</artifactid>&#xA;  <version>4.7.0-1.5.9</version>&#xA;</dependency>&#xA;&#xA;<dependency>&#xA;  <groupid>org.springframework.boot</groupid>&#xA;  <artifactid>spring-boot-starter-web</artifactid>&#xA;</dependency>&#xA;</dependencies>&#xA;<build>&#xA;<plugins>&#xA;  <plugin>&#xA;    <groupid>org.springframework.boot</groupid>&#xA;    <artifactid>spring-boot-maven-plugin</artifactid>&#xA;  </plugin>&#xA;</plugins>&#xA;</build>&#xA;</project>&#xA;

  


  Dockerfile :

  


  FROM ubuntu:20.04
RUN apt-get update && apt-get install -y openjdk-17-jdk
RUN apt-get update && apt-get install -y pkg-config
RUN apt-get update && apt-get install -y ffmpeg libavformat-dev libavcodec-dev libswscale-dev libavresample-dev
ENV JAVA_HOME /usr/lib/jvm/java-17-openjdk-amd64
COPY target/*.jar /app.jar
COPY src/main/resources/video.mp4 /
COPY opencv_java470.so /usr/lib
ENV JAVA_TOOL_OPTIONS="-Djava.library.path=/usr/lib:/lib:/usr/local/lib:/usr/local:/usr/lib/x86_64-linux-gnu"
ENV LD_LIBRARY_PATH=/usr/lib:/lib:/usr/local/lib:/usr/local:/usr/lib/x86_64-linux-gnu
ENTRYPOINT [ "sh", "-c", "java $JAVA_TOOL_OPTIONS -jar /app.jar" ]


  


  The application displays the following text (video is not opened) :

  


  Error opening video file.

2023-08-02T13:30:58.448538297Z 
2023-08-02T13:30:58.448572597Z General configuration for OpenCV 4.7.0 =====================================
2023-08-02T13:30:58.448587327Z   Version control:               v4.7.0
2023-08-02T13:30:58.448590607Z 
2023-08-02T13:30:58.448593217Z   Platform:
2023-08-02T13:30:58.448596057Z     Timestamp:                   2023-03-27T23:13:34Z
2023-08-02T13:30:58.448598747Z     Host:                        Linux 5.4.0-1103-azure x86_64
2023-08-02T13:30:58.448601377Z     CMake:                       3.25.2
2023-08-02T13:30:58.448604277Z     CMake generator:             Unix Makefiles
2023-08-02T13:30:58.448606837Z     CMake build tool:            /usr/bin/make
2023-08-02T13:30:58.448609327Z     Configuration:               RELEASE
2023-08-02T13:30:58.448611867Z 
.......there is a lot of text......
2023-08-02T13:30:58.448772865Z 
2023-08-02T13:30:58.448775355Z   Video I/O:
2023-08-02T13:30:58.448777845Z     DC1394:                      NO
2023-08-02T13:30:58.448780535Z     FFMPEG:                      NO
2023-08-02T13:30:58.448783105Z       avcodec:                   NO
2023-08-02T13:30:58.448785725Z       avformat:                  NO
2023-08-02T13:30:58.448788295Z       avutil:                    NO
2023-08-02T13:30:58.448790755Z       swscale:                   NO
2023-08-02T13:30:58.448793295Z       avresample:                NO
2023-08-02T13:30:58.448795845Z     GStreamer:                   NO
2023-08-02T13:30:58.448798255Z     v4l/v4l2:                    YES (linux/videodev2.h)
2023-08-02T13:30:58.448800885Z 
2023-08-02T13:30:58.448803525Z   Parallel framework:            pthreads
2023-08-02T13:30:58.448806345Z 
............
2023-08-02T13:30:58.448859654Z   Java:                          export all functions
2023-08-02T13:30:58.448862024Z     ant:                         /usr/bin/ant (ver 1.10.5)
2023-08-02T13:30:58.448864504Z     JNI:                         /opt/hostedtoolcache/jdk/8.0.362/x64/include /opt/hostedtoolcache/jdk/8.0.362/x64/include/linux /opt/hostedtoolcache/jdk/8.0.362/x64/include
2023-08-02T13:30:58.448867224Z     Java wrappers:               YES
2023-08-02T13:30:58.448869804Z     Java tests:                  NO
2023-08-02T13:30:58.448872314Z 
2023-08-02T13:30:58.448874734Z   Install to:                    /usr/local


  


  Moreover, ffmpeg is installed on Ubuntu.

  


  How can i fix this ? I'm deathly tired(

  


  Thank you in advance for your assistance !

  


  First I tried installation following the official instructions.https://github.com/bytedeco/javacv#required-software

  


  Then the solution provided in https://stackoverflow.com/a/76750478/8087508,

  


  but the result is the same.

  


• Failed setup for format dxva2_vld : hwaccel initialisation returned error

  13 juin 2023, par james

  My program is a video player based on ffmpeg implementation, enabling d3d11va and dxva2 hardware acceleration to decode video frames, play most of the video is normal, only a small part of the video will report this error, ffmpeg printed log as follows :
I:2023-06-13 15:34:53 ms:887:No decoder device for codec found
I:2023-06-13 15:34:53 ms:887:Failed setup for format dxva2_vld : hwaccel initialisation returned error.
I:2023-06-13 15:34:53 ms:888:Format dxva2_vld not usable, retrying get_format() without it.
I:2023-06-13 15:34:53 ms:888:decode_slice_header error
I:2023-06-13 15:34:53 ms:888:no frame !

  


  If ffplay is used and d3d11va and dxva2 hardware acceleration is not enabled, the video can be played normally, and the printed video information is as follows :
PS D :\msys64\home\wangj\ffmpeg-4.4.1\buildout\bin> .\ffplay.exe -i D :\Desktop\13132023061300012_1_C1_34.mp4
ffplay version 4.4.1 Copyright (c) 2003-2021 the FFmpeg developers
configuration : —prefix=./buildout —arch=x86 —toolchain=msvc —enable-shared —disable-debug —enable-sdl2 —enable-dxva2 —enable-d3d11va
libavutil 56. 70.100 / 56. 70.100
libavcodec 58.134.100 / 58.134.100
libavformat 58. 76.100 / 58. 76.100
libavdevice 58. 13.100 / 58. 13.100
libavfilter 7.110.100 / 7.110.100
libswscale 5. 9.100 / 5. 9.100
libswresample 3. 9.100 / 3. 9.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D :\Desktop\13132023061300012_1_C1_34.mp4' :
Metadata :
major_brand : isom
minor_version : 512
compatible_brands : isomiso2avc1mp41
encoder : Lavf56.38.102
Duration : 00:00:44.00, start : 0.000000, bitrate : 1706 kb/s
Stream #0:0(und) : Video : h264 (Baseline) (avc1 / 0x31637661), yuv420p, 1920x1080, 1705 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
Metadata :
handler_name : VideoHandler
vendor_id : [0][0][0][0]

  


  Is this pixel format not supported by d3d11va and dxva2 ? What can I do to get ffplay to play this video file with hardware acceleration ?

  


  When d3d11va and dxva2 hardware acceleration is enabled, most of the videos that can be played also have yuv420p pixel format, why can't this video be played？