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Sur d’autres sites (5540)
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Error initializing FFmpegKit : "TypeError : Cannot read property 'getLogLevel' of null" in React Native
9 janvier, par Md Monirozzaman khanI'm developing a React Native application where I need to process videos using the ffmpeg-kit-react-native library. However, I'm encountering an issue during the initialization of FFmpegKitConfig. The error message is :


ERROR Error initializing FFmpegKit: [TypeError: Cannot read property 'getLogLevel' of null]


Here is my App.js code




import React, { useState, useEffect } from 'react';
import { StyleSheet, Text, View, TouchableOpacity, Alert, Dimensions, ScrollView, LayoutAnimation, UIManager, Platform } from 'react-native';
import * as ImagePicker from 'expo-image-picker';
import * as FileSystem from 'expo-file-system';
import { Video } from 'expo-av';
import { MaterialIcons } from '@expo/vector-icons';
import { FFmpegKit, FFmpegKitConfig, ReturnCode } from 'ffmpeg-kit-react-native';

const windowWidth = Dimensions.get('window').width;

if (Platform.OS === 'android') {
 UIManager.setLayoutAnimationEnabledExperimental && UIManager.setLayoutAnimationEnabledExperimental(true);
}

export default function App() {
 const [videoFiles, setVideoFiles] = useState([]);
 const [isGridView, setIsGridView] = useState(false);
 const [isConverting, setIsConverting] = useState(false);

 useEffect(() => {
 FFmpegKitConfig.init()
 .then(() => {
 console.log('FFmpegKit initialized');
 })
 .catch((error) => {
 console.error('Error initializing FFmpegKit:', error);
 });
 }, []);

 const pickVideo = async () => {
 const { status } = await ImagePicker.requestMediaLibraryPermissionsAsync();
 if (status !== 'granted') {
 alert('Sorry, we need media library permissions to make this work!');
 return;
 }

 let result = await ImagePicker.launchImageLibraryAsync({
 mediaTypes: ImagePicker.MediaTypeOptions.Videos,
 allowsMultipleSelection: true,
 });

 if (!result.canceled && result.assets.length > 0) {
 const newFiles = result.assets.filter(
 (newFile) => !videoFiles.some((existingFile) => existingFile.uri === newFile.uri)
 );

 if (newFiles.length < result.assets.length) {
 Alert.alert('Duplicate Files', 'Some files were already added.');
 }

 LayoutAnimation.configureNext(LayoutAnimation.Presets.easeInEaseOut);
 setVideoFiles([...videoFiles, ...newFiles]);
 }
 };

 const convertVideos = async () => {
 setIsConverting(true);
 const outputDir = `${FileSystem.documentDirectory}Output`;

 const dirInfo = await FileSystem.getInfoAsync(outputDir);
 if (!dirInfo.exists) {
 await FileSystem.makeDirectoryAsync(outputDir, { intermediates: true });
 }

 for (const video of videoFiles) {
 const { uri } = video;
 const filename = uri.split('/').pop();
 const outputFilePath = `${outputDir}/${filename.split('.').slice(0, -1).join('.')}_modified.mp4`;

 const ffmpegCommand = `-y -i "${uri}" -af "atempo=1.02, bass=g=4:f=80:w=3, treble=g=4:f=3200:w=3, firequalizer=gain_entry='entry(0,0);entry(62,2);entry(125,1.5);entry(250,1);entry(500,1);entry(1000,1);entry(2000,1.5);entry(4000,2.5);entry(8000,3);entry(16000,4)', compand=attacks=0.05:decays=0.25:points=-80/-80-50/-15-30/-10-10/-2:soft-knee=4:gain=2, deesser, highpass=f=35, lowpass=f=17000, loudnorm=I=-16:LRA=11:TP=-1.5, volume=3.9dB" -c:v copy -c:a aac -b:a 224k -ar 48000 -threads 0 "${outputFilePath}"`;

 try {
 const session = await FFmpegKit.execute(ffmpegCommand);
 const returnCode = await session.getReturnCode();

 if (ReturnCode.isSuccess(returnCode)) {
 console.log(`Video converted: ${outputFilePath}`);
 } else if (ReturnCode.isCancel(returnCode)) {
 console.log('Conversion cancelled');
 } else {
 console.error(`FFmpeg process failed: ${session.getFailStackTrace()}`);
 }
 } catch (error) {
 console.error(`Error converting video: ${error.message}`);
 }
 }

 setIsConverting(false);
 Alert.alert('Conversion Complete', 'All videos have been converted.');
 };

 const deleteVideo = (uri) => {
 LayoutAnimation.configureNext(LayoutAnimation.Presets.easeInEaseOut);
 setVideoFiles(videoFiles.filter((video) => video.uri !== uri));
 };

 const clearAllVideos = () => {
 LayoutAnimation.configureNext(LayoutAnimation.Presets.easeInEaseOut);
 setVideoFiles([]);
 };

 const toggleLayout = () => {
 LayoutAnimation.configureNext(LayoutAnimation.Presets.easeInEaseOut);
 setIsGridView(!isGridView);
 };

 return (
 <view style="{styles.container}">
 <text style="{styles.header}">Video Converter App</text>
 <touchableopacity style="{styles.addButton}">
 <text style="{styles.addButtonText}">Select or Browse Videos</text>
 </touchableopacity>
 <view style="{styles.headerContainer}">
 <text style="{styles.videoCount}">Total Videos: {videoFiles.length}</text>
 {videoFiles.length > 0 && (
 <>
 <touchableopacity style="{styles.clearButtonContainer}">
 <materialicons size="{24}" color="red" style="{styles.clearIcon}"></materialicons>
 <text style="{styles.clearAllText}">Clear All</text>
 </touchableopacity>
 <touchableopacity style="{styles.toggleLayoutButton}">
 <materialicons size="{24}" color="#fff"></materialicons>
 </touchableopacity>
 >
 )}
 </view>
 {isGridView ? (
 <scrollview contentcontainerstyle="{styles.gridContainer}">
 {videoFiles.map((item, index) => (
 <view key="{index}" style="{styles.videoItemGrid}">
 
 <touchableopacity>> deleteVideo(item.uri)} style={styles.deleteButtonGrid}>
 <materialicons size="{24}" color="red"></materialicons>
 </touchableopacity>
 </view>
 ))}
 </scrollview>
 ) : (
 <view style="{styles.list}">
 {videoFiles.map((item, index) => (
 <view key="{index}" style="{styles.videoItem}">
 
 <text style="{styles.fileName}">{decodeURI(item.fileName || item.uri.split('/').pop() || 'Unknown File')}</text>
 <touchableopacity>> deleteVideo(item.uri)} style={styles.deleteButton}>
 <materialicons size="{24}" color="red"></materialicons>
 </touchableopacity>
 </view>
 ))}
 </view>
 )}
 {videoFiles.length > 0 && (
 <touchableopacity style="{styles.convertButton}" disabled="{isConverting}">
 <text style="{styles.convertButtonText}">{isConverting ? 'Converting...' : 'Convert'}</text>
 </touchableopacity>
 )}
 </view>
 );
}

const styles = StyleSheet.create({
 container: {
 flex: 1,
 backgroundColor: '#fff',
 alignItems: 'center',
 padding: 10,
 },
 header: {
 fontSize: 24,
 fontWeight: 'bold',
 marginBottom: 5,
 },
 addButton: {
 backgroundColor: '#007BFF',
 padding: 15,
 borderRadius: 10,
 alignItems: 'center',
 marginBottom: 5,
 width: '100%',
 elevation: 2,
 shadowColor: '#000',
 shadowOffset: { width: 0, height: 5 },
 shadowOpacity: 0.8,
 shadowRadius: 2,
 },
 addButtonText: {
 color: '#fff',
 fontSize: 18,
 fontWeight: 'bold',
 },
 headerContainer: {
 flexDirection: 'row',
 alignItems: 'center',
 justifyContent: 'space-between',
 width: '100%',
 marginBottom: 10,
 },
 videoCount: {
 fontSize: 18,
 },
 clearButtonContainer: {
 flexDirection: 'row',
 alignItems: 'center',
 marginRight: 10,
 },
 clearIcon: {
 marginRight: 5,
 },
 clearAllText: {
 fontSize: 16,
 color: 'red',
 textDecorationLine: 'underline',
 },
 toggleLayoutButton: {
 backgroundColor: '#007BFF',
 padding: 1,
 borderRadius: 8,
 alignItems: 'center',
 justifyContent: 'center',
 },
 list: {
 flex: 1,
 width: '100%',
 },
 videoItem: {
 padding: 5,
 borderBottomColor: '#ccc',
 borderBottomWidth: 0.7,
 flexDirection: 'row',
 alignItems: 'center',
 },
 videoItemGrid: {
 flexDirection: 'column',
 alignItems: 'center',
 margin: 4,
 borderWidth: 1,
 borderColor: '#ccc',
 borderRadius: 8,
 padding: 2,
 position: 'relative',
 },
 thumbnail: {
 width: 70,
 height: 70,
 marginRight: 10,
 },
 thumbnailGrid: {
 width: 80,
 height: 80,
 marginBottom: 0,
 },
 fileName: {
 fontSize: 16,
 marginLeft: 10,
 flex: 1,
 },
 deleteButton: {
 marginLeft: 60,
 width: 20,
 height: 20,
 },
 deleteButtonGrid: {
 position: 'absolute',
 bottom: 5,
 right: 5,
 },
 convertButton: {
 backgroundColor: '#007BFF',
 padding: 15,
 borderRadius: 10,
 alignItems: 'center',
 marginTop: 20,
 width: '100%',
 },
 convertButtonText: {
 color: '#fff',
 fontSize: 18,
 fontWeight: 'bold',
 },
 gridContainer: {
 flexDirection: 'row',
 flexWrap: 'wrap',
 justifyContent: 'flex-start',
 paddingVertical: 5,
 paddingHorizontal: 5,
 width: '100%',
 },
});






App.json




{
 "expo": {
 "name": "VidoeConvert",
 "slug": "VidoeConvert",
 "version": "1.0.0",
 "orientation": "portrait",
 "icon": "./assets/icon.png",
 "userInterfaceStyle": "light",
 "splash": {
 "image": "./assets/splash.png",
 "resizeMode": "contain",
 "backgroundColor": "#ffffff"
 },
 "ios": {
 "supportsTablet": true
 },
 "android": {
 "adaptiveIcon": {
 "foregroundImage": "./assets/adaptive-icon.png",
 "backgroundColor": "#ffffff"
 },
 "package": "com.anonymous.VidoeConvert"
 },
 "web": {
 "favicon": "./assets/favicon.png"
 },
 "plugins": [
 "@config-plugins/ffmpeg-kit-react-native",
 "expo-build-properties"
 ]
 }
}






Package.json




{
 "name": "vidoeconvert",
 "version": "1.0.0",
 "main": "expo/AppEntry.js",
 "scripts": {
 "start": "expo start",
 "android": "expo run:android",
 "ios": "expo run:ios",
 "web": "expo start --web"
 },
 "dependencies": {
 "@config-plugins/ffmpeg-kit-react-native": "^8.0.0",
 "@expo/metro-runtime": "~3.2.1",
 "expo": "~51.0.17",
 "expo-asset": "~10.0.10",
 "expo-av": "^14.0.6",
 "expo-document-picker": "~12.0.2",
 "expo-file-system": "~17.0.1",
 "expo-image-picker": "~15.0.7",
 "expo-media-library": "~16.0.4",
 "expo-status-bar": "~1.12.1",
 "ffmpeg-kit-react-native": "^6.0.2",
 "react": "18.2.0",
 "react-dom": "18.2.0",
 "react-native": "^0.74.3",
 "react-native-document-picker": "^9.3.0",
 "react-native-ffmpeg": "^0.5.2",
 "react-native-vector-icons": "^10.1.0",
 "react-native-web": "~0.19.10",
 "expo-build-properties": "~0.12.3"
 },
 "devDependencies": {
 "@babel/core": "^7.20.0"
 },
 "private": true
}






Has anyone encountered a similar issue or can point me in the right direction to resolve this error ? Any help would be greatly appreciated !


How to remove the error ?


any configruation required for this project ?


-
"FFmpeg : Error not transitioning to the next song in Discord Bot's queue."
1er avril 2024, par nooberI have 3 modules, but I'm sure the error occurs within this module, and here is the entire code within that module :


import asyncio
import discord
from discord import FFmpegOpusAudio, Embed
import os

async def handle_help(message):
 embed = discord.Embed(
 title="Danh sách lệnh cho Bé Mèo",
 description="Dưới đây là các lệnh mà chủ nhân có thể bắt Bé Mèo phục vụ:",
 color=discord.Color.blue()
 )
 embed.add_field(name="!play", value="Phát một bài hát từ YouTube.", inline=False)
 embed.add_field(name="!pause", value="Tạm dừng bài hát đang phát.", inline=False)
 embed.add_field(name="!resume", value="Tiếp tục bài hát đang bị tạm dừng.", inline=False)
 embed.add_field(name="!skip", value="Chuyển đến bài hát tiếp theo trong danh sách chờ.", inline=False)
 embed.add_field(name="!stop", value="Dừng phát nhạc và cho phép Bé Mèo đi ngủ tiếp.", inline=False)
 # Thêm các lệnh khác theo cùng mẫu trên
 await message.channel.send(embed=embed)

class Song:
 def __init__(self, title, player):
 self.title = title # Lưu trữ tiêu đề bài hát ở đây
 self.player = player

# Thêm đối tượng Song vào hàng đợi
def add_song_to_queue(guild_id, queues, song):
 queues.setdefault(guild_id, []).append(song)

async def handle_list(message, queues):
 log_file_path = "C:\\Bot Music 2\\song_log.txt"
 if os.path.exists(log_file_path):
 with open(log_file_path, "r", encoding="utf-8") as f:
 song_list = f.readlines()

 if song_list:
 embed = discord.Embed(
 title="Danh sách bài hát",
 description="Danh sách các bài hát đã phát:",
 color=discord.Color.blue()
 )

 for i, song in enumerate(song_list, start=1):
 if i == 1:
 song = "- Đang phát: " + song.strip()
 embed.add_field(name=f"Bài hát {i}", value=song, inline=False)

 await message.channel.send(embed=embed)
 else:
 await message.channel.send("Hiện không có dữ liệu trong file log.")
 else:
 await message.channel.send("File log không tồn tại.")

async def handle_commands(message, client, queues, voice_clients, yt_dl_options, ytdl, ffmpeg_options=None, guild_id=None, data=None):
 # Nếu không có ffmpeg_options, sử dụng các thiết lập mặc định
 if ffmpeg_options is None:
 ffmpeg_options = {
 'before_options': '-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5',
 'options': '-vn -filter:a "volume=0.25"'
 }
 
 # Khởi tạo voice_client
 if guild_id is None:
 guild_id = message.guild.id

 if guild_id in voice_clients:
 voice_client = voice_clients[guild_id]
 else:
 voice_client = None

 # Xử lý lệnh !play
 if message.content.startswith("!play"):
 try:
 # Kiểm tra xem người gửi tin nhắn có đang ở trong kênh voice không
 voice_channel = message.author.voice.channel
 # Kiểm tra xem bot có đang ở trong kênh voice của guild không
 if voice_client and voice_client.is_connected():
 await voice_client.move_to(voice_channel)
 else:
 voice_client = await voice_channel.connect()
 voice_clients[guild_id] = voice_client
 except Exception as e:
 print(e)

 try:
 query = ' '.join(message.content.split()[1:])
 if query.startswith('http'):
 url = query
 else:
 query = 'ytsearch:' + query
 loop = asyncio.get_event_loop()
 data = await loop.run_in_executor(None, lambda: ytdl.extract_info(query, download=False))
 if not data:
 raise ValueError("Không có dữ liệu trả về từ YouTube.")
 url = data['entries'][0]['url']

 player = FFmpegOpusAudio(url, **ffmpeg_options)
 # Lấy thông tin của bài hát mới đang được yêu cầu
 title = data['entries'][0]['title']
 duration = data['entries'][0]['duration']
 creator = data['entries'][0]['creator'] if 'creator' in data['entries'][0] else "Unknown"
 requester = message.author.nick if message.author.nick else message.author.name
 
 # Tạo embed để thông báo thông tin bài hát mới
 embed = discord.Embed(
 title="Thông tin bài hát mới",
 description=f"**Bài hát:** *{title}*\n**Thời lượng:** *{duration}*\n**Tác giả:** *{creator}*\n**Người yêu cầu:** *{requester}*",
 color=discord.Color.green()
 )
 await message.channel.send(embed=embed)
 
 # Sau khi lấy thông tin của bài hát diễn ra, gọi hàm log_song_title với title của bài hát
 # Ví dụ:
 title = data['entries'][0]['title']
 await log_song_title(title)

 # Thêm vào danh sách chờ nếu có bài hát đang phát
 if voice_client.is_playing():
 queues.setdefault(guild_id, []).append(player)
 else:
 voice_client.play(player)
 
 except Exception as e:
 print(e)
 
 if message.content.startswith("!link"):
 try:
 voice_client = await message.author.voice.channel.connect()
 voice_clients[voice_client.guild.id] = voice_client
 except Exception as e:
 print(e)

 try:
 url = message.content.split()[1]

 loop = asyncio.get_event_loop()
 data = await loop.run_in_executor(None, lambda: ytdl.extract_info(url, download=False))

 song = data['url']
 player = discord.FFmpegOpusAudio(song, **ffmpeg_options)

 voice_clients[message.guild.id].play(player)
 except Exception as e:
 print(e)

 # Xử lý lệnh !queue
 elif message.content.startswith("!queue"):
 queue = queues.get(guild_id, [])
 if queue:
 await message.channel.send("Danh sách chờ:")
 for index, item in enumerate(queue, 1):
 await message.channel.send(f"{index}. {item.title}")
 else:
 await message.channel.send("Không có bài hát nào trong danh sách chờ.")

 # Xử lý lệnh !skip
 elif message.content.startswith("!skip"):
 try:
 if voice_client and voice_client.is_playing():
 voice_client.stop()
 await play_next_song(guild_id, queues, voice_client, skip=True)
 await remove_first_line_from_log()
 except Exception as e:
 print(e)

 # Xử lý các lệnh như !pause, !resume, !stop
 elif message.content.startswith("!pause"):
 try:
 if voice_client and voice_client.is_playing():
 voice_client.pause()
 except Exception as e:
 print(e)

 elif message.content.startswith("!resume"):
 try:
 if voice_client and not voice_client.is_playing():
 voice_client.resume()
 except Exception as e:
 print(e)

 elif message.content.startswith("!stop"):
 try:
 if voice_client:
 voice_client.stop()
 await voice_client.disconnect()
 del voice_clients[guild_id] # Xóa voice_client sau khi dừng
 except Exception as e:
 print(e)

async def log_song_title(title):
 log_file_path = "C:\\Bot Music 2\\song_log.txt"
 try:
 # Kiểm tra xem tệp tin log đã tồn tại chưa
 if not os.path.exists(log_file_path):
 # Nếu chưa tồn tại, tạo tệp tin mới và ghi title vào tệp tin đó
 with open(log_file_path, 'w', encoding='utf-8') as file:
 file.write(title + '\n')
 else:
 # Nếu tệp tin log đã tồn tại, mở tệp tin và chèn title vào cuối tệp tin
 with open(log_file_path, 'a', encoding='utf-8') as file:
 file.write(title + '\n')
 except Exception as e:
 print(f"Error logging song title: {e}")

async def remove_first_line_from_log():
 log_file_path = "C:\\Bot Music 2\\song_log.txt"
 try:
 with open(log_file_path, "r", encoding="utf-8") as f:
 lines = f.readlines()
 # Xóa dòng đầu tiên trong list lines
 lines = lines[1:]
 with open(log_file_path, "w", encoding="utf-8") as f:
 for line in lines:
 f.write(line)
 except Exception as e:
 print(f"Error removing first line from log: {e}")
 
async def clear_log_file():
 log_file_path = "C:\\Bot Music 2\\song_log.txt"
 try:
 with open(log_file_path, "w", encoding="utf-8") as f:
 f.truncate(0)
 except Exception as e:
 print(f"Error clearing log file: {e}")


async def play_next_song(guild_id, queues, voice_client, skip=False):
 queue = queues.get(guild_id, [])
 if queue:
 player = queue.pop(0)
 voice_client.play(player, after=lambda e: asyncio.run_coroutine_threadsafe(play_next_song(guild_id, queues, voice_client, skip=False), voice_client.loop))
 if skip:
 return
 else:
 await remove_first_line_from_log() # Xóa dòng đầu tiên trong file log
 elif skip:
 await remove_first_line_from_log() # Xóa dòng đầu tiên trong file log
 await voice_client.disconnect()
 del voice_client[guild_id] # Xóa voice_client sau khi dừng
 else:
 await clear_log_file() # Xóa dòng đầu tiên trong file log
 await voice_client.disconnect()
 del voice_client[guild_id] # Xóa voice_client sau khi dừng


I have tried asking ChatGPT, Gemini, or Bing, and they always lead me into a loop of errors that cannot be resolved. This error only occurs when the song naturally finishes playing due to its duration. If the song is playing and I use the command !skip, the next song in the queue will play and function normally. I noticed that it seems like if a song ends naturally, the song queue is also cleared immediately. I hope someone can help me with this


-
Using Accord.Video.FFMPEG, I get "parameter is not valid exception". How can I solve it ?
31 mai 2023, par Sheron BlumentalI want to extract all the frames from an MP4 video file and display them on a PictureBox.


The original code comes from this Q&A : How can I time the presentation and extraction of frames from a video file ?


The exception happens after clicking the start button on the line :


var frame = videoReader.ReadVideoFrame();


The message


System.ArgumentException
 HResult=0x80070057
 Message=Parameter is not valid.
 Source=System.Drawing
 StackTrace:
 at System.Drawing.Bitmap..ctor(Int32 width, Int32 height, PixelFormat format)
 at Accord.Video.FFMPEG.VideoFileReader.DecodeVideoFrame(BitmapData bitmapData)
 at Accord.Video.FFMPEG.VideoFileReader.readVideoFrame(Int32 frameIndex, BitmapData output)
 at Accord.Video.FFMPEG.VideoFileReader.ReadVideoFrame()
 at Extract_Frames.Form1.<getvideoframesasync>d__15.MoveNext() in D:\Csharp Projects\Extract Frames\Form1.cs:line 114
 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
 at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
 at Extract_Frames.Form1.d__17.MoveNext() in D:\Csharp Projects\Extract Frames\Form1.cs:line 151
</getvideoframesasync>

The full code


using Accord.IO;
using Accord.Video;
using Accord.Video.FFMPEG;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Reflection.Emit;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Extract_Frames
{
 public partial class Form1 : Form
 {
 Bitmap frame = null;
 Graphics frameGraphics = null;
 bool isVideoRunning = false;
 IProgress<bitmap> videoProgress = null;
 private CancellationTokenSource cts = null;
 private readonly object syncRoot = new object();
 private static long pause = 0;
 private int frameRate = 0;
 private List<bitmap> frames = new List<bitmap>();
 string fileName;

 public Form1()
 {
 InitializeComponent();

 }

 private void Form1_Load(object sender, EventArgs e)
 {

 }

 private void StopPlayback(bool cancel)
 {
 lock (syncRoot)
 {
 if (cancel) cts?.Cancel();
 cts?.Dispose();
 cts = null;
 }
 }

 int counter =1;
 private void Updater(Bitmap videoFrame)
 {
 frames.Add(videoFrame);

 label1.Text = "Current Frame Number : " + counter;
 trackBar1.Value = counter;
 counter++;

 //Size size = new Size(videoFrame.Width, videoFrame.Height);
 //pictureBox1.ClientSize = size;
 using (videoFrame) frameGraphics.DrawImage(videoFrame, Point.Empty);

 pictureBox1.Invalidate();
 }

 private async Task GetVideoFramesAsync(IProgress<bitmap> updater, string fileName, int intervalMs, CancellationToken token = default)
 {
 using (var videoReader = new VideoFileReader())
 {
 if (token.IsCancellationRequested) return;
 videoReader.Open(fileName);

 videoReader.ReadVideoFrame(1);
 trackBar1.Value = 1;

 label1.Text = "Current Frame Number : " + counter.ToString();

 while (true)
 {
 if (Interlocked.Read(ref pause) == 0)
 {
 var frame = videoReader.ReadVideoFrame();

 if (token.IsCancellationRequested || frame is null) break;
 updater.Report(frame);
 }
 await Task.Delay(frameRate).ConfigureAwait(false);
 }
 }
 }

 private void trackBar2_Scroll(object sender, EventArgs e)
 {
 frameRate = trackBar2.Value / 25;
 }

 private async void buttonStart_Click(object sender, EventArgs e)
 {
 string fileName = textBox1.Text;

 if (isVideoRunning) return;
 isVideoRunning = true;

 using (var videoReader = new VideoFileReader())
 {
 videoReader.Open(fileName);
 frame = new Bitmap(videoReader.Width + 2, videoReader.Height + 2);
 trackBar1.Maximum = (int)videoReader.FrameCount;
 }

 videoProgress = new Progress<bitmap>((bitmap) => Updater(bitmap));
 cts = new CancellationTokenSource();
 pictureBox1.Image = frame;
 try
 {
 frameGraphics = Graphics.FromImage(frame);
 // Set the fame rate to 25 frames per second
 //int frameRate = 1000 / 25;
 await GetVideoFramesAsync(videoProgress, fileName, frameRate, cts.Token);
 }
 finally
 {
 frameGraphics?.Dispose();
 StopPlayback(false);
 isVideoRunning = false;
 }
 }

 private void buttonPause_Click(object sender, EventArgs e)
 {
 if (pause == 0)
 {
 buttonPause.Text = "Resume";
 Interlocked.Increment(ref pause);
 }
 else
 {
 Interlocked.Decrement(ref pause);
 buttonPause.Text = "Pause";
 }
 }

 private void buttonStop_Click(object sender, EventArgs e)
 {
 StopPlayback(true);
 }

 protected override void OnFormClosing(FormClosingEventArgs e)
 {
 if (isVideoRunning) StopPlayback(true);
 pictureBox1.Image?.Dispose();
 base.OnFormClosing(e);
 }

 private void pictureBox1_Paint(object sender, PaintEventArgs e)
 {
 ControlPaint.DrawBorder(e.Graphics, pictureBox1.ClientRectangle, Color.Red, ButtonBorderStyle.Solid);
 }

 private void trackBar1_Scroll(object sender, EventArgs e)
 {
 pictureBox1.Image = frames[trackBar1.Value];
 }

 private void button1_Click(object sender, EventArgs e)
 {
 using (OpenFileDialog openFileDialog = new OpenFileDialog())
 {
 openFileDialog.InitialDirectory = "c:\\";
 openFileDialog.Filter = "video files (*.mp4)|*.mp4|All files (*.*)|*.*";
 openFileDialog.FilterIndex = 2;
 openFileDialog.RestoreDirectory = true;

 if (openFileDialog.ShowDialog() == DialogResult.OK)
 {
 // Get the path of specified file
 textBox1.Text = openFileDialog.FileName;
 }
 }
 }
 }
}
</bitmap></bitmap></bitmap></bitmap></bitmap>

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