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How to run Bitcoin's autogen.sh file?


How to run Bitcoin's autogen.sh file?

By : Teodor Krastev
Date : November 17 2020, 01:00 AM
This might help you I'm following along in Andreas Antonopoulos Bitcoin book Mastering Bitcoin Chapter 3 (The Bitcoin client) , Installing autoconf and automake would solve the issue
code :


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Your imagination required: How to encrypt a file so that spending an amount of bitcoins is required for the decryption

Your imagination required: How to encrypt a file so that spending an amount of bitcoins is required for the decryption


By : DaJoNel
Date : March 29 2020, 07:55 AM
To fix the issue you can do I do not think this is possible. The nature of the bitcoin network is such that the transactions are public but the parties involved are pseudonymous. This means that by the time the payee learns about the transaction, all other generating nodes know about it as well. The only non-public element in a transaction is the payer's private key, and if you were to use that for the encryption the payee would have to know that key, thus compromising the security of the payer's wallet.
How to collect PKs used in bitcoins

How to collect PKs used in bitcoins


By : Anwar
Date : March 29 2020, 07:55 AM
Any of those help The entire set of Bitcoin transactions ever performed is actually available online. Any Bitcoin client will, when it first starts up, download the entire transaction log. So that's one way to do it. Just use either a client library, or run a client and parse what it downloads.
If you're happy to collect it manually, just go to Blockchain.info, and you can browse all transactions there.
How to get bitcoins for testing?

How to get bitcoins for testing?


By : lilix
Date : March 29 2020, 07:55 AM
wish help you to fix your issue If you just want to see how Bitcoin works use the TestNet,
here you got explanations and some real faucets links.
FFmpeg.AutoGen example of how to split audio file

FFmpeg.AutoGen example of how to split audio file


By : Samual Walter
Date : March 29 2020, 07:55 AM
will be helpful for those in need I want to use the FFmpeg.AutoGen project from here: https://github.com/Ruslan-B/FFmpeg.AutoGen , FFmpeg.AutoGen
What I think you need to do:
code :
using NAudio.Wave;
using System;

namespace NAudioSegments
{
    class SegmentProvider : IWaveProvider
    {
        private readonly WaveStream sourceStream;
        private int segmentStart, segmentDuration;

        public SegmentProvider(WaveStream sourceStream)
        {
            this.sourceStream = sourceStream;
        }

        public WaveFormat WaveFormat => sourceStream.WaveFormat;

        public void DefineSegment(TimeSpan start, TimeSpan duration)
        {
            if (start + duration > sourceStream.TotalTime)
                throw new ArgumentOutOfRangeException("Segment goes beyond end of input");
            segmentStart = TimeSpanToOffset(start);
            segmentDuration = TimeSpanToOffset(duration);
            sourceStream.Position = segmentStart;
        }

        public int TimeSpanToOffset(TimeSpan ts)
        {
            var bytes = (int)(WaveFormat.AverageBytesPerSecond * ts.TotalSeconds);
            bytes -= (bytes % WaveFormat.BlockAlign);
            return bytes;
        }

        public int Read(byte[] buffer, int offset, int count)
        {
            int totalBytesRead = 0;
            int bytesRead = 0;
            do
            {
                bytesRead = ReadFromSegment(buffer, offset + totalBytesRead, count - totalBytesRead);
                totalBytesRead += bytesRead;
            } while (totalBytesRead < count && bytesRead != 0);
            return totalBytesRead;
        }

        private int ReadFromSegment(byte[] buffer, int offset, int count)
        {
            var bytesAvailable = (int)(segmentStart + segmentDuration - sourceStream.Position);
            var bytesRequired = Math.Min(bytesAvailable, count);
            return sourceStream.Read(buffer, offset, bytesRequired);
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            using (var source = new Mp3FileReader(@"<input-path>"))
            {
                var segmentProvider = new SegmentProvider(source);
                // Add desired splitting e.g. start at 2 seconds, duration 1 second
                segmentProvider.DefineSegment(TimeSpan.FromSeconds(2), TimeSpan.FromSeconds(1));
                WaveFileWriter.CreateWaveFile(@"<output-path>", segmentProvider);
            }
        }
    }
}
ffmpeg -i in.m4a -f segment -segment_time 300 -c copy out%03d.m4a
ffmpeg -ss <start-time> -i in.m4a -c copy -t 300 out.m4a
How to decode MP4 file use GPU use ffmpeg.autogen?

How to decode MP4 file use GPU use ffmpeg.autogen?


By : shinsenai
Date : October 03 2020, 06:00 PM
I wish this helpful for you You need change VideoStreamDecoder class:
First you need to configurate your AVCodecContext with using HWDevice of your machine. Something like this:
code :
  AVCodecHWConfig* config = ffmpeg.avcodec_get_hw_config(codec, 0);
  ffmpeg.av_hwdevice_ctx_create(&pCodecContext->hw_device_ctx, HWType, null, null, 0);
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