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  • How can i capture a screenshots from pictureBox1 every X milliseconds ?

    9 avril 2016, par Brubaker Haim

    The way it is now it’s capturing screenshots depending on on what screen I am in.
    For example if i’m in my desktop it will take screenshots of my desktop if I move to the form1 and see the pictureBox1 it will take screenshots of the pictureBox1.

    But how can I get directly screenshots from the pictureBox1 no matter on what screen I am ?

    Bitmap bmp1;
    
        public static int counter = 0;
    
        private void timer1_Tick(object sender, EventArgs e)
    
        {
    
            counter++;
    

    
            Rectangle rect = new Rectangle(0, 0, pictureBox1.ClientSize.Width, pictureBox1.ClientSize.Height);
    
            bmp1 = new Bitmap(rect.Width, rect.Height, PixelFormat.Format32bppArgb);
    
            Graphics g = Graphics.FromImage(bmp1);
    
            g.CopyFromScreen(rect.Left, rect.Top, 0, 0, bmp1.Size, CopyPixelOperation.SourceCopy);
    
            bmp1.Save(@"e:\screenshots\" + "screenshot" + counter.ToString("D6") + ".bmp", ImageFormat.Bmp);
    
            bmp1.Dispose();
    
            g.Dispose();
    
            if (counter == 500)//1200)
    
            {
    
                timer1.Stop();
    
                this.Close();
    
            }
    
        }

    The timer1 is set now to 100ms interval in the designer.
    But what is a reasonable speed to take screenshots from animation in the pictureBox1 ? In this case I have a game I show in the pictureBox1 and I want to take a screenshots of each frame from the pictureBox1 and in real time to create mp4 video file on the hard disk from each frame I took.

    So instead saving the bmp1 to the hard disk I need somehow to save each frame I capture in memory and build mp4 video file in real time.

    I created a ffmpeg class for that :

    using System;
    
using System.Windows.Forms;
    
using System.Collections.Generic;
    
using System.Linq;
    
using System.Text;
    
using System.Threading.Tasks;
    
using System.Drawing;
    
using System.IO.Pipes;
    
using System.Runtime.InteropServices;
    
using System.Diagnostics;
    
using System.IO;
    
using DannyGeneral;
    

    
namespace ffmpeg
    
{
    
    public class Ffmpeg
    
    {
    
        NamedPipeServerStream p;
    
        String pipename = "mytestpipe";
    
        System.Diagnostics.Process process;
    
        string ffmpegFileName = "ffmpeg.exe";
    
        string workingDirectory;
    

    
        public Ffmpeg()
    
        {
    
            workingDirectory = Path.GetDirectoryName(Application.ExecutablePath);
    
            Logger.Write("workingDirectory: " + workingDirectory);
    
            if (!Directory.Exists(workingDirectory))
    
            {
    
                Directory.CreateDirectory(workingDirectory);
    
            }
    
            ffmpegFileName = Path.Combine(workingDirectory, ffmpegFileName);
    
            Logger.Write("FfmpegFilename: " + ffmpegFileName);
    
        }
    

    
        public void Start(string pathFileName, int BitmapRate)
    
        {
    
            try
    
            {
    

    
                string outPath = pathFileName;
    
                p = new NamedPipeServerStream(pipename, PipeDirection.Out, 1, PipeTransmissionMode.Byte);
    
                ProcessStartInfo psi = new ProcessStartInfo();
    
                psi.WindowStyle = ProcessWindowStyle.Hidden;
    
                psi.UseShellExecute = false;
    
                psi.CreateNoWindow = false;
    
                psi.FileName = ffmpegFileName;
    
                psi.WorkingDirectory = workingDirectory;
    
                psi.Arguments = @"-f rawvideo -pix_fmt bgra -video_size 1920x1080 -i \\.\pipe\mytestpipe -c:v mpeg2video -crf 20 -r " + BitmapRate + " " + outPath;
    
                process = Process.Start(psi);
    
                process.EnableRaisingEvents = false;
    
                psi.RedirectStandardError = true;
    
                p.WaitForConnection();
    
            }
    
            catch (Exception err)
    
            {
    
                Logger.Write("Exception Error: " + err.ToString());
    
            }
    
        }
    

    
        public void PushFrame(Bitmap bmp)
    
        {
    
            try
    
            {
    
                int length;
    
                // Lock the bitmap's bits.
    
                //bmp = new Bitmap(1920, 1080);
    
                Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
    
                //Rectangle rect = new Rectangle(0, 0, 1280, 720);
    
                System.Drawing.Imaging.BitmapData bmpData =
    
                    bmp.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadOnly,
    
                    bmp.PixelFormat);
    

    
                int absStride = Math.Abs(bmpData.Stride);
    
                // Get the address of the first line.
    
                IntPtr ptr = bmpData.Scan0;
    

    
                // Declare an array to hold the bytes of the bitmap.
    
                //length = 3 * bmp.Width * bmp.Height;
    
                length = absStride * bmpData.Height;
    
                byte[] rgbValues = new byte[length];
    

    
                //Marshal.Copy(ptr, rgbValues, 0, length);
    
                int j = bmp.Height - 1;
    
                for (int i = 0; i < bmp.Height; i++)
    
                {
    
                    IntPtr pointer = new IntPtr(bmpData.Scan0.ToInt32() + (bmpData.Stride * j));
    
                    System.Runtime.InteropServices.Marshal.Copy(pointer, rgbValues, absStride * (bmp.Height - i - 1), absStride);
    
                    j--;
    
                }
    
                p.Write(rgbValues, 0, length);
    
                bmp.UnlockBits(bmpData);
    
            }
    
            catch(Exception err)
    
            {
    
                Logger.Write("Error: " + err.ToString());
    
            }
    

    
        }
    

    
        public void Close()
    
        {
    
            p.Close();
    
        }
    
    }
    
}

    And using the ffmpeg class like this :

    public static Ffmpeg fmpeg;

    Then

    fmpeg = new Ffmpeg();
    
fmpeg.Start(@"e:\screenshots\test.mp4", 25);

    And

    fmpeg.PushFrame(_screenShot);

    My main question is first how to get the screenshots(frames) from the pictureBox1 directly no matter what screen i’m in now ?

    And how to use on each frame with the fmpeg to get a fine mp4 speed video file I mean that I will not miss a frame to capture all frames and also that the mp4 video file will when I play it later will not display a fast video or too slow ?

  • FFMPEG to periscope or twitter

    18 mars 2021, par Jintor

    In twitter studio to stream they specify

    


    RTMP URL rtmp ://va.pscp.tv:80/x

    


    RTMPS URL rtmps ://va.pscp.tv:443/x

    


    but when I do

    


    ffmpeg -re -i file.webm -c:v libx264 -preset ultrafast -vf "scale=-2:1080" -g 60 -pix_fmt yuv420p -c:a aac -b:a 128k -ac 2 -r 30 -vb 900k -minrate 900k -maxrate 900k -bufsize 900k -ar 44100 rtmps://va.pscp.tv:443/x/


    


    I get this error

    


    Unable to find a suitable output format for rtmps://va.pscp.tv:443/x/key: Invalid argument


    


    I tried with and without the x but nothing goes, still same error

    


    how to fix this

    


  • Transcoding with the GCP Transcoder API results in a time gap

    3 mars 2021, par banyan

    I've been trying GCP's Transcoder API and having trouble with the time randomly becoming shorter than specified in certain cases.

    


    The specific cases are as follows :

    


      

    1. Specifying startTimeOffset and endTimeOffset (cut off 2 seconds before and after the video)

      2. 


    2. fMP4 is used as container

      3. 


    3. input video is mp4 with screen recording on iPad Pro

      4. 


    


    For example, if I don't specify startTimeOffset and endTimeOffset, the time will not be shortened. Also, there is no problem when MPEG2-TS is specified for container. There may be a problem with the video itself, but I haven't found a clue how to set it up.

    


    I'm not sure whether this is a problem with the Transcoder API or with me.

    


    The test input video : https://gofile.io/d/DUT9rr

    


    ❯ ffprobe input.mp4
ffprobe version 4.3.1 Copyright (c) 2007-2020 the FFmpeg developers
  built with Apple clang version 12.0.0 (clang-1200.0.32.28)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1_8 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 1
    compatible_brands: isommp41mp42
    creation_time   : 2021-02-26T15:08:58.000000Z
  Duration: 00:02:51.15, start: 0.000000, bitrate: 551 kb/s
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 246 kb/s (default)
    Metadata:
      creation_time   : 2021-02-26T15:08:58.000000Z
      handler_name    : Core Media Audio
    Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt709/bt709/iec61966-2-1), 1920x1342, 302 kb/s, 12.39 fps, 120 tbr, 600 tbn, 1200 tbc (default)
    Metadata:
      rotate          : 180
      creation_time   : 2021-02-26T15:08:58.000000Z
      handler_name    : Core Media Video
    Side data:
      displaymatrix: rotation of -180.00 degrees


    


    #!/bin/bash -eu

cat > request.json << EOF
{
  "config": {
    "inputs": [
      {
        key: "input0"
      }
    ],
    "editList": [
      {
        "key": "atom0",
        "inputs": [
          "input0"
        ],
        "startTimeOffset": "2s",
        "endTimeOffset": "169s",
      },
    ],
    "elementaryStreams": [
      {
        "videoStream": {
          "codec": "h265",
          "heightPixels": 480,
          "bitrateBps": 1200000,
          "rateControlMode": "vbr",
          "enableTwoPass": true,
          "frameRate": 30,
          "crfLevel": 31,
          "gopDuration": "3.0s",
        },
        "key": "h265-stream0"
      },
      {
        "videoStream": {
          "codec": "h265",
          "heightPixels": 720,
          "bitrateBps": 1550000,
          "rateControlMode": "vbr",
          "enableTwoPass": true,
          "frameRate": 30,
          "crfLevel": 31,
          "gopDuration": "3.0s",
        },
        "key": "h265-stream1"
      },
      {
        "videoStream": {
          "codec": "h265",
          "heightPixels": 1080,
          "bitrateBps": 2600000,
          "rateControlMode": "vbr",
          "enableTwoPass": true,
          "frameRate": 30,
          "crfLevel": 31,
          "gopDuration": "3.0s",
        },
        "key": "h265-stream2"
      },
      {
        "audioStream": {
          "codec": "aac",
          "bitrateBps": 64000,
          "channelCount": 2,
          "channelLayout": [
            "fl",
            "fr"
          ],
          "sampleRateHertz": 48000
        },
        "key": "audio-stream0"
      },
    ],
    "muxStreams": [
      {
        "key": "media-sd",
        "fileName": "media-sd.m4s",
        "container": "fmp4",
        "elementaryStreams": [
          "h265-stream0",
        ],
        "segmentSettings": {
          "individualSegments": true
        },
      },
      {
        "key": "media-hd",
        "fileName": "media-hd.m4s",
        "container": "fmp4",
        "elementaryStreams": [
          "h265-stream1",
        ],
        "segmentSettings": {
          "individualSegments": true
        },
      },
      {
        "key": "media-fhd",
        "fileName": "media-fhd.m4s",
        "container": "fmp4",
        "elementaryStreams": [
          "h265-stream2",
        ],
        "segmentSettings": {
          "individualSegments": true
        },
      },
      {
        "key": "audio-only",
        "fileName": "audio-only.m4s",
        "container": "fmp4",
        "elementaryStreams": [
          "audio-stream0"
        ],
        "segmentSettings": {
          "individualSegments": true
        },
      },
    ],
    "manifests": [
      {
        "fileName": "manifest-h265.mpd",
        "type": "DASH",
        "muxStreams": [
          "media-sd",
          "media-hd",
          "media-fhd",
          "audio-only",
        ]
      },
    ]
  }
}
EOF

curl -X POST \
-H "Authorization: Bearer "$(gcloud auth application-default print-access-token) \
-H "Content-Type: application/json; charset=utf-8" \
-d @request.json \
https://transcoder.googleapis.com/v1beta1/projects/MY_PROJECT/locations/asia-east1/jobTemplates?jobTemplateId=test-template


    


    #!/bin/bash -eu

cat > request.json << EOF
{
  "inputUri": "gs://my-bucket/input.mp4",
  "outputUri": "gs://my-bucket/output/",
  "templateId": "test-template"
}
EOF

curl -X POST \
-H "Authorization: Bearer "$(gcloud auth application-default print-access-token) \
-H "Content-Type: application/json; charset=utf-8" \
-d @request.json \
https://transcoder.googleapis.com/v1beta1/projects/MY_PROJECT/locations/asia-east1/jobs


    


    The following is a ffprobe of the resulting manifest file, which is 2 seconds shorter than specified. (expected : 00:02:47.00, actual : 00:02:45.00) In this case, it's a 2-second gap, but it can be 10 seconds or 30 seconds, and it varies from video to video.

    


    ❯ ffprobe manifest-h265.mpd
ffprobe version 4.3.1 Copyright (c) 2007-2020 the FFmpeg developers
  built with Apple clang version 12.0.0 (clang-1200.0.32.28)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1_8 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, dash, from 'manifest-h265.mpd':
  Duration: 00:02:45.00, start: 0.000000, bitrate: 0 kb/s
  Program 0
    Stream #0:0: Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709/unknown/unknown), 686x480, 112 kb/s, 30 fps, 120 tbr, 10k tbn, 30 tbc
    Metadata:
      variant_bitrate : 113679
      id              : 113679
    Stream #0:1: Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709/unknown/unknown), 1030x720, 205 kb/s, 30 fps, 120 tbr, 10k tbn, 30 tbc
    Metadata:
      variant_bitrate : 189219
      id              : 189219
    Stream #0:2: Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709/unknown/unknown), 1544x1080, 384 kb/s, 30 fps, 120 tbr, 10k tbn, 30 tbc
    Metadata:
      variant_bitrate : 358043
      id              : 358043
    Stream #0:3: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 65 kb/s
    Metadata:
      variant_bitrate : 70245
      id              : 70245


    


    The following is the time as specified for h264 + MPEG2-TS + Apple HLS.

    


    ❯ ffprobe manifest-h264.m3u8 | pbcopy
ffprobe version 4.3.1 Copyright (c) 2007-2020 the FFmpeg developers
  built with Apple clang version 12.0.0 (clang-1200.0.32.28)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1_8 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
[hls @ 0x7fe23100f200] Opening 'h264-sd-ts.m3u8' for reading
[hls @ 0x7fe23100f200] Skip ('#EXT-X-VERSION:4')
[hls @ 0x7fe23100f200] Opening 'h264-hd-ts.m3u8' for reading
[hls @ 0x7fe23100f200] Skip ('#EXT-X-VERSION:4')
[hls @ 0x7fe23100f200] Opening 'h264-fhd-ts.m3u8' for reading
[hls @ 0x7fe23100f200] Skip ('#EXT-X-VERSION:4')
[hls @ 0x7fe23100f200] Opening 'h264-sd0000000000.ts' for reading
[hls @ 0x7fe23100f200] Opening 'h264-hd0000000000.ts' for reading
[hls @ 0x7fe23100f200] Opening 'h264-fhd0000000000.ts' for reading
Input #0, hls, from 'manifest-h264.m3u8':
  Duration: 00:02:47.00, start: 0.000000, bitrate: 0 kb/s
  Program 0
    Metadata:
      variant_bitrate : 511576
    Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 686x480, 120 tbr, 90k tbn, 2000k tbc
    Metadata:
      variant_bitrate : 511576
    Stream #0:1: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp
    Metadata:
      variant_bitrate : 511576
  Program 1
    Metadata:
      variant_bitrate : 793711
    Stream #0:2: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 1030x720, 120 tbr, 90k tbn, 2000k tbc
    Metadata:
      variant_bitrate : 793711
    Stream #0:3: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp
    Metadata:
      variant_bitrate : 793711
  Program 2
    Metadata:
      variant_bitrate : 1305288
    Stream #0:4: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 1544x1080, 120 tbr, 90k tbn, 2000k tbc
    Metadata:
      variant_bitrate : 1305288
    Stream #0:5: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp
    Metadata:
      variant_bitrate : 1305288


    


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