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• Issue with creating an empty video and adding images using FFmpeg in C#

  14 juillet 2023, par hello world

  I'm working on a C# project where I need to create an empty video file and then add images to it using FFmpeg. However, the code I have implemented doesn't seem to be working as expected.

  


  Here's the code snippet I have :

  


  using System;
using System.Diagnostics;
using System.Drawing;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace VideoProcessingApp
{
    public partial class MainForm : Form
    {
        private bool render = false;

        public MainForm()
        {
            InitializeComponent();
        }

        private async void button6_Click(object sender, EventArgs e)
        {
            ProcessStartInfo createVideoInfo = new ProcessStartInfo
            {
                FileName = "ffmpeg.exe",
                Arguments = $"-f lavfi -i nullsrc -t 10 -s {pictureBox2.Width}x{pictureBox2.Height} -r 30 -c:v libx264 output.mp4",
                UseShellExecute = false,
                RedirectStandardOutput = true,
                RedirectStandardError = true,
                CreateNoWindow = true
            };

            using (Process createVideoProcess = new Process())
            {
                createVideoProcess.StartInfo = createVideoInfo;
                createVideoProcess.Start();

                render = true;
                await Task.Run(() =>
                {
                    for (int i = 0; i < 10; i++)
                    {
                        if (!render)
                            break;

                        Bitmap bmp = new Bitmap(1, 1);
                        pictureBox1.Invoke((MethodInvoker)(() =>
                        {
                            bmp = (Bitmap)pictureBox1.Image.Clone();
                        }));

                        while (bmp == pictureBox1.Image)
                        {
                            Thread.Sleep(10);
                        }

                        bmp.Save("a.jpg");

                        ProcessStartInfo addImageInfo = new ProcessStartInfo
                        {
                            FileName = "ffmpeg.exe",
                            Arguments = $"-i output.mp4 -i a.jpg -filter_complex \"overlay=10:10\" -c:v libx264 -c:a copy -f mp4 -",
                            UseShellExecute = false,
                            RedirectStandardOutput = true,
                            RedirectStandardError = true,
                            RedirectStandardInput = true,
                            CreateNoWindow = true
                        };

                        using (Process addImageProcess = new Process())
                        {
                            addImageProcess.StartInfo = addImageInfo;
                            addImageProcess.Start();

                            addImageProcess.WaitForExit();
                        }
                    }
                });
            }

            File.Delete("a.jpg");
        }
    }
}


  


  In this code, I'm attempting to create an empty video by executing an FFmpeg command to generate a nullsrc video. Then, I'm using a loop to capture images from a PictureBox control and overlay them onto the video using FFmpeg.

  


  The issue I'm facing is that the video is not being created at all. I have verified that FFmpeg is installed on my system and the paths to the FFmpeg executable are correct.

  


  I would appreciate any insights or suggestions on what could be causing this issue and how to resolve it. Thank you !

  


• ffmpeg trimming frame freeze issue

  20 juin 2023, par Raymond

  I used these command to trim the video :

  


  without re-encode

  


  ffmpeg -i input.mp4 -to 00:06:49 -c copy out1.ts ffmpeg -ss 00:07:13 -i input.mp4 -c copy out2.ts ffmpeg -i 'concat:out1.ts|out2.ts' -c copy output3.mp4

  


  with re-encode

  


  ffmpeg -i output000.mp4 -to 00:06:47.430 -c:v libx264 -c:a aac -avoid_negative_ts 1 out1.mp4 ffmpeg -ss 00:07:13.399 -i output000.mp4 -c:v libx264 -c:a aac -avoid_negative_ts 1 out2.mp4 ffmpeg -i 'concat:out1.mp4|out2.mp4' -c copy output3.mp4

  


  ---

  


  ffmpeg -i input.ts -to 00:06:49 -c:v libx264 -c:a aac -strict experimental out1.ts ffmpeg -ss 00:07:13 -i input.ts -c:v libx264 -c:a aac -strict experimental out2.ts ffmpeg -i "concat:out1.ts|out2.ts" -c:v copy -c:a copy output3.ts

  


  ---

  


  ffmpeg -i input.mp4 -to 00:06:49 -c:v libx264 -c:a aac -avoid_negative_ts 1 out1.mp4 ffmpeg -ss 00:07:13 -i input.mp4 -c:v libx264 -c:a aac -avoid_negative_ts 1 out2.mp4 ffmpeg -i 'concat:out1.mp4|out2.mp4' -c copy output3.mp4

  


  ---

  


  ffmpeg -i input.mp4 -to 00:06:49 -c:v libx264 -c:a aac -strict experimental out1.mp4 ffmpeg -ss 00:07:13 -i input.mp4 -c:v libx264 -c:a aac -strict experimental out2.mp4 ffmpeg -i 'concat:out1.mp4|out2.mp4' -c copy output3.mp4

  


  ---

  


  ffmpeg -i input.ts -to 00:06:49 -c:v libx264 -c:a aac out1.ts ffmpeg -ss 00:07:13 -i input.ts -c:v libx264 -c:a aac  out2.ts ffmpeg -i "concat:out1.ts|out2.ts" -c:v copy -c:a copy output3.ts

  


  These command are works, but it causes the video to freeze for about 1 second wherever I trim it. I have attached a video below to provide an example of the freeze frame issue.

  


  example : https://jumpshare.com/v/r510dpNflKUFJEFXQXlP

  


  I tried to trim the video, and it was successfully trimmed. However, the issue of frame freezing still exists in the video

  


• FFMPEG issue with concat video made from single image

  12 mai 2023, par Jacob

  I am pulling my hair out right now. I am developing a video editing program. When I export two videos, concat works great. However, when I create a video from a single image (title screen) and try to concat that video with a regular video, only the title screen is exported. And no errors.

  


  Below is the code for creating the title screen :

  


  parameters = "-loop 1 -i " + '"' + video.VideoThumbPath + '"' + " -c:v libx264 -t " + video.TitleDuration.ToString() + " -pix_fmt yuv420p " + vidPath + @"\v" + outputFile.ToString() + ".MP4";


  


  Below is the code for exporting a regular non title screen video :

  


  parameters = "-y -i " + '"' + frames[0].VideoPath + '"' + " -filter_complex " + '"' + @"[0:v]trim=" + frames[0].TimeCode.TotalSeconds + @":" + frames[1].TimeCode.TotalSeconds +
                           @", setpts=PTS-STARTPTS[trimedv0];[trimedv0]yadif," + orientation + @"setsar=1/1, eq=contrast=1:brightness=" + video.Brightness + '"' + " -sn -an -c:v libx264 -preset ultrafast -profile:v baseline -level 3.0 " +
                           @"-pix_fmt yuv420p -f mpegts " + vidPath + @"\v" + outputFile.ToString() + ".MP4";


  


  Below is the code to concat both videos :

  


  parameters = "-probesize 100M -analyzeduration 100M -i concat:" + '"' + concatString + '"' + @" -c:v copy " + '"' + ExportOptions.CompleteDestinationPath + '"';


  


  Like I said, using this code for two MP4 video that were not made from a single image, it works great. If I create a MP4 from a single image with a duration of 5 seconds and concat it with a normal MP4, only the title screen is exported.

  


  Below is the output from FFMPEG. It shows the concat string with 2 videos but only concats the first one.

  


  09:59:32:366    ffmpeg version N-110043-gadb5f7b41f-20230318 Copyright (c) 2000-2023 the FFmpeg developers


  


  09:59:32:366 built with gcc 12.2.0 (crosstool-NG 1.25.0.90_cf9beb1)
09:59:32:366 configuration : —prefix=/ffbuild/prefix —pkg-config-flags=—static —pkg-config=pkg-config —cross-prefix=x86_64-w64-mingw32- —arch=x86_64 —target-os=mingw32 —enable-gpl —enable-version3 —disable-debug —disable-w32threads —enable-pthreads —enable-iconv —enable-libxml2 —enable-zlib —enable-libfreetype —enable-libfribidi —enable-gmp —enable-lzma —enable-fontconfig —enable-libvorbis —enable-opencl —disable-libpulse —enable-libvmaf —disable-libxcb —disable-xlib —enable-amf —enable-libaom —enable-libaribb24 —enable-avisynth —enable-chromaprint —enable-libdav1d —enable-libdavs2 —disable-libfdk-aac —enable-ffnvcodec —enable-cuda-llvm —enable-frei0r —enable-libgme —enable-libkvazaar —enable-libass —enable-libbluray —enable-libjxl —enable-libmp3lame —enable-libopus —enable-librist —enable-libssh —enable-libtheora —enable-libvpx —enable-libwebp —enable-lv2 —disable-libmfx —enable-libvpl —enable-openal —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenh264 —enable-libopenjpeg —enable-libopenmpt —enable-librav1e —enable-librubberband —enable-schannel —enable-sdl2 —enable-libsoxr —enable-libsrt —enable-libsvtav1 —enable-libtwolame —enable-libuavs3d —disable-libdrm —disable-vaapi —enable-libvidstab —enable-vulkan —enable-libshaderc —enable-libplacebo —enable-libx264 —enable-libx265 —enable-libxavs2 —enable-libxvid —enable-libzimg —enable-libzvbi —extra-cflags=-DLIBTWOLAME_STATIC —extra-cxxflags= —extra-ldflags=-pthread —extra-ldexeflags= —extra-libs=-lgomp —extra-version=20230318
09:59:32:366 libavutil 58. 4.100 / 58. 4.100
09:59:32:366 libavcodec 60. 6.101 / 60. 6.101
09:59:32:366 libavformat 60. 4.100 / 60. 4.100
09:59:32:366 libavdevice 60. 2.100 / 60. 2.100
09:59:32:366 libavfilter 9. 4.100 / 9. 4.100
09:59:32:366 libswscale 7. 2.100 / 7. 2.100
09:59:32:366 libswresample 4. 11.100 / 4. 11.100
09:59:32:366 libpostproc 57. 2.100 / 57. 2.100
09:59:32:366 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'concat:C :\Users\JDINES\AppData\Roaming\FCS\VidBin\v1000.MP4|C :\Users\JDINES\AppData\Roaming\FCS\VidBin\v1001.MP4' :
09:59:32:366 Metadata :
09:59:32:366 major_brand : isom
09:59:32:366 minor_version : 512
09:59:32:366 compatible_brands : isomiso2avc1mp41
09:59:32:366 encoder : Lavf60.4.100
09:59:32:366 Duration : 00:00:05.00, start : 0.000000, bitrate : 64102 kb/s
09:59:32:366 Stream #0:00x1 : Video : h264 (High) (avc1 / 0x31637661), yuv420p(tv, unknown/bt709/iec61966-2-1, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 18 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
09:59:32:366 Metadata :
09:59:32:366 handler_name : VideoHandler
09:59:32:366 vendor_id : [0][0][0][0]
09:59:32:366 encoder : Lavc60.6.101 libx264
09:59:32:366 Output #0, mp4, to 'C :\Users\JDINES\Desktop\EXPORT TEST\qwe.MP4' :
09:59:32:366 Metadata :
09:59:32:366 major_brand : isom
09:59:32:366 minor_version : 512
09:59:32:366 compatible_brands : isomiso2avc1mp41
09:59:32:366 encoder : Lavf60.4.100
09:59:32:366 Stream #0:0(und) : Video : h264 (High) (avc1 / 0x31637661), yuv420p(tv, unknown/bt709/iec61966-2-1, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 18 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
09:59:32:366 Metadata :
09:59:32:366 handler_name : VideoHandler
09:59:32:366 vendor_id : [0][0][0][0]
09:59:32:366 encoder : Lavc60.6.101 libx264
09:59:32:366 Stream mapping :
09:59:32:366 Stream #0:0 -> #0:0 (copy)
09:59:32:366 Press [q] to stop, [?] for help
09:59:32:366 frame= 0 fps=0.0 q=-1.0 size= 0kB time=-00:00:00.06 bitrate= -0.0kbits/s speed=N/A
  
frame= 150 fps=0.0 q=-1.0 Lsize= 14kB time=00:00:04.90 bitrate= 23.4kbits/s speed=2e+03x
  
09:59:32:366 video:11kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : 23.005581%

  


  Any help would be much appreciated !

  


  I figured this out finally !!!

  


  The below code fixed it :

  


  parameters = "-loop 1 -i " + '"' + video.VideoThumbPath + '"' + " -sn -an -c:v libx264 -preset ultrafast -profile:v baseline -level 3.0 " +
                           @"-t 5 -pix_fmt yuv420p -f mpegts " + vidPath + @"\v" + outputFile.ToString() + ".MP4";