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• C# Windows Forms Using FFMPEG to change video format got no response

  21 mai 2023, par TSLee

  I am trying to make an exe program to change a video format by using FFMPEG instead of doing it in the terminal. The formatted video will be saved in the download folder. I have tried my code below and got no output response. I wonder if I used process() and StartInfo correctly, as examples I found and the documentation just confused me. I have double-checked the ffmpeg.exe is in the bin folder and the StartInfo() is just for getting information, which is under Process(). This is why Process() can access the information and use Start() to start the process. Please help and correct my understanding.
Below is part of my code :

  


  private void convertButton_Click(object sender, EventArgs e)
    {
        String input = filepathTextBox.Text;
        String outputResolution = resolutionLabel.Text;
        String output;
        String outputFileType;
        int inputLength = input.Length;
        int l = 0;
        for (int i = (inputLength - 1); inputLength > -1; i--)
        {
            if (input[i] == '.')
            {
                l = i;
                break;
            }
        }
        output = input.Substring(0, l - 1);
        outputFileType = input.Substring(l + 1, inputLength - 1);
        Process process = new Process();
        process.StartInfo.UseShellExecute = true;
        process.StartInfo.FileName = "ffmpeg.exe";
        process.StartInfo.WorkingDirectory = @"C:\Users\User\Downloads\ffmpeg-2023-05-15-git-2953ebe7b6-full_build\bin";
        process.StartInfo.Arguments = "ffmpeg -i" + @"C:\Users\User\Downloads\file_example_MP4_640_3MG.mp4" + "-s 320x240 -r 25 -b:v 500000 -pix_fmt yuv420p -c:v libx264     -vprofile baseline -level  2.1 -x264opts  stitchable=1:level=3.0:keyint=15:ref=1:merange=16:mvrange=32 -acodec pcm_s16le -ar 16000 -ac 1" + @"C:\Users\User\Downloads\440.mp4";
        process.Start();
    }


  


  Output :
"myprogram.exe(CoreCLR : clrhost) : Loaded 'C :\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.15\System.Diagnostics.Process.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled."
The thread 0x79e0 has exited with code 0 (0x0).

  


• FFmpeg uses xface to merge videos without transition effects

  30 avril 2024, par soapbar

  ffmpeg -i ./first.mp4 -i ./first.mp4 -filter_complex "xfade=transition=circlecrop:duration=1:offset=4,format=yuv420p" -y output.mp4

  


  FFMPEG version 6.1.1, the video is generated normally without any error prompts, but the generated video does not have any transition effects.

  


  output

  


  
ffmpeg version 6.1.1-tessus  https://evermeet.cx/ffmpeg/  Copyright (c) 2000-2023 the FFmpeg developers
  built with Apple clang version 11.0.0 (clang-1100.0.33.17)
  configuration : —cc=/usr/bin/clang —prefix=/opt/ffmpeg —extra-version=tessus —enable-avisynth —enable-fontconfig —enable-gpl —enable-libaom —enable-libass —enable-libbluray —enable-libdav1d —enable-libfreetype —enable-libgsm —enable-libmodplug —enable-libmp3lame —enable-libmysofa —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenh264 —enable-libopenjpeg —enable-libopus —enable-librubberband —enable-libshine —enable-libsnappy —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libtwolame —enable-libvidstab —enable-libvmaf —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxavs —enable-libxml2 —enable-libxvid —enable-libzimg —enable-libzmq —enable-libzvbi —enable-version3 —pkg-config-flags=—static —disable-ffplay
  libavutil      58. 29.100 / 58. 29.100
  libavcodec     60. 31.102 / 60. 31.102
  libavformat    60. 16.100 / 60. 16.100
  libavdevice    60.  3.100 / 60.  3.100
  libavfilter     9. 12.100 /  9. 12.100
  libswscale      7.  5.100 /  7.  5.100
  libswresample   4. 12.100 /  4. 12.100
  libpostproc    57.  3.100 / 57.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from './first.mp4' :
  Metadata :
    major_brand : isom
    minor_version : 512
    compatible_brands : isomiso2avc1mp41
    encoder : Lavf61.1.100
  Duration : 00:00:05.00, start : 0.000000, bitrate : 110 kb/s
  Stream #0:0[0x1](und) : Video : h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1080x1920 [SAR 4095:4096 DAR 36855:65536], 109 kb/s, SAR 14317:14320 DAR 128853:229120, 0.20 fps, 0.20 tbr, 16384 tbn (default)
    Metadata :
      handler_name : VideoHandler
      vendor_id : [0][0][0][0]
      encoder : Lavc61.3.100 libx264
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from './first.mp4' :
  Metadata :
    major_brand : isom
    minor_version : 512
    compatible_brands : isomiso2avc1mp41
    encoder : Lavf61.1.100
  Duration : 00:00:05.00, start : 0.000000, bitrate : 110 kb/s
  Stream #1:0[0x1](und) : Video : h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1080x1920 [SAR 4095:4096 DAR 36855:65536], 109 kb/s, SAR 14317:14320 DAR 128853:229120, 0.20 fps, 0.20 tbr, 16384 tbn (default)
    Metadata :
      handler_name : VideoHandler
      vendor_id : [0][0][0][0]
      encoder : Lavc61.3.100 libx264
Stream mapping :
  Stream #0:0 (h264) -> xfade
  Stream #1:0 (h264) -> xfade
  format:default -> Stream #0:0 (libx264)
Press [q] to stop, [?] for help
[libx264 @ 0x7f9f99fc87c0] using SAR=4095/4096
[libx264 @ 0x7f9f99fc87c0] using cpu capabilities : MMX2 SSE2Fast SSSE3 SSE4.2
[libx264 @ 0x7f9f99fc87c0] profile High, level 4.0, 4:2:0, 8-bit
[libx264 @ 0x7f9f99fc87c0] 264 - core 164 r3172 c1c9931 - H.264/MPEG-4 AVC codec - Copyleft 2003-2023 - http://www.videolan.org/x264.html - options : cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=1 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'output.mp4' :
  Metadata :
    major_brand : isom
    minor_version : 512
    compatible_brands : isomiso2avc1mp41
    encoder : Lavf60.16.100
  Stream #0:0 : Video : h264 (avc1 / 0x31637661), yuv420p(tv, progressive), 1080x1920 [SAR 14317:14320 DAR 128853:229120], q=2-31, 0.20 fps, 16384 tbn
    Metadata :
      encoder : Lavc60.31.102 libx264
    Side data :
      cpb : bitrate max/min/avg : 0/0/0 buffer size : 0 vbv_delay : N/A
[out#0/mp4 @ 0x7f9f99fc74c0] video:72kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : 1.190217%
frame=    2 fps=0.0 q=-1.0 Lsize=      73kB time=00:00:05.00 bitrate= 118.9kbits/s speed=45.5x    
[libx264 @ 0x7f9f99fc87c0] frame I:1     Avg QP:12.25  size : 72527
[libx264 @ 0x7f9f99fc87c0] frame P:1     Avg QP:13.77  size :   216
[libx264 @ 0x7f9f99fc87c0] mb I  I16..4 : 51.4% 34.9% 13.8%
[libx264 @ 0x7f9f99fc87c0] mb P  I16..4 :  0.0%  0.0%  0.0%  P16..4 :  0.8%  0.0%  0.0%  0.0%  0.0%    skip:99.2%
[libx264 @ 0x7f9f99fc87c0] 8x8 transform intra:34.9% inter:0.0%
[libx264 @ 0x7f9f99fc87c0] coded y,uvDC,uvAC intra : 9.2% 9.6% 6.9% inter : 0.0% 0.6% 0.0%
[libx264 @ 0x7f9f99fc87c0] i16 v,h,dc,p : 79% 20%  2%  0%
[libx264 @ 0x7f9f99fc87c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu :  1% 97%  2%  0%  0%  0%  0%  0%  0%
[libx264 @ 0x7f9f99fc87c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu : 36% 32% 10%  3%  3%  3%  4%  3%  4%
[libx264 @ 0x7f9f99fc87c0] i8c dc,h,v,p : 80% 15%  4%  0%
[libx264 @ 0x7f9f99fc87c0] Weighted P-Frames : Y:0.0% UV:0.0%
[libx264 @ 0x7f9f99fc87c0] kb/s:58.19


  


• Multiple format changes in FFmpeg for thermal camera

  6 février 2023, par Greynol4

  I'm having trouble generating a command to process output from a uvc thermal camera's raw data so that it can be colorized and then output to a virtual device with the intention of streaming it over rtsp. This is on a raspberry pi 3B+ with 32bit bullseye.

  


  The original code that works perfectly for previewing it is :

  


  ffmpeg -input_format yuyv422 -video_size 256x384 -i /dev/video0 -vf 'crop=h=(ih/2):y=(ih/2)' -pix_fmt yuyv422 -f rawvideo - | ffplay -pixel_format gray16le -video_size 256x192 -f rawvideo -i - -vf 'normalize=smoothing=10, format=pix_fmts=rgb48, pseudocolor=p=inferno'


  


  Essentially what this is doing is taking the raw data, cutting the useful portion out, then piping it to ffplay where it is seen as 16bit grayscale (in this case gray16le), then it is normalized, formatted to 48 bit rgb and then a pseudocolor filter is applied.

  


  I haven't been able to get this to translate into ffmpeg-only because it throws codec errors or format errors or converts the 16bit to 10bit even though I need the 16bit. I have tried using v4l2loopback and two instances of ffmpeg in separate windows to see if I could figure out where the error was actually occuring but I suspect that is introducing more format issues that are distracting from the original problem. The closest I have been able to get is

  


  ffmpeg -input_format yuyv422 -video_size 256x384 -i /dev/video0 -vf 'crop=h=(ih/2):y=(ih/2)' -pix_fmt yuyv422 -f rawvideo /dev/video3

  


  Followed by

  


  ffmpeg -video_size 256x192 -i /dev/video3  -f rawvideo -pix_fmt gray16le -vf 'normalize=smoothing=10,format=pix_fmts=rgb48, pseudocolor=p=inferno' -f rawvideo -f v4l2 /dev/video4

  


  This results in a non colorized but somewhat useful image with certain temperatures showing as missing pixels as opposed to the command with ffplay where it shows a properly colorized stream without missing pixels.

  


  I'll include my configuration and log from the preview command but the log doesn't show errors unless I try to modify parameters and presumably mess up the syntax.

  


   ffmpeg -input_format yuyv422 -video_size 256x384 -i /dev/video0 -vf 'crop=h=(ih/2):y=(ih/2)' -pix_fmt yuyv422 -f rawvideo - | ffplay -pixel_format gray16le -video_size 256x192 -f rawvideo -i - -vf 'normalize=smoothing=10, format=pix_fmts=rgb48, pseudocolor=p=inferno'
ffplay version N-109758-gbdc76f467f Copyright (c) 2003-2023 the FFmpeg developers
  built with gcc 10 (Raspbian 10.2.1-6+rpi1)
  configuration: --prefix=/usr/local --enable-nonfree --enable-gpl --enable-hardcoded-tables --disable-ffprobe --disable-ffplay --enable-libx264 --enable-libx265 --enable-sdl --enable-sdl2 --enable-ffplay
  libavutil      57. 44.100 / 57. 44.100
  libavcodec     59. 63.100 / 59. 63.100
  libavformat    59. 38.100 / 59. 38.100
  libavdevice    59.  8.101 / 59.  8.101
  libavfilter     8. 56.100 /  8. 56.100
  libswscale      6.  8.112 /  6.  8.112
  libswresample   4.  9.100 /  4.  9.100
  libpostproc    56.  7.100 / 56.  7.100
ffmpeg version N-109758-gbdc76f467f Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 10 (Raspbian 10.2.1-6+rpi1)
  configuration: --prefix=/usr/local --enable-nonfree --enable-gpl --enable-hardcoded-tables --disable-ffprobe --disable-ffplay --enable-libx264 --enable-libx265 --enable-sdl --enable-sdl2 --enable-ffplay
  libavutil      57. 44.100 / 57. 44.100
  libavcodec     59. 63.100 / 59. 63.100
  libavformat    59. 38.100 / 59. 38.100
  libavdevice    59.  8.101 / 59.  8.101
  libavfilter     8. 56.100 /  8. 56.100
  libswscale      6.  8.112 /  6.  8.112
  libswresample   4.  9.100 /  4.  9.100
  libpostproc    56.  7.100 / 56.  7.100
Input #0, video4linux2,v4l2, from '/dev/video0':B sq=    0B f=0/0   
  Duration: N/A, start: 242.040935, bitrate: 39321 kb/s
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 256x384, 39321 kb/s, 25 fps, 25 tbr, 1000k tbn
Stream mapping:.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0   
  Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
Press [q] to stop, [?] for help
Output #0, rawvideo, to 'pipe:':   0KB vq=    0KB sq=    0B f=0/0   
  Metadata:
    encoder         : Lavf59.38.100
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422(tv, progressive), 256x192, q=2-31, 19660 kb/s, 25 fps, 25 tbn
    Metadata:
      encoder         : Lavc59.63.100 rawvideo
frame=    0 fps=0.0 q=0.0 size=       0kB time=-577014:32:22.77 bitrate=  -0.0kbInput #0, rawvideo, from 'fd:':    0KB vq=    0KB sq=    0B f=0/0   
  Duration: N/A, start: 0.000000, bitrate: 19660 kb/s
  Stream #0:0: Video: rawvideo (Y1[0][16] / 0x10003159), gray16le, 256x192, 19660 kb/s, 25 tbr, 25 tbn
frame=   13 fps=0.0 q=-0.0 size=    1152kB time=00:00:00.52 bitrate=18148.4kbitsframe=   25 fps= 24 q=-0.0 size=    2304kB time=00:00:01.00 bitrate=18874.4kbitsframe=   39 fps= 25 q=-0.0 size=    3648kB time=00:00:01.56 bitrate=19156.7kbitsframe=   51 fps= 24 q=-0.0 size=    4800kB time=00:00:02.04 bitrate=19275.3kbitsframe=   64 fps= 24 q=-0.0 size=    6048kB time=00:00:02.56 bitrate=19353.6kbitsframe=   78 fps= 25 q=-0.0 size=    7392kB time=00:00:03.12 bitrate=19408.7kbits




  


  I'd also like to use the correct option so it isn't scrolling though every frame in the log as well as links to resources for adapting a command to a script for beginners even though that's outside the purview of this question so any direction on those would be much appreciated.