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• Creating mosaic stack 25 videos ffmpeg windows cmd

  26 décembre 2019, par KIngking431

  Hi I am trying to make a video mosaic of 25 videos in ffmpeg

  I used Jim B’s perl script to make this script, previous on my mac it worked.
  But I can’t get it to work on my windows computer in command prompt.
  I think it executes each line of code individually

  ffmpeg \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Aarhus H 2019-12-25 15-06-03.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Aller°d 2019-10-15 17-09-32.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Ballerup St. 2019-10-19 10-58-47.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Charlottenlund.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Cph Lufthavn 2019-11-23 12-49-47.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Dyssegσrd St. 2019-10-29 19-41-17.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Ejby St. 2019-10-30 19-28-05.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Fruens B°ge St.2019-11-04 08-34-53.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Give St. 2019-11-05 12-49-39.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Hjerm St. 2019-11-13 13-40-01.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Islev St.2019-11-18 11-40-19.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Jyderup St.2019-11-19 08-18-10.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Kildebakke St 2019-11-20 20-15-20.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Lem St.2019-11-24 06-51-02.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Middelpart St 2019-11-24 19-07-51.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//N°rre Aaby St 2019-11-26 17-01-06.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Ordrup St 2019-11-28 12-10-28.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Padborg St 2019-11-28 14-05-33.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Roskilde St. 2019-12-02 11-53-34.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Snedsted St. 2019-12-06 17-06-49.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Trekroner St. 2019-12-12 20-39-38.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Ulstrup St. 2019-12-16 09-58-18.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Vojens St. 2019-12-19 12-02-10.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//Ydby St. 2019-12-25 16-55-38.mkv \
  
     -i C:/Users/Privat/Desktop/27-videoer/normalized//╪lgod St. 2019-12-23 09-36-51.mkv \
  
    -filter_complex " \
  
        [0:v] setpts=PTS-STARTPTS, scale=qqvga [a0]; \
  
        [1:v] setpts=PTS-STARTPTS, scale=qqvga [a1]; \
  
        [2:v] setpts=PTS-STARTPTS, scale=qqvga [a2]; \
  
        [3:v] setpts=PTS-STARTPTS, scale=qqvga [a3]; \
  
        [4:v] setpts=PTS-STARTPTS, scale=qqvga [a4]; \
  
        [5:v] setpts=PTS-STARTPTS, scale=qqvga [a5]; \
  
        [6:v] setpts=PTS-STARTPTS, scale=qqvga [a6]; \
  
        [7:v] setpts=PTS-STARTPTS, scale=qqvga [a7]; \
  
        [8:v] setpts=PTS-STARTPTS, scale=qqvga [a8]; \
  
        [9:v] setpts=PTS-STARTPTS, scale=qqvga [a9]; \
  
        [10:v] setpts=PTS-STARTPTS, scale=qqvga [a10]; \
  
        [11:v] setpts=PTS-STARTPTS, scale=qqvga [a11]; \
  
        [12:v] setpts=PTS-STARTPTS, scale=qqvga [a12]; \
  
        [13:v] setpts=PTS-STARTPTS, scale=qqvga [a13]; \
  
        [14:v] setpts=PTS-STARTPTS, scale=qqvga [a14]; \
  
        [15:v] setpts=PTS-STARTPTS, scale=qqvga [a15]; \
  
        [16:v] setpts=PTS-STARTPTS, scale=qqvga [a16]; \
  
        [17:v] setpts=PTS-STARTPTS, scale=qqvga [a17]; \
  
        [18:v] setpts=PTS-STARTPTS, scale=qqvga [a18]; \
  
        [19:v] setpts=PTS-STARTPTS, scale=qqvga [a19]; \
  
        [20:v] setpts=PTS-STARTPTS, scale=qqvga [a20]; \
  
        [21:v] setpts=PTS-STARTPTS, scale=qqvga [a21]; \
  
        [22:v] setpts=PTS-STARTPTS, scale=qqvga [a22]; \
  
        [23:v] setpts=PTS-STARTPTS, scale=qqvga [a23]; \
  
        [24:v] setpts=PTS-STARTPTS, scale=qqvga [a24]; \
  
        [a0][a1][a2][a3][a4][a5][a6][a7][a8][a9][a10][a11][a12][a13][a14][a15][a16][a17][a18][a19][a20][a21][a22][a23][a24]xstack=inputs=25:layout=0_0|w0_0|w0+w1_0|w0+w1+w2_0|w0+w1+w2+w3_0|0_h0|w0_h0|w0+w1_h0|w0+w1+w2_h0|w0+w1+w2+w3_h0|0_h0+h1|w0_h0+h1|w0+w1_h0+h1|w0+w1+w2_h0+h1|w0+w1+w2+w3_h0+h1|0_h0+h1+h2|w0_h0+h1+h2|w0+w1_h0+h1+h2|w0+w1+w2_h0+h1+h2|w0+w1+w2+w3_h0+h1+h2|0_h0+h1+h2+h3|w0_h0+h1+h2+h3|w0+w1_h0+h1+h2+h3|w0+w1+w2_h0+h1+h2+h3|w0+w1+w2+w3_h0+h1+h2+h3[out] \
  
        " \
  
      -map "[out]" \
  
      -c:v libx264 -t '30' -f matroska -  | ffplay -autoexit -left 10 -top 10  -

  I tried making powershell scripts for this but with no luck, I also tried to run it in the bash implemented in cmd.
  Is there something fundamental about commandprompt I am missing ?

• AForge.Video.VideoFileWriter, Video Quality loss after a second

  29 décembre 2019, par Just another Dev

  I tried to use AForge to create mp4 video from images..but experience this quality loss after about 1 - 2 second into the video. Just wondering if anyone knows what went wrong with my code ?

  using AForge.Video.FFMPEG;
  
  VideoFileWriter writer = new VideoFileWriter();
  
  writer.Open(fileName, _width, _height, _frameRate, VideoCodec.MPEG4, 800000);
  
  var s = AForge.Imaging.Image.FromFile(@"[path]\image.jpg");
  
  int frameCount = _frameRate * scene.Time;
  
  for (int i = 0; i < frameCount; i++)
  
  {
  
      writer.WriteVideoFrame(s);
  
  }
  
  writer.Close();

  I use the above code to create a 3 second 1080p video with frame rate 60, bit rate 800k, and using this image as an example : https://www.bushandbeach.co.nz/wp-content/uploads/2019/05/A-Taste-of-Auckland-Full-Day-1-opt.jpg

  the output video is in here : https://youtu.be/j0z7711cyOM

  as you can see the image quality seems to be ok, for about 2 seconds and then it blurs out in the last second.

  Thanks so much

• ffmpeg and libx264 videos do not play on video player

  24 décembre 2019, par Tobi

  for a few months now I encountered a problem using FFmpeg in combination with the video code h264. The video generation works fine and without any errors. I am using the following script since 2015 to build my videos from single pictures :

  #!/bin/bash                                                                     
  
  # ------------------------------------------------------------------------------
  
  #                                                                               
  
  # Video generator                                                               
  
  # Tobias Holzmann                                                               
  
  # Date: 18.03.15                                                                
  
  # Update: 24.12.2019                                                            
  
  # Switch back to ffmpeg from avconv                                             
  
  #                                                                               
  
  # ------------------------------------------------------------------------------
  
  
  
  frameRate=30                                                                    
  
  vcodec="h264"                                                                   
  
  crf=18              # Between 0-51; 23 is default. 0 = lossless                 
  
  
  
  
  
  # ------------------------------------------------------------------------------
  
  
  
  ffmpeg \                                                                        
  
      -f image2 \                                                                 
  
      -r $frameRate \                                                             
  
      -i animation.%4d.png \                                                      
  
      -r $frameRate \                                                             
  
      -crf $crf \                                                                 
  
      -vcodec $vcodec \                                                           
  
      AVideo.flv                                                                  
  
  
  
  
  
  # ------------------------------------------------------------------------------

  Today I made it a bit more fancy and easier to use. However, the problem is, that all videos I generate with h264 do not play at all using the vlc player or the common Ubuntu video player. I get errors such as :

  shorty@animation: vlc AVideo.flv 
  
  VLC media player 3.0.8 Vetinari (revision 3.0.8-0-gf350b6b5a7)
  
  [000055c0e70af420] main libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
  
  [NULL @ 0x7fe318c2c2a0] Invalid NAL unit size (30490 > 15039).
  
  [NULL @ 0x7fe318c2c2a0] missing picture in access unit with size 15733
  
  [h264 @ 0x7fe318c2c2a0] Invalid NAL unit size (30490 > 15039).
  
  [h264 @ 0x7fe318c2c2a0] Error splitting the input into NAL units.
  
  [00007fe324c1c420] avcodec decoder: Using NVIDIA VDPAU Driver Shared Library  430.50  Thu Sep  5 22:38:52 CDT 2019 for hardware decoding
  
  [h264 @ 0x7fe325428ac0] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324c1fb00] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324eb9d80] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324ed6080] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324ef2400] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324f0e780] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe325428ac0] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324c1fb00] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324eb9d80] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324ed6080] hardware accelerator failed to decode picture
  
  [h264 @ 0x7fe324ef2400] hardware accelerator failed to decode picture
  
  [00007fe324c1c420] main decoder error: buffer deadlock prevented
  
  [h264 @ 0x7fe324f0e780] hardware accelerator failed to decode picture
  
  ...
  
  ...

  I am wondering if someone does know where the problem is located. Any hint or feedback is appreciated. Thank you in advance and kind regards, Tobi.