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• FFmpeg trying to concat two like videos but the timing is off

  9 avril 2022, par video487y43

  I am trying to concat two videos together using FFMPEG, but the output of the second video plays slow with no audio, but not only that, the time elapsed counter in the windows player counts slower as well. When I play it in VLC the timing is right but the audio is still missing.

  


  For a better explanation of this effect please watch this video. Notice how slow the counter is

  


  


  https://youtube.com/shorts/k6QD_oqTRyE?feature=share

  


  


  I know the videos have to be the same type and they are both 30 fps, mp4, same size, same tbn. Here is the ffprobe results. My goal is to make compilation videos using ffmpeg since it can combine videos very fast without re-rendering them. I get the videos from tiktok. Please let me know if I can clarify this anymore. Thanks

  


  Video 1

  


  >Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt470bg/smpte170m, progressive), 1024x576 [SAR 1:1 DAR 16:9], 622 kb/s, 30 fps, 30 tbr, 15360 tbn (default)


  


  Video 2

  


  >Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1024x576 [SAR 1:1 DAR 16:9], 760 kb/s, 30 fps, 30 tbr, 15360 tbn (default)


  


  Output video

  


  >Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1024x576 [SAR 1:1 DAR 16:9], 655 kb/s, 29.92 fps, 30 tbr, 15360 tbn (default)


  


  And here is the code during the concat process sorry for the weird format

  


  libavutil      57. 24.101 / 57. 24.101
libavcodec     59. 25.100 / 59. 25.100
libavformat    59. 20.101 / 59. 20.101
libavdevice    59.  6.100 / 59.  6.100
libavfilter     8. 29.100 /  8. 29.100
libswscale      6.  6.100 /  6.  6.100
libswresample   4.  6.100 /  4.  6.100
libpostproc    56.  5.100 / 56.  5.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001e74b5668c0] Auto-inserting h264_mp4toannexb bitstream filter
Input #0, concat, from 'mylist.txt':
  Duration: N/A, start: 0.000000, bitrate: 792 kb/s
  Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1024x576 [SAR 1:1 DAR 16:9], 760 kb/s, 30 fps, 30 tbr, 15360 tbn
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1(und): Audio: aac (HE-AACv2) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 32 kb/s
Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
Output #0, mp4, to 'output.mp4':
  Metadata:
    encoder         : Lavf59.20.101
  Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1024x576 [SAR 1:1 DAR 16:9], q=2-31, 760 kb/s, 30 fps, 30 tbr, 15360 tbn
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1(und): Audio: aac (HE-AACv2) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 32 kb/s
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]



Stream mapping:
    Stream #0:0 -> #0:0 (copy)
    Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001e74b579400] Auto-inserting h264_mp4toannexb bitstream filter

frame= 1737 fps=0.0 q=-1.0 Lsize=    5442kB time=00:00:58.14 bitrate= 766.8kbits/s speed=1.01e+03x
video:4647kB audio:736kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.084181%


  


• FFMpeg Command work in command line, but not in python script

  20 février 2015, par Fooldj

  Okay, kind of a weird problem. But I’m not sure whether it’s python, ffmpeg, or some stupid thing I’m doing wrong.

  I’m trying to take a video, and take 1 frame a second, and output that frame to an image. Right now, if i use the command line with ffmpeg :

  ffmpeg -i test.avi -r 1 -f image2 image-%3d.jpeg -pix_fmt rgb24 -vcodec rawrvideo

  It outputs about 10 images, the images look fine, awesome. Now I have this code (right now some code from some github, as I wanted stuff that i was relatively sure would work, and mine is allll convoluted)

  import subprocess as sp
  
  import numpy as np
  
  import re
  
  import cv2
  
  import time
  
  
  
  FFMPEG_BIN = r'ffmpeg.exe'
  
  INPUT_VID = 'test.avi'
  
  
  
  def getInfo():
  
      command = [FFMPEG_BIN,'-i', INPUT_VID, '-']
  
      pipe = sp.Popen(command, stdout=sp.PIPE, stderr=sp.PIPE)
  
      pipe.stdout.readline()
  
      pipe.terminate()
  
      infos = pipe.stderr.read()
  
      infos_list = infos.split('\r\n')
  
      res = re.search(' \d+x\d+ ',infos)
  
      res = [int(x) for x in res.group(0).split('x')]
  
      return res
  
  res = getInfo()
  
  command = [ FFMPEG_BIN,
  
          '-i', INPUT_VID,
  
          '-f', 'image2pipe',
  
          '-pix_fmt', 'rgb24',
  
          '-vcodec', 'rawvideo', '-']
  
  pipe = sp.Popen(command, stdout = sp.PIPE, bufsize=10**8)
  
  n = 0
  
  im2 = []
  
  try:
  
      mog = cv2.BackgroundSubtractorMOG2(120,2,True)
  
      while True:
  
          raw_image = pipe.stdout.read(res[0]*res[1]*3)
  
          # transform the byte read into a numpy array
  
          image =  np.fromstring(raw_image, dtype='uint8')
  
          image = image.reshape((res[1],res[0],3))
  
          rgbImg = image.copy()
  
  
  
          fname = ('_tmp%03d.png'%time.time())
  
          cv2.imwrite(fname, rgbImg)
  
          # throw away the data in the pipe's buffer.
  
          #pipe.stdout.flush()
  
          n += 1
  
          print n
  
  except:
  
      print 'done',n
  
      pipe.kill()
  
      cv2.destroyAllWindows()

  When I run this, I get 10 images, but they all have a Blue Tint ! I cannot for the life of me figure out why. I’ve done tons of searches, I’ve tried quite a few different codecs (usually just messes things up worse). The media info for the video file is here :

   General
  
   Complete name                            : test.avi
  
  Format                                   : AVI
  
  Format/Info                              : Audio Video Interleave
  
  File size                                : 85.0 KiB
  
  Duration                                 : 133ms
  
  Overall bit rate                         : 5 235 Kbps
  
  
  
  Video
  
  ID                                       : 0
  
  Format                                   : JPEG
  
  Codec ID                                 : MJPG
  
  Duration                                 : 133ms
  
  Bit rate                                 : 1 240 Kbps
  
  Width                                    : 640 pixels
  
  Height                                   : 480 pixels
  
  Display aspect ratio                     : 4:3
  
  Frame rate                               : 30.000 fps
  
  Color space                              : YUV
  
  Chroma subsampling                       : 4:2:2
  
  Bit depth                                : 8 bits
  
  Compression mode                         : Lossy
  
  Bits/(Pixel*Frame)                       : 0.135
  
  Stream size                              : 20.1 KiB (24%)

  Any suggestions ? It seems like it should be an RGB mixup...just not sure where at...

• How to reconstruct h264 video from raw IpCam feed

  10 avril 2014, par andrew

  I captured a raw feed from an IpCam which is normally viewed in an ActiveX control.

  The feed seems to be riddled with some kind of proprietary h.264 meta data. I don't know much about the h.264 codec but from what I've read I don't think the data is standard. It looks like this :

  67 45 00 00 8D E0 28 00  1D 00 00 00 45 00 00 00   gE...à(.....E...   
  
  00 00 01 0E 6D 11 01 00  66 6B 59 00 00 04 00 00   ....m...fkY.....     

  The feed has a variable frame rate, maybe this data has something to do with that ?

  When I tried running through FFMpeg it didn't want to know, It just said :

  Invalid data found when processing input

  I tried removing the strange looking data with php like this :

  $vid= file_get_contents('1.264');
  
  $cleanedUp=preg_replace("/\x67\x45([^\xFF]{30})/", '', $vid,-1,$count);
  
  echo $count;
  
  file_put_contents('2.264', $cleanedUp);

  I tried again with FFMpeg :

  ffmpeg -i 2.264 1.avi

  Looking a little better ; This time FFMpeg produces an avi file but it outputs a lot of errors in the process, Here is a few :

  [h264 @ 0x9f4fc00] corrupted macroblock 5 5 (total_coeff=-1)
  
  [h264 @ 0x9f4fc00] error while decoding MB 5 5
  
  [h264 @ 0x9f4fc00] slice type too large (32) at 5 5
  
  [h264 @ 0x9f4fc00] decode_slice_header error
  
  [h264 @ 0x9f4fc00] Cannot use next picture in error concealment
  
  [h264 @ 0x9f4fc00] concealing 1408 DC, 1408 AC, 1408 MV errors in P frame
  
  [h264 @ 0x9f50a80] left block unavailable for requested intra mode at 0 11
  
  [h264 @ 0x9f50a80] error while decoding MB 0 11
  
  [h264 @ 0x9f50a80] Cannot use next picture in error concealment
  
  [h264 @ 0x9f50a80] concealing 1149 DC, 1149 AC, 1149 MV errors in P frame
  
  frame=  115 fps= 26 q=15.2 size=     606kB time=00:00:09.58 bitrate= 517.7kbits/[h264 @ 0x9f50a80] corrupted macroblock 29 21 (total_coeff=-1)
  
  [h264 @ 0x9f50a80] error while decoding MB 29 21
  
  [h264 @ 0x9f50a80] Cannot use next picture in error concealment
  
  [h264 @ 0x9f50a80] concealing 680 DC, 680 AC, 680 MV errors in P frame

  The video plays, but its garbled and the speed is about 4x the correct rate. I guess because the variable frame rate data is missing ?

  I tried again with :

    ffmpeg -r 12 -i 2.264 1.avi

  Forcing the input frame rate to be 12 fps (approximately correct).

  The video plays at the correct speed now but it still looks horrible.

  Id really appreciate any help with this.

  Here is a link to the raw capture.

  Here is a link to the capture with the weird headers removed.

  Here is a link to avi produced by FFMpeg.