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• How to choose gpu among multiple nvidia gpu in ffmpeg 3.2.0 ?

  7 septembre 2018, par jsBaek

  i’m currently using two nvidia p4 graphic cards.

  In previous version of ffmpeg(before 3.2.0), i could choose specific gpu card by using options "-gpu 0 or 1 etc".

  In current version, however, there’s no option for selecting gpu card.

  Actually there’s "gpu" option specified in nvenc_h264.c or nvenc_hevc.c.

  But in nvenc.c file, there’s no code that uses "gpu" option.

  Is there any way that i can choose specific card ?

  How load balancing between two cards is done ?

  Is it done in driver level ?

  Thank you.

• Saving frames from multiple videos in a specific location using openCV/ffmpeg and Python

  15 janvier 2019, par Sparkiepandas

  I am trying to extract and save the first frame from multiple videos in a specific folder. For now I got the extraction part working but my saving is in BGR instead of the preferred RGB (if I am right).Although, the frames are shown in my notebook as RGB but not as BGR. Also I need to add some variable filename,because at the moment it saves the frames but keeps overwriting the same frame. Can you guys help me with the two specific problems ? This is what I got so far :

  SOLVED : I got the saving working, output file and colouring

  img_rows,img_cols=200,200 
  
  
  
  listing = os.listdir(r'C:\Users/Me\SVWnew\archery\train')
  
  
  
  # Create a counter
  
  counter = 0
  
  for vid in listing:
  
      vid = r"C:/Users/Me/SVWnew/archery/train/"+vid
  
      cap = cv2.VideoCapture(vid)
  
  
  
      for k in range(1):
  
          ret, frame = cap.read()
  
          rgb =cv2.resize(frame,(img_rows,img_cols))
  
          plt.imshow(rgb)
  
          plt.xticks([]), plt.yticks([])  
  
          plt.show()
  
          pathOut = r"C:/Users/Me/SVWnew - Copy/archery/train"
  
          cv2.imwrite(pathOut + "/frame%d.jpg" % counter, rgb) 
  
          counter += 1
  
          if cv2.waitKey(1) & 0xFF == ord('q'):
  
              break
  
  
  
      cap.release()
  
      cv2.destroyAllWindows()

• ffmpeg change metadata inside video file

  26 novembre 2020, par virtualsets

  Hello I have problems to change timecode insdie metadata of a video file "mov"

  


  ruta=r"E:\Brutos-sin-eliminar\inma-ruben-22-2-2020\multicam\\"
nombre=r"A019_02230134_C186.mov"
comand="ffmpeg -i " + nombre + " -ss 0 -map 0 -acodec copy -vcodec copy -timecode 01:20:10:00 -metadata:s:2:0 timecode=01:20:10:00 -metadata:s:1:0 timecode=01:20:10:00 -metadata:s:0:2 -metadata:s:0:2  timecode=01:10:10:00"+ " convert_" + nombre

os.popen(comand)


  


  I need to put muy own timecode to the file but this command not works.

  


  The console give me

  


    mov @ 00000225287fdc00] You requested a copy of the original timecode track so timecode metadata are now ignored
Output #0, mov, to 'convert_A019_02230134_C186.mov':
  Metadata:
    major_brand     : qt  
    minor_version   : 537199360
    compatible_brands: qt  
    com.blackmagic-design.camera.windowedSensor: 1
    com.apple.proapps.manufacturer: Blackmagic Design
    com.blackmagic-design.camera.uuid: 3cf1dd9e-e307-47ff-864e-5487fea3fa47
    com.blackmagic-design.camera.projectFPS: 25
    com.apple.proapps.shootingRate: 50
    com.blackmagic-design.camera.cameraType: Blackmagic Pocket Cinema Camera 4K
    com.blackmagic-design.camera.shutterAngle: 180°
    com.blackmagic-design.camera.shutterMode: Angle
    com.blackmagic-design.camera.iso: 3200
    com.blackmagic-design.camera.whiteBalanceKelvin: 3000
    com.blackmagic-design.camera.whiteBalanceTint: -44
    com.apple.proapps.customgamma: com.blackmagic-design.camera.filmlog
    com.blackmagic-design.camera.look.LUTName: Blackmagic Pocket 4K Film to Extended Video.cube
    com.blackmagic-design.camera.guides.aspectRatio: 2:1
    com.blackmagic-design.camera.guides.safeArea: 90
    com.blackmagic-design.camera.firmware: 6.6
    com.apple.proapps.clipID: A019_02230134_C186
    com.apple.proapps.reel: 19
    com.apple.proapps.scene: 1
    com.apple.proapps.shot: 99
    com.apple.proapps.isGood: 0
    com.blackmagic-design.camera.environment: interior
    com.blackmagic-design.camera.dayNight: day
    com.apple.proapps.cameraName: A
    com.blackmagic-design.camera.colorScience: Blackmagic Pocket Cinema Camera 4K, Color Science Gen 4
    com.blackmagic-design.camera.dateRecorded: 2020:02:23
    timecode        : 01:20:10:00
    encoder         : Lavf58.11.101
    Stream #0:0(eng): Video: prores (apcn / 0x6E637061), yuv422p10le(bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 122315 kb/s, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)
    Metadata:
      creation_time   : 01:10:10:00
      handler_name    : ?Apple Alias Data Handler
      encoder         : Apple ProRes 422
      timecode        : 01:10:10:00
    Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s (default)
    Metadata:
      creation_time   : 2020-02-23T00:34:02.000000Z
      handler_name    : ?Apple Alias Data Handler
      timecode        : 01:20:10:00
    Stream #0:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
    Metadata:
      creation_time   : 2020-02-23T00:34:02.000000Z
      handler_name    : ?Apple Alias Data Handler
      timecode        : 01:20:10:00
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
  Stream #0:2 -> #0:2 (copy)
Press [q] to stop, [?] for help
frame=  467 fps=0.0 q=-1.0 Lsize=  281452kB time=00:00:18.64 bitrate=123693.3kbits/s speed=71.1x    
video:278913kB audio:2531kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.002533%


  


  I dont understand why not modificate the mov file... when open the metadata it is oringinal.

  


  Reggards