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• lavfi : add ff_detect_color_primaries helper

  10 avril 2022, par Niklas Haas

  lavfi : add ff_detect_color_primaries helper
  Related to #9673, this helper exists to facilitate "guessing" the right
  
  primary tags from a given set of raw primary coefficients.
  The cutoff value of 0.001 was chosen by experimentation. The smallest
  
  "false positive" delta observed in practice was 0.023329, while the
  
  largest "false negative" delta was 0.00016. So, a value of 0.001 sits
  
  comfortably in the middle.
  Signed-off-by : Niklas Haas <git@haasn.dev>
  

  • [DH] libavfilter/colorspace.c
  • [DH] libavfilter/colorspace.h

• FFMpeg crop a portrait (vertical) video square 1:1

  1er avril 2022, par hugger

  SOLVED... It was a UI issue... Not an FFpeg issue.

  


  I am new to FFMpeg. I am stuck on cropping a portrait video taken from a portrait device square.

  


  I would like my video output to be 1080x1080.

  


  First, I tried this.

  


  FFmpegKit.execute(`-y -i ${media.path} -vf "crop=1080:1080:exact=1" ${path}`)


  


  As I hoped, this worked for photos. (but strangely rotates the photo) - looking into that...

  


  BUT, for videos it does not work. instead it turns the video landscape.

  


  I then tried to add scale :

  


  FFmpegKit.execute(`-y -i ${media.path} -vf "crop=1080:1080:exact=1, scale=1080:1080" ${path}`)


  


  But this left me with the same result.

  


  Here are the console logs for some more information :

  


   LOG  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file:///private/var/mobile/Containers/Data/Application/71E462FC-4824-41FE-B28D-57AF7B6078C3/tmp/ReactNative/329ACC6F-42B6-4B12-A289-889DADE1BC3A.mov':
 LOG    Metadata:
 LOG      major_brand     :
 LOG  qt
 LOG  
 LOG      minor_version   :
 LOG  0
 LOG  
 LOG      compatible_brands:
 LOG  qt
 LOG  
 LOG      creation_time   :
 LOG  2022-04-01T03:41:12.000000Z
 LOG  
 LOG    Duration:
 LOG  00:00:02.35
 LOG  , start:
 LOG  0.000000
 LOG  , bitrate:
 LOG  21200 kb/s
 LOG  
 LOG    Stream #0:0
 LOG  [0x1]
 LOG  (und)
 LOG  : Video: hevc (hvc1 / 0x31637668), yuv420p(tv, bt709), 1080x1920, 21140 kb/s
 LOG  ,
 LOG  59.96 fps,
 LOG  59.94 tbr,
 LOG  600 tbn
 LOG   (default)
 LOG  
 LOG      Metadata:
 LOG        creation_time   :
 LOG  2022-04-01T03:41:13.000000Z
 LOG  
 LOG        handler_name    :
 LOG  Core Media Video
 LOG  
 LOG        vendor_id       :
 LOG  [0][0][0][0]
 LOG  
 LOG        encoder         :
 LOG  HEVC
 LOG  
 LOG    Stream #0:1
 LOG  [0x2]
 LOG  (und)
 LOG  : Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 61 kb/s
 LOG   (default)
 LOG  
 LOG      Metadata:
 LOG        creation_time   :
 LOG  2022-04-01T03:41:13.000000Z
 LOG  
 LOG        handler_name    :
 LOG  Core Media Audio
 LOG  
 LOG        vendor_id       :
 LOG  [0][0][0][0]
 LOG  
 LOG  [hevc @ 0x118ce07d0] The "sub_text_format" option is deprecated: Deprecated, does nothing
 LOG  [aac @ 0x10d30e190] The "sub_text_format" option is deprecated: Deprecated, does nothing
 LOG  Stream mapping:
 LOG    Stream #0:0 -> #0:0
 LOG   (hevc (native) -> mpeg4 (native))
 LOG  
 LOG    Stream #0:1 -> #0:1
 LOG   (aac (native) -> aac (native))
 LOG  
 LOG  Press [q] to stop, [?] for help
 LOG  Output #0, mp4, to '/var/mobile/Containers/Data/Application/71E462FC-4824-41FE-B28D-57AF7B6078C3/Documents/after.mp4':
 LOG    Metadata:
 LOG      major_brand     :
 LOG  qt
 LOG  
 LOG      minor_version   :
 LOG  0
 LOG  
 LOG      compatible_brands:
 LOG  qt
 LOG  
 LOG      encoder         :
 LOG  Lavf59.10.100
 LOG  
 LOG    Stream #0:0
 LOG  (und)
 LOG  : Video: mpeg4 (mp4v / 0x7634706D), yuv420p(tv, bt709, progressive), 1080x1080, q=2-31, 10000 kb/s
 LOG  ,
 LOG  59.94 fps,
 LOG  60k tbn
 LOG   (default)
 LOG  
 LOG      Metadata:
 LOG        creation_time   :
 LOG  2022-04-01T03:41:13.000000Z
 LOG  
 LOG        handler_name    :
 LOG  Core Media Video
 LOG  
 LOG        vendor_id       :
 LOG  [0][0][0][0]
 LOG  
 LOG        encoder         :
 LOG  Lavc59.15.102 mpeg4
 LOG  
 LOG      Side data:
 LOG  
 LOG  cpb:
 LOG  bitrate max/min/avg: 0/0/10000000 buffer size: 0
 LOG  vbv_delay: N/A
 LOG  
 LOG    Stream #0:1
 LOG  (und)
 LOG  : Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 69 kb/s
 LOG   (default)
 LOG  
 LOG      Metadata:
 LOG        creation_time   :
 LOG  2022-04-01T03:41:13.000000Z
 LOG  
 LOG        handler_name    :
 LOG  Core Media Audio
 LOG  
 LOG        vendor_id       :
 LOG  [0][0][0][0]
 LOG  
 LOG        encoder         :
 LOG  Lavc59.15.102 aac
 LOG  
 LOG  frame=    1 fps=0.0 q=3.6 size=       0kB time=00:00:01.06 bitrate=   0.3kbits/s speed=9.23x
 LOG  frame=   47 fps=0.0 q=2.0 size=     768kB time=00:00:01.85 bitrate=3390.0kbits/s speed=3.01x
 LOG  frame=   95 fps= 81 q=2.2 size=    1792kB time=00:00:02.32 bitrate=6313.3kbits/s speed=1.99x
 LOG  frame=  129 fps= 77 q=2.5 size=    2560kB time=00:00:02.32 bitrate=9018.9kbits/s speed=1.39x
 LOG  frame=  139 fps= 78 q=2.6 Lsize=    2953kB time=00:00:02.38 bitrate=10124.6kbits/s speed=1.34x
 LOG  video:2929kB audio:20kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead:
 LOG  0.136336%
 LOG  
 LOG  [aac @ 0x112820f50] Qavg: 113.412
 LOG  COMPLETED
 LOG  {}


  


  This is the result, when i replace
-i {media} with
-f lavfi -i smptebars=r=60000/1001:s=1080x1920:d=1

  


  

  


  ALMOST but not 1:1...

  


  I have not had any luck online trying to find a solution for this so I have decided to post on here.

  


  I hope I can get some guidance here !

  


  Cheers.

  


• lavfi : generalize colorspace coefficent helpers

  9 avril 2022, par Niklas Haas

  lavfi : generalize colorspace coefficent helpers
  These are needed beyond just vf_colorspace, so give them a new home in
  
  colorspace.h.
  In addition to moving code around, also merge the white point and
  
  primary coefficients into a single struct to slightly increase the
  
  convenience and shrink the size of the new API by avoiding the need
  
  to introduce an extra function just to look up the white point as well.
  
  The only place the distinction matters is in a single enum comparison,
  
  which can just as well be a single memcpy - the difference is
  
  negligible.
  Signed-off-by : Niklas Haas <git@haasn.dev>
  

  • [DH] libavfilter/colorspace.c
  • [DH] libavfilter/colorspace.h
  • [DH] libavfilter/vf_colorspace.c