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• Gstreamer AAC encoding no more supported ?

  22 juillet 2016, par Gianks

  i’d like to include AAC as one of the compatible formats in my app but i’m having troubles with its encoding.
  FAAC seems to be missing in GStreamer-1.0 Debian-derived packages (see Ubuntu) and the main reason for that (if i got it correctly) is the presence of avenc_aac (Lunchpad bugreport) as a replacement.

  I’ve tried the following :

  gst-launch-1.0 filesrc location="src.avi" ! tee name=t  t.! queue ! decodebin ! progressreport ! x264enc ! mux. t.! queue ! decodebin ! audioconvert ! audioresample ! avenc_aac compliance=-2 ! mux. avmux_mpegts name=mux ! filesink location=/tmp/test.avi

  It hangs prerolling with :

  ERROR libav :0:: AAC bitstream not in ADTS format and extradata missing

  Using mpegtsmux instead of avmux_mpegts seems to work since the file is created but it results with no working audio (with some players it’s completely unplayable).

  This is the trace of mplayer :

  Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
  
  [aac @ 0x7f2860d6c3c0]channel element 3.15 is not allocated
  
  [aac @ 0x7f2860d6c3c0]Sample rate index in program config element does not match the sample rate index configured by the container.
  
  [aac @ 0x7f2860d6c3c0]Inconsistent channel configuration.
  
  [aac @ 0x7f2860d6c3c0]get_buffer() failed
  
  [aac @ 0x7f2860d6c3c0]Assuming an incorrectly encoded 7.1 channel layout instead of a spec-compliant 7.1(wide) layout, use -strict 1 to decode according to the specification instead.
  
  [aac @ 0x7f2860d6c3c0]Reserved bit set.
  
  [aac @ 0x7f2860d6c3c0]Number of bands (20) exceeds limit (14).
  
  [aac @ 0x7f2860d6c3c0]invalid band type
  
  [aac @ 0x7f2860d6c3c0]More than one AAC RDB per ADTS frame is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
  
  [aac @ 0x7f2860d6c3c0]Reserved bit set.
  
  [aac @ 0x7f2860d6c3c0]Number of bands (45) exceeds limit (28).
  
  Unknown/missing audio format -> no sound
  
  ADecoder init failed :(
  
  Opening audio decoder: [faad] AAC (MPEG2/4 Advanced Audio Coding)
  
  FAAD: compressed input bitrate missing, assuming 128kbit/s!
  
  AUDIO: 44100 Hz, 2 ch, floatle, 128.0 kbit/9.07% (ratio: 16000->176400)
  
  Selected audio codec: [faad] afm: faad (FAAD AAC (MPEG-2/MPEG-4 Audio))
  
  ==========================================================================
  
  AO: [pulse] 44100Hz 2ch floatle (4 bytes per sample)
  
  Starting playback...
  
  FAAD: error: Bitstream value not allowed by specification, trying to resync!
  
  FAAD: error: Invalid number of channels, trying to resync!
  
  FAAD: error: Invalid number of channels, trying to resync!
  
  FAAD: error: Bitstream value not allowed by specification, trying to resync!
  
  FAAD: error: Invalid number of channels, trying to resync!
  
  FAAD: error: Bitstream value not allowed by specification, trying to resync!
  
  FAAD: error: Channel coupling not yet implemented, trying to resync!
  
  FAAD: error: Invalid number of channels, trying to resync!
  
  FAAD: error: Invalid number of channels, trying to resync!
  
  FAAD: error: Bitstream value not allowed by specification, trying to resync!
  
  FAAD: Failed to decode frame: Bitstream value not allowed by specification 
  
  Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
  
  VO: [vdpau] 640x480 => 640x480 Planar YV12 
  
  A:3602.2 V:3600.0 A-V:  2.143 ct:  0.000   3/  3 ??% ??% ??,?% 0 0 
  
  FAAD: error: Array index out of range, trying to resync!
  
  FAAD: error: Bitstream value not allowed by specification, trying to resync!
  
  FAAD: error: Bitstream value not allowed by specification, trying to resync!
  
  FAAD: error: Unexpected fill element with SBR data, trying to resync!
  
  FAAD: error: Bitstream value not allowed by specification, trying to resync!
  
  FAAD: error: Bitstream value not allowed by specification, trying to resync!
  
  FAAD: error: Channel coupling not yet implemented, trying to resync!
  
  FAAD: error: Invalid number of channels, trying to resync!
  
  FAAD: error: PCE shall be the first element in a frame, trying to resync!
  
  FAAD: error: Invalid number of channels, trying to resync!
  
  FAAD: Failed to decode frame: Invalid number of channels 
  
  A:3602.2 V:3600.1 A-V:  2.063 ct:  0.000   4/  4 ??% ??% ??,?% 0 0 

  These the messages produced by VLC (10 seconds of playback) :

  ts info: MPEG-4 descriptor not found for pid 0x42 type 0xf
  
  core error: option sub-original-fps does not exist
  
  subtitle warning: failed to recognize subtitle type
  
  core error: no suitable demux module for `file/subtitle:///tmp//test.avi.idx'
  
  avcodec info: Using NVIDIA VDPAU Driver Shared Library 361.42 Tue Mar 22 17:29:16 PDT 2016 for hardware decoding.
  
  core warning: VoutDisplayEvent 'pictures invalid'
  
  core warning: VoutDisplayEvent 'pictures invalid'
  
  packetizer_mpeg4audio warning: Invalid ADTS header
  
  packetizer_mpeg4audio warning: ADTS CRC not supported
  
  packetizer_mpeg4audio warning: Invalid ADTS header
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio warning: Invalid ADTS header
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio warning: ADTS CRC not supported
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio warning: Invalid ADTS header
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio warning: Invalid ADTS header
  
  packetizer_mpeg4audio warning: Invalid ADTS header
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio warning: Invalid ADTS header
  
  packetizer_mpeg4audio warning: Invalid ADTS header
  
  packetizer_mpeg4audio warning: Invalid ADTS header
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio warning: Invalid ADTS header
  
  packetizer_mpeg4audio warning: Invalid ADTS header
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio warning: Invalid ADTS header
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio warning: Invalid ADTS header
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported
  
  packetizer_mpeg4audio error: Multiple blocks per frame in ADTS not supported

  Using the error of the hanging pipeline I’ve finally discovered that avenc_aac should be told in such way to output the data NOT in RAW AAC but in ADTS AAC, the point is that i’ve no idea how to do that with Gstreamer. See here, bottom of the page : FFMPEG Ticket

  At this point since i’ve found no documentation seems right to say we have no support for AAC encoding in GStreamer... which isn’t true, i guess ! (IMHO anyway seems strange the missing of FAAC if AVENC_AAC requires all the time to be set in experimental mode)

  Can someone propose a working pipeline for this ?

  UPDATE

  After some more research i’ve found (via gst-inspect on avenc_aac) what i’m probably looking for but i don’t know how to setup it as needed.
  Have a look at stream-format :

  Pad Templates:
  
    SRC template: 'src'
  
      Availability: Always
  
      Capabilities:
  
        audio/mpeg
  
                 channels: [ 1, 6 ]
  
                     rate: [ 4000, 96000 ]
  
              mpegversion: 4
  
            stream-format: raw
  
          base-profile: lc

  Thanks

• Desktop grabbing with FFmpeg at 60 fps using NVENC codec

  30 avril 2023, par Akatosh

  I'm having trouble recording my desktop at 60FPS using the latest Windows compiled FFmpeg with NVENC codec. Metadata says the file is 60 fps but when I play it, I can see clearly see it is not 60FPS.

  



  The command-line I use is the following :

  



  ffmpeg -y -rtbufsize 2000M -f gdigrab -framerate 60 -offset_x 0 -offset_y 0 -video_size 1920x1080 -i desktop -c:v h264_nvenc -preset:v fast -pix_fmt nv12 out.mp4


  



  I tried using a real time buffer, using another DirectShow device, changing the profile or forcing a bitrate, but the video always seems to be at 30fps.

  



  Recording the screen using NVIDIA's ShadowPlay works well, so I know it's feasible on my machine.

  



  Using FFprobe to check the ShadowPlay's output file I can see :

  



  


  Stream #0:0(und) : Video : h264 (High) (avc1 / 0x31637661), yuv420p(tv,
 smpte170m/smpte170m/bt470m), 1920x1080 [SAR 1:1 DAR 16:9], 4573 kb/s,
 59.38 fps, 240 tbr, 60k tbn, 120 tbc (default)

  


  



  But If I force my output to have the same bitrate and profile I get :

  



  


  Stream #0:0(und) : Video : h264 (High) (avc1 / 0x31637661), yuv420p,
 1920x1080 [SAR 1:1 DAR 16:9], 5519 kb/s, 60 fps, 60 tbr, 15360 tbn,
 120 tbc (default)

  


  



  I can see tbr and tbn are different, so I know my output is duplicating frames.

  



  For testing, all of my recordings had this 60 frame rate test page on the background, and I could clearly see the differences.

  



  I know ShadowPlay probably does a lot more under the hood than FFmpeg using the same codec. I know OBS can do it quite easily but I want to understand what I am doing wrong. Maybe it's some FFmpeg limitation ?

  



  Full console output

  



  Using -v trace command :

  



  [gdigrab @ 0000000002572cc0] Capturing whole desktop as 1920x1080x32 at (0,0)
[gdigrab @ 0000000002572cc0] Cursor pos (1850,750) -> (1842,741)
[gdigrab @ 0000000002572cc0] Probe buffer size limit of 5000000 bytes reached
[gdigrab @ 0000000002572cc0] Stream #0: not enough frames to estimate rate; consider increasing probesize
[gdigrab @ 0000000002572cc0] stream 0: start_time: 1467123648.275 duration: -9223372036854.775
[gdigrab @ 0000000002572cc0] format: start_time: 1467123648.275 duration: -9223372036854.775 bitrate=3981337 kb/s
Input #0, gdigrab, from 'desktop':
  Duration: N/A, start: 1467123648.275484, bitrate: 3981337 kb/s
    Stream #0:0, 1, 1/1000000: Video: bmp, 1 reference frame, bgra, 1920x1080 (0x0), 0/1, 3981337 kb/s, 60 fps, 1000k tbr, 1000k tbn, 1000k tbc
Successfully opened the file.
Parsing a group of options: output file out.mp4.
Applying option c:v (codec name) with argument h264_nvenc.
Applying option pix_fmt (set pixel format) with argument nv12.
Successfully parsed a group of options.
Opening an output file: out.mp4.
[file @ 0000000000e3a7c0] Setting default whitelist 'file,crypto'
Successfully opened the file.
detected 8 logical cores
[graph 0 input from stream 0:0 @ 000000000257ec00] Setting 'video_size' to value '1920x1080'
[graph 0 input from stream 0:0 @ 000000000257ec00] Setting 'pix_fmt' to value '30'
[graph 0 input from stream 0:0 @ 000000000257ec00] Setting 'time_base' to value '1/1000000'
[graph 0 input from stream 0:0 @ 000000000257ec00] Setting 'pixel_aspect' to value '0/1'
[graph 0 input from stream 0:0 @ 000000000257ec00] Setting 'sws_param' to value 'flags=2'
[graph 0 input from stream 0:0 @ 000000000257ec00] Setting 'frame_rate' to value '60/1'
[graph 0 input from stream 0:0 @ 000000000257ec00] w:1920 h:1080 pixfmt:bgra tb:1/1000000 fr:60/1 sar:0/1 sws_param:flags=2
[format @ 000000000257ffc0] compat: called with args=[nv12]
[format @ 000000000257ffc0] Setting 'pix_fmts' to value 'nv12'
[auto-inserted scaler 0 @ 00000000025802c0] Setting 'flags' to value 'bicubic'
[auto-inserted scaler 0 @ 00000000025802c0] w:iw h:ih flags:'bicubic' interl:0
[format @ 000000000257ffc0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed_null_0' and the filter 'format'
[AVFilterGraph @ 0000000000e373c0] query_formats: 4 queried, 2 merged, 1 already done, 0 delayed
[auto-inserted scaler 0 @ 00000000025802c0] w:1920 h:1080 fmt:bgra sar:0/1 -> w:1920 h:1080 fmt:nv12 sar:0/1 flags:0x4
[h264_nvenc @ 0000000000e3ca20] Nvenc initialized successfully
[h264_nvenc @ 0000000000e3ca20] 1 CUDA capable devices found
[h264_nvenc @ 0000000000e3ca20] [ GPU #0 - < GeForce GTX 670 > has Compute SM 3.0 ]
[h264_nvenc @ 0000000000e3ca20] supports NVENC
[mp4 @ 0000000000e3b580] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
Output #0, mp4, to 'out.mp4':
  Metadata:
    encoder         : Lavf57.40.101
    Stream #0:0, 0, 1/15360: Video: h264 (h264_nvenc) (Main), 1 reference frame ([33][0][0][0] / 0x0021), nv12, 1920x1080, 0/1, q=-1--1, 2000 kb/s, 60 fps, 15360 tbn, 60 tbc
    Metadata:
      encoder         : Lavc57.47.100 h264_nvenc
    Side data:
      cpb: bitrate max/min/avg: 0/0/2000000 buffer size: 4000000 vbv_delay: -1
Stream mapping:
  Stream #0:0 -> #0:0 (bmp (native) -> h264 (h264_nvenc))
Press [q] to stop, [?] for help
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
Clipping frame in rate conversion by 0.000008
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
[gdigrab @ 0000000002572cc0] Cursor pos (1850,750) -> (1842,741)
*** 35 dup!
[gdigrab @ 0000000002572cc0] Cursor pos (1850,750) -> (1842,741)
*** 7 dup!
[gdigrab @ 0000000002572cc0] Cursor pos (1850,649) -> (1850,649)
*** 1 dup!
[gdigrab @ 0000000002572cc0] Cursor pos (1858,535) -> (1858,535)
*** 3 dup!
[gdigrab @ 0000000002572cc0] Cursor pos (1859,454) -> (1859,454)
*** 2 dup!
[gdigrab @ 0000000002572cc0] Cursor pos (1865,384) -> (1865,384)
*** 2 dup!
[gdigrab @ 0000000002572cc0] Cursor pos (1846,348) -> (1846,348)
*** 3 dup!
[gdigrab @ 0000000002572cc0] Cursor pos (1770,347) -> (1770,347)
*** 2 dup!
[gdigrab @ 0000000002572cc0] Cursor pos (1545,388) -> (1545,388)
*** 4 dup!
frame=   69 fps=0.0 q=35.0 size=     184kB time=00:00:00.63 bitrate=2384.0kbits/[gdigrab @ 0000000002572cc0] Cursor pos (1523,389) -> (1519,378)


  


• Desktop grabbing with FFmpeg at 60 fps using NVENC codec

  5 juillet 2016, par Akatosh

  I’m having trouble recording my desktop at 60FPS using the latest Windows compiled FFmpeg with NVENC codec. Metadata says the file is 60 fps but when I play it, I can see clearly see it is not 60FPS.

  The command-line I use is the following :

  ffmpeg -y -rtbufsize 2000M -f gdigrab -framerate 60 -offset_x 0 -offset_y 0 -video_size 1920x1080 -i desktop -c:v h264_nvenc -preset:v fast -pix_fmt nv12 out.mp4

  I tried using a real time buffer, using another DirectShow device, changing the profile or forcing a bitrate, but the video always seems to be at 30fps.

  Recording the screen using NVIDIA’s ShadowPlay works well, so I know it’s feasible on my machine.

  Using FFprobe to check the ShadowPlay’s output file I can see :

  Stream #0:0(und) : Video : h264 (High) (avc1 / 0x31637661), yuv420p(tv,
  smpte170m/smpte170m/bt470m), 1920x1080 [SAR 1:1 DAR 16:9], 4573 kb/s,
  59.38 fps, 240 tbr, 60k tbn, 120 tbc (default)

  But If I force my output to have the same bitrate and profile I get :

  Stream #0:0(und) : Video : h264 (High) (avc1 / 0x31637661), yuv420p,
  1920x1080 [SAR 1:1 DAR 16:9], 5519 kb/s, 60 fps, 60 tbr, 15360 tbn,
  120 tbc (default)

  I can see tbr and tbn are different, so I know my output is duplicating frames.

  For testing, all of my recordings had this 60 frame rate test page on the background, and I could clearly see the differences.

  I know ShadowPlay probably does a lot more under the hood than FFmpeg using the same codec. I know OBS can do it quite easily but I want to understand what I am doing wrong. Maybe it’s some FFmpeg limitation ?

  Full console output

  Using -v trace command :

  [gdigrab @ 0000000002572cc0] Capturing whole desktop as 1920x1080x32 at (0,0)
  
  [gdigrab @ 0000000002572cc0] Cursor pos (1850,750) -> (1842,741)
  
  [gdigrab @ 0000000002572cc0] Probe buffer size limit of 5000000 bytes reached
  
  [gdigrab @ 0000000002572cc0] Stream #0: not enough frames to estimate rate; consider increasing probesize
  
  [gdigrab @ 0000000002572cc0] stream 0: start_time: 1467123648.275 duration: -9223372036854.775
  
  [gdigrab @ 0000000002572cc0] format: start_time: 1467123648.275 duration: -9223372036854.775 bitrate=3981337 kb/s
  
  Input #0, gdigrab, from 'desktop':
  
    Duration: N/A, start: 1467123648.275484, bitrate: 3981337 kb/s
  
      Stream #0:0, 1, 1/1000000: Video: bmp, 1 reference frame, bgra, 1920x1080 (0x0), 0/1, 3981337 kb/s, 60 fps, 1000k tbr, 1000k tbn, 1000k tbc
  
  Successfully opened the file.
  
  Parsing a group of options: output file out.mp4.
  
  Applying option c:v (codec name) with argument h264_nvenc.
  
  Applying option pix_fmt (set pixel format) with argument nv12.
  
  Successfully parsed a group of options.
  
  Opening an output file: out.mp4.
  
  [file @ 0000000000e3a7c0] Setting default whitelist 'file,crypto'
  
  Successfully opened the file.
  
  detected 8 logical cores
  
  [graph 0 input from stream 0:0 @ 000000000257ec00] Setting 'video_size' to value '1920x1080'
  
  [graph 0 input from stream 0:0 @ 000000000257ec00] Setting 'pix_fmt' to value '30'
  
  [graph 0 input from stream 0:0 @ 000000000257ec00] Setting 'time_base' to value '1/1000000'
  
  [graph 0 input from stream 0:0 @ 000000000257ec00] Setting 'pixel_aspect' to value '0/1'
  
  [graph 0 input from stream 0:0 @ 000000000257ec00] Setting 'sws_param' to value 'flags=2'
  
  [graph 0 input from stream 0:0 @ 000000000257ec00] Setting 'frame_rate' to value '60/1'
  
  [graph 0 input from stream 0:0 @ 000000000257ec00] w:1920 h:1080 pixfmt:bgra tb:1/1000000 fr:60/1 sar:0/1 sws_param:flags=2
  
  [format @ 000000000257ffc0] compat: called with args=[nv12]
  
  [format @ 000000000257ffc0] Setting 'pix_fmts' to value 'nv12'
  
  [auto-inserted scaler 0 @ 00000000025802c0] Setting 'flags' to value 'bicubic'
  
  [auto-inserted scaler 0 @ 00000000025802c0] w:iw h:ih flags:'bicubic' interl:0
  
  [format @ 000000000257ffc0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed_null_0' and the filter 'format'
  
  [AVFilterGraph @ 0000000000e373c0] query_formats: 4 queried, 2 merged, 1 already done, 0 delayed
  
  [auto-inserted scaler 0 @ 00000000025802c0] w:1920 h:1080 fmt:bgra sar:0/1 -> w:1920 h:1080 fmt:nv12 sar:0/1 flags:0x4
  
  [h264_nvenc @ 0000000000e3ca20] Nvenc initialized successfully
  
  [h264_nvenc @ 0000000000e3ca20] 1 CUDA capable devices found
  
  [h264_nvenc @ 0000000000e3ca20] [ GPU #0 - < GeForce GTX 670 > has Compute SM 3.0 ]
  
  [h264_nvenc @ 0000000000e3ca20] supports NVENC
  
  [mp4 @ 0000000000e3b580] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
  Output #0, mp4, to 'out.mp4':
  
    Metadata:
  
      encoder         : Lavf57.40.101
  
      Stream #0:0, 0, 1/15360: Video: h264 (h264_nvenc) (Main), 1 reference frame ([33][0][0][0] / 0x0021), nv12, 1920x1080, 0/1, q=-1--1, 2000 kb/s, 60 fps, 15360 tbn, 60 tbc
  
      Metadata:
  
        encoder         : Lavc57.47.100 h264_nvenc
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/2000000 buffer size: 4000000 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (bmp (native) -> h264 (h264_nvenc))
  
  Press [q] to stop, [?] for help
  
  cur_dts is invalid (this is harmless if it occurs once at the start per stream)
  
  Clipping frame in rate conversion by 0.000008
  
  cur_dts is invalid (this is harmless if it occurs once at the start per stream)
  
  [gdigrab @ 0000000002572cc0] Cursor pos (1850,750) -> (1842,741)
  
  *** 35 dup!
  
  [gdigrab @ 0000000002572cc0] Cursor pos (1850,750) -> (1842,741)
  
  *** 7 dup!
  
  [gdigrab @ 0000000002572cc0] Cursor pos (1850,649) -> (1850,649)
  
  *** 1 dup!
  
  [gdigrab @ 0000000002572cc0] Cursor pos (1858,535) -> (1858,535)
  
  *** 3 dup!
  
  [gdigrab @ 0000000002572cc0] Cursor pos (1859,454) -> (1859,454)
  
  *** 2 dup!
  
  [gdigrab @ 0000000002572cc0] Cursor pos (1865,384) -> (1865,384)
  
  *** 2 dup!
  
  [gdigrab @ 0000000002572cc0] Cursor pos (1846,348) -> (1846,348)
  
  *** 3 dup!
  
  [gdigrab @ 0000000002572cc0] Cursor pos (1770,347) -> (1770,347)
  
  *** 2 dup!
  
  [gdigrab @ 0000000002572cc0] Cursor pos (1545,388) -> (1545,388)
  
  *** 4 dup!
  
  frame=   69 fps=0.0 q=35.0 size=     184kB time=00:00:00.63 bitrate=2384.0kbits/[gdigrab @ 0000000002572cc0] Cursor pos (1523,389) -> (1519,378)