[FFmpeg-user] Copy of XAVC-L 50 produces jittery output and missing video frames

Barnett, Phillip phillip.barnett at itn.co.uk
Tue Sep 14 18:31:52 EEST 2021


Ffplay indicates that the original clip has 306 frames, when played through. But the console says that the final count of frames for the alleged copy is 206, which does tend to confirm that the copy seems to be dropping every third frame. I have also done a MXFdump (from BBC bmx tools) for both files, and they do seem to be quite different, although I'm not totally sure that I'm interpreting them correctly. These are available along with the original file if someone wants to test my results. (We Transfer?)

-----Original Message-----
From: Barnett, Phillip
Sent: 14 September 2021 08:46
To: 'FFmpeg user questions' <ffmpeg-user at ffmpeg.org>
Subject: RE: Copy of XAVC-L 50 produces jittery output and missing video frames

One thing I also noted, that was odd - ffmpeg seems to think that the original video is 12.5fps  ( Stream #0:0: Video: h264 (High 4:2:2), yuv422p10le(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 12.50 fps, 25 tbr, 25 tbn) rather than 50 Not sure what difference that would make.
Any ideas?


-----Original Message-----
From: Barnett, Phillip
Sent: 13 September 2021 10:41
To: FFmpeg user questions <ffmpeg-user at ffmpeg.org>
Subject: Copy of XAVC-L 50 produces jittery output and missing video frames

Hi,

I wonder if someone can shed light on what I’m doing wrong here? I am trying to make an exact copy of a Sony XAVC Long GOP 50 file (later I want to make a subclip of a section, but this is a necessary beginning)

The copies I make do not seem to be true copies – the motion is jittery, the file size is (slightly) smaller, and the framemd5 results shows oddities when compared side by side – every third video frame is dropped from the copy, and the other two are offset by one frame.

Eg if we look at the (first characters of)the hashes we see this



Frame                                                     Original                                                   Copy



0                                                                      a161…                                                  -

1                                                                         a76f…                                                 a161..

2                                                                         2f06…                                                 a76f …

3                                                                         ec60…                                                -

4                                                                         512c…                                                ec60…

5                                                                         c59d…                                                512c …

6                                                                         b239…                                                -

7                                                                         0d0d…                                                b239…



Any ideas what’s going on? I’ve tried with several versions of the exe, on Windows, including the latest git build from 2 days ago.

Many thanks

Phillip Barnett



Full, uncut console output of the encode of the copy follows.



C:\Users\barnettp>ffmpeg -i c:\XDROOT\Clip\728_0048.MXF -c copy -map 0 c:\XDROOT\Clip\728_0048_copy.mxf

ffmpeg version 2021-09-11-git-3e127b595a-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers

  built with gcc 10.3.0 (Rev5, Built by MSYS2 project)

  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint

  libavutil      57.  5.100 / 57.  5.100

  libavcodec     59.  7.103 / 59.  7.103

  libavformat    59.  5.100 / 59.  5.100

  libavdevice    59.  0.101 / 59.  0.101

  libavfilter     8.  9.100 /  8.  9.100

  libswscale      6.  1.100 /  6.  1.100

  libswresample   4.  0.100 /  4.  0.100

  libpostproc    56.  0.100 / 56.  0.100

Guessed Channel Layout for Input Stream #0.1 : mono

Guessed Channel Layout for Input Stream #0.2 : mono

Guessed Channel Layout for Input Stream #0.3 : mono

Guessed Channel Layout for Input Stream #0.4 : mono

Input #0, mxf, from 'c:\XDROOT\Clip\728_0048.MXF':

  Metadata:

    operational_pattern_ul: 060e2b34.04010101.0d010201.01010900

    uid             : 58f3390a-f1b8-1232-b09a-747a90929f67

    generation_uid  : 58f33914-f1b8-1232-89a0-747a90929f67

    company_name    : Sony

   product_name    : Mem

    product_version : 2.00

    product_uid     : cede1104-8280-11de-8a39-08004678031c

    modification_date: 2021-05-03T10:20:42.000000Z

    material_package_umid: 0x060A2B340101010501010D431300000025BF586E379305D8747A90FFFE929F67

    timecode        : 00:27:18:04

  Duration: 00:00:24.68, start: 0.000000, bitrate: 29188 kb/s

  Stream #0:0: Video: h264 (High 4:2:2), yuv422p10le(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 12.50 fps, 25 tbr, 25 tbn

    Metadata:

      file_package_umid: 0x060A2B340101010501010D431300000026BF586E379305D8747A90FFFE929F67

  Stream #0:1: Audio: pcm_s24le, 48000 Hz, mono, s32 (24 bit), 1152 kb/s

    Metadata:

      file_package_umid: 0x060A2B340101010501010D431300000026BF586E379305D8747A90FFFE929F67

  Stream #0:2: Audio: pcm_s24le, 48000 Hz, mono, s32 (24 bit), 1152 kb/s

    Metadata:

      file_package_umid: 0x060A2B340101010501010D431300000026BF586E379305D8747A90FFFE929F67

  Stream #0:3: Audio: pcm_s24le, 48000 Hz, mono, s32 (24 bit), 1152 kb/s

    Metadata:

      file_package_umid: 0x060A2B340101010501010D431300000026BF586E379305D8747A90FFFE929F67

  Stream #0:4: Audio: pcm_s24le, 48000 Hz, mono, s32 (24 bit), 1152 kb/s

    Metadata:

      file_package_umid: 0x060A2B340101010501010D431300000026BF586E379305D8747A90FFFE929F67

  Stream #0:5: Data: none

    Metadata:

      file_package_umid: 0x060A2B340101010501010D431300000026BF586E379305D8747A90FFFE929F67

      data_type       : vbi_vanc_smpte_436M

Output #0, mxf, to 'c:\XDROOT\Clip\728_0048_copy.mxf':

  Metadata:

    operational_pattern_ul: 060e2b34.04010101.0d010201.01010900

    uid             : 58f3390a-f1b8-1232-b09a-747a90929f67

    generation_uid  : 58f33914-f1b8-1232-89a0-747a90929f67

    timecode        : 00:27:18:04

    material_package_umid: 0x060A2B340101010501010D431300000025BF586E379305D8747A90FFFE929F67

    modification_date: 2021-05-03T10:20:42.000000Z

    product_uid     : cede1104-8280-11de-8a39-08004678031c

    encoder         : Lavf59.5.100

  Stream #0:0: Video: h264 (High 4:2:2), yuv422p10le(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 12.50 fps, 25 tbr, 25 tbn

    Metadata:

      file_package_umid: 0x060A2B340101010501010D431300000026BF586E379305D8747A90FFFE929F67

  Stream #0:1: Audio: pcm_s24le, 48000 Hz, mono, s32 (24 bit), 1152 kb/s

    Metadata:

      file_package_umid: 0x060A2B340101010501010D431300000026BF586E379305D8747A90FFFE929F67

  Stream #0:2: Audio: pcm_s24le, 48000 Hz, mono, s32 (24 bit), 1152 kb/s

    Metadata:

      file_package_umid: 0x060A2B340101010501010D431300000026BF586E379305D8747A90FFFE929F67

  Stream #0:3: Audio: pcm_s24le, 48000 Hz, mono, s32 (24 bit), 1152 kb/s

    Metadata:

      file_package_umid: 0x060A2B340101010501010D431300000026BF586E379305D8747A90FFFE929F67

  Stream #0:4: Audio: pcm_s24le, 48000 Hz, mono, s32 (24 bit), 1152 kb/s

    Metadata:

      file_package_umid: 0x060A2B340101010501010D431300000026BF586E379305D8747A90FFFE929F67

  Stream #0:5: Data: none

    Metadata:

      file_package_umid: 0x060A2B340101010501010D431300000026BF586E379305D8747A90FFFE929F67

      data_type       : vbi_vanc_smpte_436M

Stream mapping:

  Stream #0:0 -> #0:0 (copy)

  Stream #0:1 -> #0:1 (copy)

  Stream #0:2 -> #0:2 (copy)

  Stream #0:3 -> #0:3 (copy)

  Stream #0:4 -> #0:4 (copy)

  Stream #0:5 -> #0:5 (copy)

Press [q] to stop, [?] for help

frame=  617 fps=0.0 q=-1.0 Lsize=   86932kB time=00:00:24.68 bitrate=28855.1kbits/s speed= 169x

video:70995kB audio:13882kB subtitle:0kB other streams:316kB global headers:0kB muxing overhead: 2.040302%





Framemd5 of the original clip (cut for brevity)



#format: frame checksums

#version: 2

#hash: MD5

#software: Lavf59.5.100

#tb 0: 1/25

#media_type 0: video

#codec_id 0: rawvideo

#dimensions 0: 1920x1080

#sar 0: 1/1

#tb 1: 1/48000

#media_type 1: audio

#codec_id 1: pcm_s16le

#sample_rate 1: 48000

#channel_layout 1: 4

#channel_layout_name 1: mono

#tb 2: 1/48000

#media_type 2: audio

#codec_id 2: pcm_s16le

#sample_rate 2: 48000

#channel_layout 2: 4

#channel_layout_name 2: mono

#tb 3: 1/48000

#media_type 3: audio

#codec_id 3: pcm_s16le

#sample_rate 3: 48000

#channel_layout 3: 4

#channel_layout_name 3: mono

#tb 4: 1/48000

#media_type 4: audio

#codec_id 4: pcm_s16le

#sample_rate 4: 48000

#channel_layout 4: 4

#channel_layout_name 4: mono

#tb 5: 1/25

#media_type 5: data

#codec_id 5: none

#stream#, dts,        pts, duration,     size, hash

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1,          0,          0,     1920,     3840, 7d10c1a67ac6eaddde940ac5522d7a74

2,          0,          0,     1920,     3840, 2f213f5190a0567f3242988443643bf4

3,          0,          0,     1920,     3840, 7d10c1a67ac6eaddde940ac5522d7a74

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1,       1920,       1920,     1920,     3840, 9c40b899c6988d2e31ddf884325ff7fc

2,       1920,       1920,     1920,     3840, 0e83cae695353e8c74cb7577b3de4816

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5,          1,          1,        1,      524, 4668139579c7934bc141b0e92c1d1db6

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1,       3840,       3840,     1920,     3840, 3c3723a86397e28d656db404fca80cc5

2,       3840,       3840,     1920,     3840, a9c7a16d2938d5d7d4417b1f802594b1

3,       3840,       3840,     1920,     3840, 3c3723a86397e28d656db404fca80cc5

4,       3840,       3840,     1920,     3840, a9c7a16d2938d5d7d4417b1f802594b1

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1,      13440,      13440,     1920,     3840, 0650ffd375448f37defe154143af46a3

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3,      15360,      15360,     1920,     3840, bfd74b79e6b3d5d73b0550d26edd2339

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5,         11,         11,        1,      524, 4668139579c7934bc141b0e92c1d1db6

0,         12,         12,        1,  8294400, c63cb67c98b9fe785203295178db83f8

1,      23040,      23040,     1920,     3840, f2335860aaca7bc603e9cbe9e0b5283f

2,      23040,      23040,     1920,     3840, cd8e2b4a5469318bca380e9013804d8c

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4,      23040,      23040,     1920,     3840, cd8e2b4a5469318bca380e9013804d8c

5,         12,         12,        1,      524, 4668139579c7934bc141b0e92c1d1db6

0,         13,         13,        1,  8294400, e781f626f62eee6d364e893d8d10a7f0

1,      24960,      24960,     1920,     3840, e6029014c668386d7e9a32724fd78784

2,      24960,      24960,     1920,     3840, 1b27b244a0cce3845ffd789b1cc8bce7

3,      24960,      24960,     1920,     3840, e6029014c668386d7e9a32724fd78784

4,      24960,      24960,     1920,     3840, 1b27b244a0cce3845ffd789b1cc8bce7

5,         13,         13,        1,      524, 4668139579c7934bc141b0e92c1d1db6

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1,      26880,      26880,     1920,     3840, 93ba28f16439c408edf1ab701b9a4246

2,      26880,      26880,     1920,     3840, e3a51fbb9b11aa2e64cc5cfe6126f024

3,      26880,      26880,     1920,     3840, 93ba28f16439c408edf1ab701b9a4246

4,      26880,      26880,     1920,     3840, e3a51fbb9b11aa2e64cc5cfe6126f024

5,         14,         14,        1,      524, 4668139579c7934bc141b0e92c1d1db6

0,         15,         15,        1,  8294400, 67ab95ae164ac77f6331ce0fb5daba04



Framemd5 of the copy (cut for brevity)



#format: frame checksums

#version: 2

#hash: MD5

#software: Lavf59.5.100

#tb 0: 1/25

#media_type 0: video

#codec_id 0: rawvideo

#dimensions 0: 1920x1080

#sar 0: 1/1

#tb 1: 1/48000

#media_type 1: audio

#codec_id 1: pcm_s16le

#sample_rate 1: 48000

#channel_layout 1: 4

#channel_layout_name 1: mono

#tb 2: 1/48000

#media_type 2: audio

#codec_id 2: pcm_s16le

#sample_rate 2: 48000

#channel_layout 2: 4

#channel_layout_name 2: mono

#tb 3: 1/48000

#media_type 3: audio

#codec_id 3: pcm_s16le

#sample_rate 3: 48000

#channel_layout 3: 4

#channel_layout_name 3: mono

#tb 4: 1/48000

#media_type 4: audio

#codec_id 4: pcm_s16le

#sample_rate 4: 48000

#channel_layout 4: 4

#channel_layout_name 4: mono

#tb 5: 1/25

#media_type 5: data

#codec_id 5: none

#stream#, dts,        pts, duration,     size, hash

1,          0,          0,     1920,     3840, 7d10c1a67ac6eaddde940ac5522d7a74

2,          0,          0,     1920,     3840, 2f213f5190a0567f3242988443643bf4

3,          0,          0,     1920,     3840, 7d10c1a67ac6eaddde940ac5522d7a74

4,          0,          0,     1920,     3840, 2f213f5190a0567f3242988443643bf4

5,          0,          0,        1,      524, 4668139579c7934bc141b0e92c1d1db6

0,          1,          1,        1,  8294400, a161c52782826cbf49e7623d68cccb43

1,       1920,       1920,     1920,     3840, 9c40b899c6988d2e31ddf884325ff7fc

2,       1920,       1920,     1920,     3840, 0e83cae695353e8c74cb7577b3de4816

3,       1920,       1920,     1920,     3840, 9c40b899c6988d2e31ddf884325ff7fc

4,       1920,       1920,     1920,     3840, 0e83cae695353e8c74cb7577b3de4816

5,          1,          1,        1,      524, 4668139579c7934bc141b0e92c1d1db6

0,          2,          2,        1,  8294400, a76fd8978b5f0f1bf83962f0608295d7

1,       3840,       3840,     1920,     3840, 3c3723a86397e28d656db404fca80cc5

2,       3840,       3840,     1920,     3840, a9c7a16d2938d5d7d4417b1f802594b1

3,       3840,       3840,     1920,     3840, 3c3723a86397e28d656db404fca80cc5

4,       3840,       3840,     1920,     3840, a9c7a16d2938d5d7d4417b1f802594b1

5,          2,          2,        1,      524, 4668139579c7934bc141b0e92c1d1db6

1,       5760,       5760,     1920,     3840, 47302b7581a8a780e63b92dcc32b6263

2,       5760,       5760,     1920,     3840, 6ded8db929afe9e5ef012901464ffbfd

3,       5760,       5760,     1920,     3840, 47302b7581a8a780e63b92dcc32b6263

4,       5760,       5760,     1920,     3840, 6ded8db929afe9e5ef012901464ffbfd

5,          3,          3,        1,      524, 4668139579c7934bc141b0e92c1d1db6

0,          4,          4,        1,  8294400, ec60a380ed637d1a41fcbb8286d85090

1,       7680,       7680,     1920,     3840, 29ceec80b915f86b583a9ae3f94c5214

2,       7680,       7680,     1920,     3840, 313d7033383ee25d5a5ac1f79de95fb3

3,       7680,       7680,     1920,     3840, 29ceec80b915f86b583a9ae3f94c5214

4,       7680,       7680,     1920,     3840, 313d7033383ee25d5a5ac1f79de95fb3

5,          4,          4,        1,      524, 4668139579c7934bc141b0e92c1d1db6

0,          5,          5,        1,  8294400, 512c25aeb19342fee2900de07a149c39

1,       9600,       9600,     1920,     3840, 414d7a58fad8be4aace142a02c4bb40e

2,       9600,       9600,     1920,     3840, bf98df4594ed2dae8b524138a9931166

3,       9600,       9600,     1920,     3840, 414d7a58fad8be4aace142a02c4bb40e

4,       9600,       9600,     1920,     3840, bf98df4594ed2dae8b524138a9931166

5,          5,          5,        1,      524, 4668139579c7934bc141b0e92c1d1db6

1,      11520,      11520,     1920,     3840, 556eae89b93b0d6b96f6cf37270f4ada

2,      11520,      11520,     1920,     3840, a7da6537bbb44e6b69e86bc2fa8a0f92

3,      11520,      11520,     1920,     3840, 556eae89b93b0d6b96f6cf37270f4ada

4,      11520,      11520,     1920,     3840, a7da6537bbb44e6b69e86bc2fa8a0f92

5,          6,          6,        1,      524, 4668139579c7934bc141b0e92c1d1db6

0,          7,          7,        1,  8294400, b239b8d5c178897e07d088cd737ce7c9

1,      13440,      13440,     1920,     3840, 0650ffd375448f37defe154143af46a3

2,      13440,      13440,     1920,     3840, f46c134df5fb03741555907a868c846e

3,      13440,      13440,     1920,     3840, 0650ffd375448f37defe154143af46a3

4,      13440,      13440,     1920,     3840, f46c134df5fb03741555907a868c846e

5,          7,          7,        1,      524, 4668139579c7934bc141b0e92c1d1db6

0,          8,          8,        1,  8294400, 0d0d7c13ec26b6948cfc2e1f3d3e56cd

1,      15360,      15360,     1920,     3840, bfd74b79e6b3d5d73b0550d26edd2339

2,      15360,      15360,     1920,     3840, dc5df7c4fd5eb9faae36d052be73a3b7

3,      15360,      15360,     1920,     3840, bfd74b79e6b3d5d73b0550d26edd2339

4,      15360,      15360,     1920,     3840, dc5df7c4fd5eb9faae36d052be73a3b7

5,          8,          8,        1,      524, 4668139579c7934bc141b0e92c1d1db6

1,      17280,      17280,     1920,     3840, 7253f613f6e6bc0e4722144f41679a19

2,      17280,      17280,     1920,     3840, f242dc51f8c94106fc52fde46fadab77

3,      17280,      17280,     1920,     3840, 7253f613f6e6bc0e4722144f41679a19

4,      17280,      17280,     1920,     3840, f242dc51f8c94106fc52fde46fadab77

5,          9,          9,        1,      524, 4668139579c7934bc141b0e92c1d1db6

0,         10,         10,        1,  8294400, bc18a86f1bfc6c8fec2df828dea26481

1,      19200,      19200,     1920,     3840, 978e01ae429903db328a4e8e53505516

2,      19200,      19200,     1920,     3840, 473be62a05e1668c2e0945bd93db222f

3,      19200,      19200,     1920,     3840, 978e01ae429903db328a4e8e53505516

4,      19200,      19200,     1920,     3840, 473be62a05e1668c2e0945bd93db222f

5,         10,         10,        1,      524, 4668139579c7934bc141b0e92c1d1db6

0,         11,         11,        1,  8294400, 1ecd9542cc8846d3a4d75a53c3644b6b

1,      21120,      21120,     1920,     3840, 314608bcb8d69b5fa0a885f4479e80a9

2,      21120,      21120,     1920,     3840, aea2f3aae5c1e6f6fca0d894a91154ba

3,      21120,      21120,     1920,     3840, 314608bcb8d69b5fa0a885f4479e80a9

4,      21120,      21120,     1920,     3840, aea2f3aae5c1e6f6fca0d894a91154ba

5,         11,         11,        1,      524, 4668139579c7934bc141b0e92c1d1db6

1,      23040,      23040,     1920,     3840, f2335860aaca7bc603e9cbe9e0b5283f

2,      23040,      23040,     1920,     3840, cd8e2b4a5469318bca380e9013804d8c

3,      23040,      23040,     1920,     3840, f2335860aaca7bc603e9cbe9e0b5283f

4,      23040,      23040,     1920,     3840, cd8e2b4a5469318bca380e9013804d8c

5,         12,         12,        1,      524, 4668139579c7934bc141b0e92c1d1db6

0,         13,         13,        1,  8294400, c63cb67c98b9fe785203295178db83f8

1,      24960,      24960,     1920,     3840, e6029014c668386d7e9a32724fd78784

2,      24960,      24960,     1920,     3840, 1b27b244a0cce3845ffd789b1cc8bce7

3,      24960,      24960,     1920,     3840, e6029014c668386d7e9a32724fd78784

4,      24960,      24960,     1920,     3840, 1b27b244a0cce3845ffd789b1cc8bce7

5,         13,         13,        1,      524, 4668139579c7934bc141b0e92c1d1db6

0,         14,         14,        1,  8294400, e781f626f62eee6d364e893d8d10a7f0

1,      26880,      26880,     1920,     3840, 93ba28f16439c408edf1ab701b9a4246

2,      26880,      26880,     1920,     3840, e3a51fbb9b11aa2e64cc5cfe6126f024

3,      26880,      26880,     1920,     3840, 93ba28f16439c408edf1ab701b9a4246

4,      26880,      26880,     1920,     3840, e3a51fbb9b11aa2e64cc5cfe6126f024

5,         14,         14,        1,      524, 4668139579c7934bc141b0e92c1d1db6

1,      28800,      28800,     1920,     3840, 94f40cff36e5c37ac9ff6350a0676be4

2,      28800,      28800,     1920,     3840, 4a74f81dd3d6d37ef4f44847bf362d84

3,      28800,      28800,     1920,     3840, 94f40cff36e5c37ac9ff6350a0676be4

4,      28800,      28800,     1920,     3840, 4a74f81dd3d6d37ef4f44847bf362d84

5,         15,         15,        1,      524, 4668139579c7934bc141b0e92c1d1db6





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