[FFmpeg-user] Pullup filter is introducing chroma lag

morgan holly morganh at mac.com
Tue Mar 8 23:29:06 EET 2022



> On Mar 8, 2022, at 12:07 PM, Paul B Mahol <onemda at gmail.com> wrote:
> 
> On 3/8/22, morgan holly via ffmpeg-user <ffmpeg-user at ffmpeg.org <mailto:ffmpeg-user at ffmpeg.org>> wrote:
>> Hi,
>> 
>> I’m trying to remove telecine from a prores mov file using the pullup
>> filter:
>> 
>> Source file:
>> Video: prores (LT), top coded first (swapped)), 720x480, 29.97 fps, 29.97
>> tbr, 30k tbn, 30k tbc (default)
>> 
>> Command:
>> ffmpeg -i pullup_test.mov -an -vf pullup -r 24000/1001 -pix_fmt yuv420p -y
>> pullup_test1.mov
>> 
>> Result:
>> Every fourth frame on the 23.976 output has chroma lag (3/2 removed from
>> luma, but chroma is still interlaced). Dejudder doesn’t fix it and
>> fieldmatch+decimate does worse things.
>> 
>> Test sources:
>> I’ve seen the artifact on both live action and clean animation sources. I
>> cannot share the sources but created a short example that can be used to
>> recreate the issue:
>> 
>> Test source with 3/2:
>> http://videopress.s3.amazonaws.com/misc/pullup_test.mov
>> <http://videopress.s3.amazonaws.com/misc/pullup_test.mov <http://videopress.s3.amazonaws.com/misc/pullup_test.mov>>
>> 
>> Test pullup 23.976 output:
>> http://videopress.s3.amazonaws.com/misc/pullup_test_1.mov <http://videopress.s3.amazonaws.com/misc/pullup_test_1.mov>
>> <http://videopress.s3.amazonaws.com/misc/pullup_test_1.mov <http://videopress.s3.amazonaws.com/misc/pullup_test_1.mov>>
>> 
>> Thanks for any help!
>> 
>> FFMPEG output:
>> 
>> ffmpeg -i /Volumes/Drive5/videopress_testing/pullup_test.mov -an -vf pullup
> 
> Your input is yuv422p10, thus use format filter before
> pullup/fieldmatch to get proper results.
> 
> Pullup and fieldmatch internally works only with 8 bit depth formats,
> (fieldmatch additionally supports post processing input that can be
> used to get back 10 bit output)
> 
> thus -vf format=yuv422p,pullup .... is one possible processing version.
> 
> Otherwise, yuv420p is picked and pullup/fieldmatch get yuv420p
> processing of auto inserted scale filter which is not aware that input
> is telecined, and messes up the chroma plane when downsampling to
> worse quality pixel format.

That fixed it Paul! Thank you. So, you’re saying the internal processing of pullup is limited to 8 bit? Then I would need truncate to filter then bit-stuff to get back to 10 bit for a ProRes output? Ouch.

Thanks again!

Morgan


> 
> 
> 
>> -r 24000/1001 -pix_fmt yuv420p -y
>> /Volumes/Drive5/videopress_testing/pullup_test1.mov
>> ffmpeg version 4.4.1 Copyright (c) 2000-2021 the FFmpeg developers
>>  built with Apple clang version 13.0.0 (clang-1300.0.29.3)
>>  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.4.1_3 --enable-shared
>> --enable-pthreads --enable-version3 --cc=clang --host-cflags=
>> --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom
>> --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus
>> --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy
>> --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab
>> --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp
>> --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid
>> --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r
>> --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb
>> --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq
>> --enable-libzimg --disable-libjack --disable-indev=jack --enable-avresample
>> --enable-videotoolbox
>>  libavutil      56. 70.100 / 56. 70.100
>>  libavcodec     58.134.100 / 58.134.100
>>  libavformat    58. 76.100 / 58. 76.100
>>  libavdevice    58. 13.100 / 58. 13.100
>>  libavfilter     7.110.100 /  7.110.100
>>  libavresample   4.  0.  0 /  4.  0.  0
>>  libswscale      5.  9.100 /  5.  9.100
>>  libswresample   3.  9.100 /  3.  9.100
>>  libpostproc    55.  9.100 / 55.  9.100
>> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
>> '/Volumes/Drive5/videopress_testing/pullup_test.mov':
>>  Metadata:
>>    major_brand     : qt
>>    minor_version   : 537199360
>>    compatible_brands: qt
>>    creation_time   : 2022-03-08T16:50:01.000000Z
>>  Duration: 00:00:13.41, start: 0.000000, bitrate: 2465 kb/s
>>  Stream #0:0(eng): Video: prores (LT) (apcs / 0x73637061), yuv422p10le(tv,
>> smpte170m/smpte170m/bt709, top coded first (swapped)), 720x480, 1840 kb/s,
>> SAR 10:11 DAR 15:11, 29.97 fps, 29.97 tbr, 30k tbn, 30k tbc (default)
>>    Metadata:
>>      creation_time   : 2022-03-08T16:50:01.000000Z
>>      handler_name    : Apple Video Media Handler
>>      vendor_id       : appl
>>      encoder         : Apple ProRes 422 LT
>>      timecode        : 00:00:00;00
>>  Stream #0:1(eng): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
>>    Metadata:
>>      creation_time   : 2022-03-08T16:50:01.000000Z
>>      handler_name    : Time Code Media Handler
>>      timecode        : 00:00:00;00
>> Stream mapping:
>>  Stream #0:0 -> #0:0 (prores (native) -> h264 (libx264))
>> Press [q] to stop, [?] for help
>> [libx264 @ 0x7fba5f822000] using SAR=10/11
>> [libx264 @ 0x7fba5f822000] using cpu capabilities: MMX2 SSE2Fast SSSE3
>> SSE4.2
>> [libx264 @ 0x7fba5f822000] profile High, level 3.0, 4:2:0, 8-bit
>> [libx264 @ 0x7fba5f822000] 264 - core 163 r3060 5db6aa6 - H.264/MPEG-4 AVC
>> codec - Copyleft 2003-2021 - http://www.videolan.org/x264.html - options:
>> cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1
>> psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1
>> cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=15
>> lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0
>> bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0
>> direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=23 scenecut=40
>> intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0
>> qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
>> [mov @ 0x7fba5f831400] Drop frame is only allowed with multiples of
>> 30000/1001 FPS
>> Output #0, mov, to '/Volumes/Drive5/videopress_testing/pullup_test1.mov':
>>  Metadata:
>>    major_brand     : qt
>>    minor_version   : 537199360
>>    compatible_brands: qt
>>    encoder         : Lavf58.76.100
>>  Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuv420p(tv,
>> smpte170m/smpte170m/bt709, top coded first (swapped)), 720x480 [SAR 10:11
>> DAR 15:11], q=2-31, 23.98 fps, 24k tbn (default)
>>    Metadata:
>>      creation_time   : 2022-03-08T16:50:01.000000Z
>>      handler_name    : Apple Video Media Handler
>>      vendor_id       : appl
>>      timecode        : 00:00:00;00
>>      encoder         : Lavc58.134.100 libx264
>>    Side data:
>>      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
>> frame=    2 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=1
>> droframe=  323 fps=0.0 q=-1.0 Lsize=      82kB time=00:00:13.34 bitrate=
>> 50.2kbits/s dup=3 drop=0 speed=26.7x
>> video:78kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
>> muxing overhead: 5.091292%
>> [libx264 @ 0x7fba5f822000] frame I:2     Avg QP:13.12  size:   698
>> [libx264 @ 0x7fba5f822000] frame P:212   Avg QP:21.95  size:   239
>> [libx264 @ 0x7fba5f822000] frame B:109   Avg QP:22.99  size:   248
>> [libx264 @ 0x7fba5f822000] consecutive B-frames: 39.9% 41.5% 11.1%  7.4%
>> [libx264 @ 0x7fba5f822000] mb I  I16..4: 99.3%  0.0%  0.7%
>> [libx264 @ 0x7fba5f822000] mb P  I16..4:  1.4%  0.6%  0.2%  P16..4:  0.7%
>> 0.1%  0.0%  0.0%  0.0%    skip:96.9%
>> [libx264 @ 0x7fba5f822000] mb B  I16..4:  0.6%  0.0%  0.0%  B16..8:  1.6%
>> 0.2%  0.0%  direct: 0.4%  skip:97.2%  L0:50.7% L1:47.0% BI: 2.3%
>> [libx264 @ 0x7fba5f822000] 8x8 transform intra:17.9% inter:49.4%
>> [libx264 @ 0x7fba5f822000] coded y,uvDC,uvAC intra: 2.3% 19.4% 16.8% inter:
>> 0.1% 0.5% 0.5%
>> [libx264 @ 0x7fba5f822000] i16 v,h,dc,p: 69% 29%  1%  0%
>> [libx264 @ 0x7fba5f822000] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 15% 69%  0%
>> 0%  0%  0%  0%  0%
>> [libx264 @ 0x7fba5f822000] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 34% 27% 38%  0%
>> 0%  0%  0%  0%  0%
>> [libx264 @ 0x7fba5f822000] i8c dc,h,v,p: 45% 35% 18%  1%
>> [libx264 @ 0x7fba5f822000] Weighted P-Frames: Y:0.0% UV:0.0%
>> [libx264 @ 0x7fba5f822000] ref P L0: 52.8%  1.3% 28.8% 17.1%
>> [libx264 @ 0x7fba5f822000] ref B L0: 80.9% 18.6%  0.6%
>> [libx264 @ 0x7fba5f822000] ref B L1: 98.6%  1.4%
>> [libx264 @ 0x7fba5f822000] kb/s:46.94
>> 
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