[FFmpeg-user] filterstats broadcast legal report

[Carles Vila]

Hi all,
I'd like to set up a command to find out if a video is broadcast legal.
I've tried to understand how signalstats works but I need some help.
I tried the examples in the ffmpeg filter documentation, like the one
pasted below, but I'd like to customize it to my needs.

Ideally It would output a list of frames that do not meet broadcast specs.

FWIW, the video is Quicktime wrapped DNxHD.
Thank you!


$ ffprobe -f lavfi movie=INPUTFILE.mov,signalstats="stat=brng" -show_frames
ffprobe version 2.4.2 Copyright (c) 2007-2014 the FFmpeg developers
  built on Oct 28 2014 17:39:46 with Apple LLVM version 5.1
(clang-503.0.40) (based on LLVM 3.4svn)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/2.4.2 --enable-shared
--enable-pthreads --enable-gpl --enable-version3 --enable-nonfree
--enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang
--host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac
--enable-libmp3lame --enable-libxvid --enable-libfreetype
--enable-libtheora --enable-libvorbis --enable-libvpx --enable-librtmp
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-aacenc
--enable-libass --enable-ffplay --enable-libspeex --enable-libschroedinger
--enable-libfdk-aac --enable-libopus --enable-frei0r --enable-libopenjpeg
--extra-cflags='-I/usr/local/Cellar/openjpeg/1.5.1_1/include/openjpeg-1.5 '
  libavutil      54.  7.100 / 54.  7.100
  libavcodec     56.  1.100 / 56.  1.100
  libavformat    56.  4.101 / 56.  4.101
  libavdevice    56.  0.100 / 56.  0.100
  libavfilter     5.  1.100 /  5.  1.100
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  0.100 /  3.  0.100
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  0.100 / 53.  0.100
Input #0, lavfi, from 'movie=INPUTFILE.mov,signalstats=stat=brng':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: rawvideo (Y42B / 0x42323459), yuv422p, 1920x1080
[SAR 1:1 DAR 16:9], 25 tbr, 25 tbn, 25 tbc
[FRAME]
media_type=video
key_frame=1
pkt_pts=0
pkt_pts_time=0.000000
pkt_dts=0
pkt_dts_time=0.000000
best_effort_timestamp=0
best_effort_timestamp_time=0.000000
pkt_duration=1
pkt_duration_time=0.040000
pkt_pos=577024
pkt_size=4147200
width=1920
height=1080
pix_fmt=yuv422p
sample_aspect_ratio=1:1
pict_type=I
coded_picture_number=0
display_picture_number=0
interlaced_frame=0
top_field_first=0
repeat_pict=0
TAG:lavfi.signalstats.YMIN=12
TAG:lavfi.signalstats.YLOW=58
TAG:lavfi.signalstats.YAVG=74.9742
TAG:lavfi.signalstats.YHIGH=84
TAG:lavfi.signalstats.YMAX=241
TAG:lavfi.signalstats.UMIN=36
TAG:lavfi.signalstats.ULOW=145
TAG:lavfi.signalstats.UAVG=150.074
TAG:lavfi.signalstats.UHIGH=158
TAG:lavfi.signalstats.UMAX=166
TAG:lavfi.signalstats.VMIN=47
TAG:lavfi.signalstats.VLOW=98
TAG:lavfi.signalstats.VAVG=106.101
TAG:lavfi.signalstats.VHIGH=112
TAG:lavfi.signalstats.VMAX=174
TAG:lavfi.signalstats.SATMIN=0
TAG:lavfi.signalstats.SATLOW=24
TAG:lavfi.signalstats.SATAVG=32.6906
TAG:lavfi.signalstats.SATHIGH=42
TAG:lavfi.signalstats.SATMAX=99
TAG:lavfi.signalstats.HUEMED=313
TAG:lavfi.signalstats.HUEAVG=308.107
TAG:lavfi.signalstats.YDIF=0
TAG:lavfi.signalstats.UDIF=0
TAG:lavfi.signalstats.VDIF=0
TAG:lavfi.signalstats.BRNG=0.00231144
[/FRAME]

etc