Re: [FFmpeg-user] filterstats broadcast legal report
On 12 February 2015 at 02:17, Dave Rice d...@dericed.com wrote: Hi Carles, On Feb 11, 2015, at 1:45 PM, Carles Vila cvi...@gmail.com wrote: 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 libavformat56. 4.101 / 56. 4.101 libavdevice56. 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 libpostproc53. 0.100 / 53. 0.100 Input #0, lavfi, from 'movie=INPUTFILE.mov,signalstats=stat=brng': Duration: N/A, start: 0.00, 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=0.00 pkt_dts=0 pkt_dts_time=0.00 best_effort_timestamp=0 best_effort_timestamp_time=0.00 pkt_duration=1 pkt_duration_time=0.04 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] This means that 0.00231144% of the frame is outside of broadcast range (Y within 16-235 and U/V within 16-240) which in your file is about 4,793 pixels. I vaguely remember someone referring a broadcast standards document which referred to broadcast legal not considering 100% of pixels to be within that range, but considered broadcast legal to mean somewhat less than 100% of the pixels had to be in the stated ranges. Unfortunately I can't remember what amount of outliers was tolerated or what the spec was. The output of ffprobe -f lavfi movie=INPUTFILE.mov,signalstats=stat=brng -show_entries frame_tags=lavfi.signalstats.BRNG -of flat may be easier to parse in your scenario since the output will include the frame numbers, like frames.frame.567.tags.lavfi_signalstats_BRNG=0 frames.frame.568.tags.lavfi_signalstats_BRNG=0 frames.frame.569.tags.lavfi_signalstats_BRNG=0 then you would need to grep out the lines where BRNG exceed some defined threshold. Hope this helps. Dave Rice ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user Hi Dave, thanks so much for the explanation and the command. I look forward to test it out. I found this document: http://www.bbc.co.uk/guidelines/dq/pdf/tv/TechnicalDeliveryStandardsBBCv3.pdf where it states: 2.3.2 Tolerance of out of gamut signals In practice it is difficult to avoid generating signals slightly
[FFmpeg-user] filterstats broadcast legal report
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 libavformat56. 4.101 / 56. 4.101 libavdevice56. 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 libpostproc53. 0.100 / 53. 0.100 Input #0, lavfi, from 'movie=INPUTFILE.mov,signalstats=stat=brng': Duration: N/A, start: 0.00, 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=0.00 pkt_dts=0 pkt_dts_time=0.00 best_effort_timestamp=0 best_effort_timestamp_time=0.00 pkt_duration=1 pkt_duration_time=0.04 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 ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] filterstats broadcast legal report
Hi Carles, On Feb 11, 2015, at 1:45 PM, Carles Vila cvi...@gmail.com wrote: 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 libavformat56. 4.101 / 56. 4.101 libavdevice56. 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 libpostproc53. 0.100 / 53. 0.100 Input #0, lavfi, from 'movie=INPUTFILE.mov,signalstats=stat=brng': Duration: N/A, start: 0.00, 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=0.00 pkt_dts=0 pkt_dts_time=0.00 best_effort_timestamp=0 best_effort_timestamp_time=0.00 pkt_duration=1 pkt_duration_time=0.04 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] This means that 0.00231144% of the frame is outside of broadcast range (Y within 16-235 and U/V within 16-240) which in your file is about 4,793 pixels. I vaguely remember someone referring a broadcast standards document which referred to broadcast legal not considering 100% of pixels to be within that range, but considered broadcast legal to mean somewhat less than 100% of the pixels had to be in the stated ranges. Unfortunately I can't remember what amount of outliers was tolerated or what the spec was. The output of ffprobe -f lavfi movie=INPUTFILE.mov,signalstats=stat=brng -show_entries frame_tags=lavfi.signalstats.BRNG -of flat may be easier to parse in your scenario since the output will include the frame numbers, like frames.frame.567.tags.lavfi_signalstats_BRNG=0 frames.frame.568.tags.lavfi_signalstats_BRNG=0 frames.frame.569.tags.lavfi_signalstats_BRNG=0 then you would need to grep out the lines where BRNG exceed some defined threshold. Hope this helps. Dave Rice ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
