david furst
Reputation: 359
ffmpeg - script to extract 1st frame of each second with deinterlacing
i'm trying to write a shell script to analyse some videos by using the first frame of each second of video as a basis. i'm using ffmpeg to extract the frames. i thought i'd hit gold when this thread came up in my searches, but it doesn't handle the deinterlacing.
i'm using a time-based approach that works well for various formats as long as the video is progressive. it doesn't work so well for interlaced video (only the first field is output in that case, creating a half-height image). i've tried various combinations of deinterlacing (yadif/bwdif) with select but the filter chains i create either cause errors or still return a half-sized image.
here is my call w/a filter that works correctly for progressive video source :
ffmpeg -i $infile -vf "select='if(eq(n\,0),1,floor(t)-floor(prev_selected_t))" -vsync 0 $outfile
the following still return only half-height images for interlaced source :
... -vf "bwdif=0,select='if(eq(n\,0),1,floor(t)-floor(prev_selected_t))'"
... -vf "bwdif=0,select='between(mod(n\,$ips)\,1\,2)'" -- $ips is images per second
... -vf "select='between(mod(n\,$ips)\,1\,2)',bwdif=0"
i've also tried various permutations of the above w/explicit frame reference (-r, -vframes, ...), still no joy.
can someone help me with the syntax ?
--EDIT--
here is the complete output of running the command with the first filter :
ffmpeg version N-104925-gfe95731e3d-g68457c1e85+3 Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 11.2.0 (Rev5, Built by MSYS2 project)
configuration: --pkg-config=pkgconf --cc='ccache gcc' --cxx='ccache g++' --ld='ccache g++' --disable-autodetect --enable-amf --enable-bzlib --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-iconv --enable-lzma --enable-nvenc --enable-zlib --enable-sdl2 --enable-ffnvcodec --enable-nvdec --enable-cuda-llvm --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libdav1d --enable-libaom --disable-debug --enable-libfdk-aac --enable-fontconfig --enable-libass --enable-libbluray --enable-libfreetype --enable-libmfx --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libwebp --enable-libxml2 --enable-libzimg --enable-libshine --enable-gpl --enable-avisynth --enable-libxvid --enable-libopenmpt --enable-version3 --enable-librav1e --enable-libsrt --enable-libgsm --enable-libvmaf --enable-libsvtav1 --enable-chromaprint --enable-decklink --enable-frei0r --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfribidi --enable-libgme --enable-libilbc --enable-libsvthevc --enable-libsvtvp9 --enable-libkvazaar --enable-libmodplug --enable-librist --enable-librtmp --enable-librubberband --enable-libtesseract --enable-libxavs --enable-libzmq --enable-libzvbi --enable-openal --enable-libcodec2 --enable-ladspa --enable-libglslang --enable-vulkan --enable-libdavs2 --enable-libxavs2 --enable-libuavs3d --enable-opencl --enable-opengl --enable-libopenh264 --enable-openssl --extra-cflags=-DLIBTWOLAME_STATIC --extra-libs=-lstdc++ --extra-cflags=-DCACA_STATIC --extra-cflags=-DMODPLUG_STATIC --extra-cflags=-DCHROMAPRINT_NODLL --extra-libs=-lstdc++ --extra-cflags=-DZMQ_STATIC --extra-libs=-lpsapi --extra-cflags=-DLIBXML_STATIC --extra-libs=-liconv --disable-w32threads --extra-cflags=-DKVZ_STATIC_LIB --enable-nonfree --extra-cflags=-DAL_LIBTYPE_STATIC --extra-cflags='-IC:/ffab/local64/include' --extra-cflags='-IC:/ffab/local64/include/AL'
libavutil 57. 11.100 / 57. 11.100
libavcodec 59. 14.100 / 59. 14.100
libavformat 59. 10.100 / 59. 10.100
libavdevice 59. 0.101 / 59. 0.101
libavfilter 8. 20.100 / 8. 20.100
libswscale 6. 1.101 / 6. 1.101
libswresample 4. 0.100 / 4. 0.100
libpostproc 56. 0.100 / 56. 0.100
Passing a number to -vsync is deprecated, use a string argument as described in the manual.
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, mxf, from 'mire-720-576-16-9.mxf':
Metadata:
operational_pattern_ul: 060e2b34.04010101.0d010201.01010900
product_uid : adab4424-2f25-4dc7-92ff-29bd000c0002
uid : adab4424-2f25-4dc7-92ff-29bd000c0000
generation_uid : adab4424-2f25-4dc7-92ff-29bd000c0001
company_name : FFmpeg
product_name : OP1a Muxer
product_version_num: 58.38.100.0.0
product_version : 58.38.100
toolkit_version_num: 58.38.100.0.0
material_package_umid: 0x060A2B340101010501010D001375063852947134C97506380052947134C97500
timecode : 00:00:00:00
Duration: 00:02:00.00, start: 0.000000, bitrate: 55987 kb/s
Stream #0:0: Video: jpeg2000, yuv422p10le(top first), 720x288, lossless, SAR 32:45 DAR 16:9, 50 tbr, 50 tbn
Metadata:
file_package_umid: 0x060A2B340101010501010D001375063852947134C97506380052947134C97501
track_name : Picture
Stream #0:1: Audio: pcm_s24le, 48000 Hz, stereo, s32 (24 bit), 2304 kb/s
Metadata:
file_package_umid: 0x060A2B340101010501010D001375063852947134C97506380052947134C97501
track_name : Sound
Stream mapping:
Stream #0:0 -> #0:0 (jpeg2000 (native) -> png (native))
Press [q] to stop, [?] for help
Output #0, image2, to 'testout%04d.png':
Metadata:
operational_pattern_ul: 060e2b34.04010101.0d010201.01010900
product_uid : adab4424-2f25-4dc7-92ff-29bd000c0002
uid : adab4424-2f25-4dc7-92ff-29bd000c0000
generation_uid : adab4424-2f25-4dc7-92ff-29bd000c0001
timecode : 00:00:00:00
material_package_umid: 0x060A2B340101010501010D001375063852947134C97506380052947134C97500
product_version_num: 58.38.100.0.0
toolkit_version_num: 58.38.100.0.0
encoder : Lavf59.10.100
Stream #0:0: Video: png, rgb48be(pc, gbr/unknown/unknown, progressive), 720x288 [SAR 32:45 DAR 16:9], q=2-31, 200 kb/s, 50 fps, 50 tbn
Metadata:
file_package_umid: 0x060A2B340101010501010D001375063852947134C97506380052947134C97501
track_name : Picture
encoder : Lavc59.14.100 png
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frame= 120 fps=1.7 q=-0.0 size=N/A time=00:01:58.02 bitrate=N/A speed=1.65x
frame= 120 fps=1.7 q=-0.0 size=N/A time=00:01:58.02 bitrate=N/A speed=1.63x
frame= 120 fps=1.7 q=-0.0 Lsize=N/A time=00:01:59.02 bitrate=N/A speed=1.64x
video:43029kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Upvotes: 0
Views: 382
Answers (1)
Gyan
Reputation: 93369
Your input is detected as interlaced but with half-height (288) and double the framerate (50). This may be due to missing or unrecognized boundary markers in the JPEG2000 packets. I assume this is meant to be PAL --> 720x576@25i.
Try using the tinterlace filter first to interleave the input "frames" to double-height and half fps, and then continue the original sequence of filters.
"tinterlace=mode=merge,bwdif=0,select='if(eq(n\,0),1,floor(t)-floor(prev_selected_t))'"
Upvotes: 1
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