First, I realize I'm using an older version of ffmpeg (6.1.2). If this
has been fixed/changed in a newer version or if this is the intended
behavior that's fine, I'd just like to know which it is.
I'm using ffplay and the drawtext filter to display the time and frame
number overlayed on a video using the following command:
ffplay -i video.mkv -vf "drawtext=text='%{pts\:hms} (%{pts}) FrameNum=%{frame_num}
FrameType=%{pict_type}':start_number=1:fontfile=/usr/share/fonts/dejavu/DejaVuSans.ttf:fontsize=60:fontcolor=white:box=1:boxcolor=black"
This works fine in that it displays the info. The problem is with
frame_num. If I use the ffplay seek forward or backward commands or a
right mouse click to seek to a percentage of the video, then the frame_num
is reset to 1 (ie start_number) and then starts counting from that seek
point. Is this how frame_num is supposed to work or is (maybe was) this a
bug?
If this is the intended behavior for the frame_num keyword, then is there
an alternate keyword that will always the display the absolute frame
number rather than what appears to be a frame number relative to the
current seek point?
Thanks.
Complete output of ffplay command
-------------------------------------------
$ ffplay -i video.mkv -vf "drawtext=text='%{pts\:hms} (%{pts}) FrameNum=%{frame_num}
FrameType=%{pict_type}':start_number=1:fontfile=/usr/share/fonts/dejavu/DejaVuSans.ttf:fontsize=60:fontcolor=white:box=1:boxcolor=black"
ffplay version 6.1.2 Copyright (c) 2003-2024 the FFmpeg developers
built with gcc 14 (GCC)
configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg
--docdir=/usr/share/doc/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64
--mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -flto=auto
-ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall
-Wno-complain-wrong-lang -Werror=format-security
-Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -march=x86-64 -mtune=generic
-fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection
-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer'
--extra-ldflags='-Wl,-z,relro -Wl,--as-needed -Wl,-z,pack-relative-relocs
-Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -Wl,--build-id=sha1 '
--extra-cflags=' -I/usr/include/rav1e' --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libvo-amrwben
c --enable-version3 --enable-bzlib --enable-chromaprint --disable-crystalhd --enable-fontconfig --enable-frei0r --enable-gcrypt --enable-gnutls --enable-ladspa --enable-lcms2 --enable-libaom --enable-libdav1d --enable-libass --enable-libbluray --enable-libbs2b --enable-libcodec2 --enable-libcdio --enable-libdrm --enable-libjack --enable-libjxl --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libharfbuzz --enable-libilbc --enable-libmp3lame --enable-libmysofa --enable-nvenc --enable-openal --enable-opencl --enable-opengl --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-libplacebo --enable-librsvg --enable-librav1e --enable-librubberband --enable-libsmbclient --enable-version3 --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libv4l2 --enable-libvidstab --enable-libvmaf
--enable-version3 --enable-vapoursynth --enable-libvpx --enable-vulkan --enable-libshaderc --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libxml2 --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-avfilter --enable-libmodplug --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-lto --enable-libvpl --enable-runtime-cpudetect
libavutil 58. 29.100 / 58. 29.100
libavcodec 60. 31.102 / 60. 31.102
libavformat 60. 16.100 / 60. 16.100
libavdevice 60. 3.100 / 60. 3.100
libavfilter 9. 12.100 / 9. 12.100
libswscale 7. 5.100 / 7. 5.100
libswresample 4. 12.100 / 4. 12.100
libpostproc 57. 3.100 / 57. 3.100
Input #0, matroska,webm, from 'video.mkv':
Metadata:
ENCODER : Lavf60.16.100
Duration: 02:25:29.71, start: 0.000000, bitrate: 5116 kb/s
Stream #0:0: Video: vp8, yuv420p(tv, bt709, progressive), 1920x1080, SAR 1:1
DAR 16:9, 30 fps, 30 tbr, 1k tbn
Metadata:
DURATION : 02:25:29.700000000
Stream #0:1: Audio: vorbis, 48000 Hz, stereo, fltp
Metadata:
DURATION : 02:25:29.712000000
3.17 A-V: -0.015 fd= 0 aq= 15KB vq= 683KB sq= 0B f=0/0
^C
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