I wanted to execute zoom-and-pan out over a few seconds by parametrizing the
width and height of the crop filter via sendcmd (the result of which would then
be handed to a scale filter), and when I try to do this, I get errors that I
don't understand.
When I use:
sendcmd=c='0-1 crop w 1146+t*(1920-1146), crop h 1080'
I get:
Error when evaluating the expression '1146+t*(1920-1146)'
When I use
sendcmd=c='0-1 crop w 1146+T*(1920-1146), crop h 1080'
I get:
Unknown function in 'T*(1920-1146)'
Error when evaluating the expression '1146+T*(1920-1146)'
Neither of these seem to make sense to me. The crop filter docs indicate it
takes the parameter 't', and the general eval api docs refer to 'T'. I'm not
sure which (or both?) applies, but both fail in odd ways.
Same problem with a simpler exmpression like '1146+T'.
What am I doing wrong? Console output below.
I ultimately managed to get the zoompad filter to work for me, but it doesn't
really seem designed to work well with video (rather than a still). I ended up
using
zoompan=z=if(eq(pzoom\,1)\,1.8\,max(pzoom-0.0025\,1.01)):x='iw/2-(iw/zoom/2)+60':y='ih/2-(ih/zoom/2)-120':d=1:fps=30,
where if I didn't specify the fps rate, it desynced my audio and video, and the
expression necessary to make it work, depending on pzoom, and specifying the
zoom steps...just felt fragile. (On the other hand, presumably it's more
performant than a crop filter followed by a scale filer).
Thanks you.
--
jh...@alum.mit.edu
John Hawkinson
$ sh -x diag.sh
+ ffplay -i v -vf '
sendcmd=c='\''0-1 crop w 1146+T, crop h 1080'\'',
crop=
1146:644:
456-clip(t\,0\,1)*456:
73-clip(t\,0\,1)*73'
ffplay version 4.2.2 Copyright (c) 2003-2019 the FFmpeg developers
built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.2 --enable-shared
--enable-pthreads --enable-version3 --enable-avresample --cc=clang
--host-cflags='-I/Library/Java/JavaVirtualMachines/jdk1.8.0_74.jdk/Contents/Home/include
-I/Library/Java/JavaVirtualMachines/jdk1.8.0_74.jdk/Contents/Home/include/darwin'
--host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom
--enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband
--enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvidstab
--enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265
--enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype
--enable-frei0r --enable-libass --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp
--enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack
--disable-indev=jack --enable-libzvbi
libavutil 56. 31.100 / 56. 31.100
libavcodec 58. 54.100 / 58. 54.100
libavformat 58. 29.100 / 58. 29.100
libavdevice 58. 8.100 / 58. 8.100
libavfilter 7. 57.100 / 7. 57.100
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 5.100 / 5. 5.100
libswresample 3. 5.100 / 3. 5.100
libpostproc 55. 5.100 / 55. 5.100
Input #0, matroska,webm, from 'v':
Metadata:
COMPATIBLE_BRANDS: iso6avc1mp41
MAJOR_BRAND : dash
MINOR_VERSION : 0
ENCODER : Lavf58.29.100
Duration: 00:04:30.30, start: -0.007000, bitrate: 2977 kb/s
Stream #0:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080
[SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc (default)
Metadata:
HANDLER_NAME : ISO Media file produced by Google Inc.
DURATION : 00:04:30.270000000
Stream #0:1(eng): Audio: opus, 48000 Hz, stereo, fltp (default)
Metadata:
DURATION : 00:04:30.301000000
[Parsed_crop_1 @ 0x7f7f8d7955c0] [Eval @ 0x7000072cedb0] Undefined constant or
missing '(' in 'T'
Error when evaluating the expression '1146+T'
[Parsed_crop_1 @ 0x7f7f8d7955c0] [Eval @ 0x7000072cedb0] Undefined constant or
missing '(' in 'T'
Error when evaluating the expression '1146+T'
Switch subtitle stream from #-1 to #-1 vq= 162KB sq= 0B f=0/0
2.09 A-V: -0.030 fd= 5 aq= 20KB vq= 143KB sq= 0B f=0/0
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