id	summary	reporter	owner	description	type	status	priority	component	version	resolution	keywords	cc	blockedby	blocking	reproduced	analyzed
732	Storing variables not working in expressions	jworrall		"Storing a variable does not allow it to be retrieved:

-vf ""scale = st(0\,1) * 640 : ld(0) * 480""

The first function, st(0,1), evaluates to 1, and the output file has a width of 640.
The second function, ld(0), apparently evaluates to 0, and the output retains its original height.

My understanding is that ld(0) should reload var 0 with a value of 1.

Following is a typical complete command line and full output.  Problem is not limited to one input file:

ffmpeg -i kit.mov -t 3 -c:v libx264 \
-vf ""scale = st(0\,1) * 640 : ld(0) * 480"" \
-vprofile main -preset veryslow -x264opts level=3.1:ref=8 -c:a libvo_aacenc -y output.m4v

ffmpeg version 0.8.7.git-337ce55, Copyright (c) 2000-2011 the FFmpeg developers
  built on Dec 10 2011 09:35:29 with clang 3.0 (tags/Apple/clang-211.12)
  configuration: --prefix=/Volumes/Ramdisk/sw --cc=clang --enable-gpl --enable-version3 --arch=x86_64 --enable-hardcoded-tables --disable-indevs --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libvo-aacenc --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libx264 --enable-libvorbis --enable-libtheora --enable-libspeex --disable-ffserver
  libavutil    51. 32. 0 / 51. 32. 0
  libavcodec   53. 42. 0 / 53. 42. 0
  libavformat  53. 24. 0 / 53. 24. 0
  libavdevice  53.  4. 0 / 53.  4. 0
  libavfilter   2. 52. 0 /  2. 52. 0
  libswscale    2.  1. 0 /  2.  1. 0
  libpostproc  51.  2. 0 / 51.  2. 0

Seems stream 0 codec frame rate differs from container frame rate: 1200.00 (1200/1) -> 29.97 (30000/1001)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'kit.mov':
  Metadata:
    major_brand     : qt  
    minor_version   : 537199360
    compatible_brands: qt  
    creation_time   : 2011-05-08 00:51:03
  Duration: 00:01:21.61, start: 0.000000, bitrate: 10723 kb/s
    Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 1280x720, 10655 kb/s, 29.81 fps, 29.97 tbr, 600 tbn, 1200 tbc
    Metadata:
      creation_time   : 2011-05-08 00:51:03
      handler_name    : 
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, s16, 63 kb/s
    Metadata:
      creation_time   : 2011-05-08 00:51:03
      handler_name    : ?Apple Alias Data Handler
[buffer @ 0x7fb642c165a0] w:1280 h:720 pixfmt:yuv420p tb:1/1000000 sar:0/1 sws_param:
[scale @ 0x7fb642c1fdc0] w:1280 h:720 fmt:yuv420p -> w:640 h:720 fmt:yuv420p flags:0x4
[libx264 @ 0x7fb643031800] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
[libx264 @ 0x7fb643031800] profile Main, level 3.1
[libx264 @ 0x7fb643031800] 264 - core 120 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - http://www.videolan.org/x264.html - options: cabac=1 ref=8 deblock=1:0:0 analyse=0x1:0x131 me=umh subme=10 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=8 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=60 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, ipod, to 'output.m4v':
  Metadata:
    major_brand     : qt  
    minor_version   : 537199360
    compatible_brands: qt  
    creation_time   : 2011-05-08 00:51:03
    encoder         : Lavf53.24.0
    Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p, 640x720, q=-1--1, 30k tbn, 29.97 tbc
    Metadata:
      creation_time   : 2011-05-08 00:51:03
      handler_name    : 
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, s16, 128 kb/s
    Metadata:
      creation_time   : 2011-05-08 00:51:03
      handler_name    : ?Apple Alias Data Handler
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> libx264)
  Stream #0:1 -> #0:1 (aac -> libvo_aacenc)
Press [q] to stop, [?] for help
frame=   90 fps= 12 q=-1.0 Lsize=     206kB time=00:00:02.93 bitrate= 574.6kbits/s    
video:154kB audio:47kB global headers:0kB muxing overhead 2.113484%
[libx264 @ 0x7fb643031800] frame I:1     Avg QP:24.70  size: 14288
[libx264 @ 0x7fb643031800] frame P:17    Avg QP:25.77  size:  4099
[libx264 @ 0x7fb643031800] frame B:72    Avg QP:30.15  size:  1021
[libx264 @ 0x7fb643031800] consecutive B-frames:  1.1%  0.0%  0.0% 13.3% 44.4% 33.3%  7.8%  0.0%  0.0%
[libx264 @ 0x7fb643031800] mb I  I16..4: 51.5%  0.0% 48.5%
[libx264 @ 0x7fb643031800] mb P  I16..4:  1.7%  0.0%  1.3%  P16..4: 41.2%  7.2%  9.9%  0.1%  0.0%    skip:38.6%
[libx264 @ 0x7fb643031800] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8: 43.1%  1.8%  0.2%  direct: 0.3%  skip:54.5%  L0:43.0% L1:55.7% BI: 1.3%
[libx264 @ 0x7fb643031800] direct mvs  spatial:94.4% temporal:5.6%
[libx264 @ 0x7fb643031800] coded y,uvDC,uvAC intra: 43.6% 34.0% 12.2% inter: 1.6% 2.1% 0.0%
[libx264 @ 0x7fb643031800] i16 v,h,dc,p: 50%  5%  6% 39%
[libx264 @ 0x7fb643031800] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 30%  2% 15%  9% 14% 10%  8%  7%  5%
[libx264 @ 0x7fb643031800] i8c dc,h,v,p: 44% 21% 27%  8%
[libx264 @ 0x7fb643031800] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x7fb643031800] ref P L0: 50.3% 14.3% 17.2%  5.4%  4.5%  3.1%  3.4%  1.8%
[libx264 @ 0x7fb643031800] ref B L0: 82.3% 10.1%  4.4%  1.7%  0.8%  0.5%  0.2%
[libx264 @ 0x7fb643031800] ref B L1: 89.7% 10.3%
[libx264 @ 0x7fb643031800] kb/s:419.56
localhost:Desktop jim$ 
"	enhancement	closed	normal	avutil	unspecified	wontfix	expression evaluation scale	coniophora@…			0	0