[FFmpeg-trac] #3253(avfilter:new): drawtext filter: problems with text expansions

[FFmpeg]

#3253: drawtext filter: problems with text expansions
----------------------------------+---------------------------------------
             Reporter:  Krieger   |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avfilter  |                  Version:  unspecified
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
----------------------------------+---------------------------------------
 Summary of the bug:

 Text expansion seem to be not working.

 How to reproduce:
 {{{
 $ ffmpeg -re -f lavfi -i testsrc -filter:v
 'drawtext=text=%{expr:t}:fontfile=/usr/share/fonts/corefonts/verdana.ttf:fontsize=50:fontcolor=red'
 -y ~/netdisk/tmp/tmp.ts
 ffmpeg version N-59414-g8a0d446 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Dec 29 2013 16:17:21 with gcc 4.6.3 (Gentoo 4.6.3 p1.13,
 pie-0.5.2)
   configuration: --enable-gpl --enable-libx264 --enable-encoder=libx264
 --disable-stripping --enable-debug --extra-cflags='-O0 -g -ggdb' --enable-
 libopus --enable-libvpx --enable-x11grab --enable-libfreetype --enable-
 filter=drawtext
   libavutil      52. 59.100 / 52. 59.100
   libavcodec     55. 47.100 / 55. 47.100
   libavformat    55. 22.100 / 55. 22.100
   libavdevice    55.  5.102 / 55.  5.102
   libavfilter     4.  0.103 /  4.  0.103
   libswscale      2.  5.101 /  2.  5.101
   libswresample   0. 17.104 /  0. 17.104
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, lavfi, from 'testsrc':
   Duration: N/A, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 320x240
 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
 Output #0, mpegts, to '/home/krieger/netdisk/tmp/tmp.ts':
   Metadata:
     encoder         : Lavf55.22.100
     Stream #0:0: Video: mpeg2video, yuv420p, 320x240 [SAR 1:1 DAR 4:3],
 q=2-31, 200 kb/s, 90k tbn, 25 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (rawvideo -> mpeg2video)
 Press [q] to stop, [?] for help
 frame=   35 fps= 26 q=2.0 Lsize=      75kB time=00:00:01.36 bitrate=
 451.2kbits/s
 video:65kB audio:0kB subtitle:0 global headers:0kB muxing overhead
 15.131411%
 Received signal 2: terminating.
 }}}

 The desired effect is printing of timestamp in seconds (see t variable in
 drawtext doc section). This way we have printed text "t}", which is
 nonsense.

 If we swap the order of filter params "text" and "fontfile", it fails to
 start. Tried both escaping and not escaping semicolon in expansion block.

 {{{
  $ ffmpeg -re -f lavfi -i testsrc -filter:v
 'drawtext=fontfile=/usr/share/fonts/corefonts/verdana.ttf:text=%{e:
 t}:fontsize=50:fontcolor=red' -y ~/netdisk/tmp/tmp.ts
 ffmpeg version N-59414-g8a0d446 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Dec 29 2013 16:17:21 with gcc 4.6.3 (Gentoo 4.6.3 p1.13,
 pie-0.5.2)
   configuration: --enable-gpl --enable-libx264 --enable-encoder=libx264
 --disable-stripping --enable-debug --extra-cflags='-O0 -g -ggdb' --enable-
 libopus --enable-libvpx --enable-x11grab --enable-libfreetype --enable-
 filter=drawtext
   libavutil      52. 59.100 / 52. 59.100
   libavcodec     55. 47.100 / 55. 47.100
   libavformat    55. 22.100 / 55. 22.100
   libavdevice    55.  5.102 / 55.  5.102
   libavfilter     4.  0.103 /  4.  0.103
   libswscale      2.  5.101 /  2.  5.101
   libswresample   0. 17.104 /  0. 17.104
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, lavfi, from 'testsrc':
   Duration: N/A, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 320x240
 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
 [Parsed_drawtext_0 @ 0x24cd8a0] Could not load font "t}": cannot open
 resource
 [AVFilterGraph @ 0x24d47e0] Error initializing filter 'drawtext' with args
 'fontfile=/usr/share/fonts/corefonts/verdana.ttf:text=%{e:
 t}:fontsize=50:fontcolor=red'
 Error opening filters!
 [ERR]
 16:56:12krieger at zver /usr/local/src/ffmpeg
  $ ffmpeg -re -f lavfi -i testsrc -filter:v
 'drawtext=fontfile=/usr/share/fonts/corefonts/verdana.ttf:text=%{e\:
 t}:fontsize=50:fontcolor=red' -y ~/netdisk/tmp/tmp.ts
 ffmpeg version N-59414-g8a0d446 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Dec 29 2013 16:17:21 with gcc 4.6.3 (Gentoo 4.6.3 p1.13,
 pie-0.5.2)
   configuration: --enable-gpl --enable-libx264 --enable-encoder=libx264
 --disable-stripping --enable-debug --extra-cflags='-O0 -g -ggdb' --enable-
 libopus --enable-libvpx --enable-x11grab --enable-libfreetype --enable-
 filter=drawtext
   libavutil      52. 59.100 / 52. 59.100
   libavcodec     55. 47.100 / 55. 47.100
   libavformat    55. 22.100 / 55. 22.100
   libavdevice    55.  5.102 / 55.  5.102
   libavfilter     4.  0.103 /  4.  0.103
   libswscale      2.  5.101 /  2.  5.101
   libswresample   0. 17.104 /  0. 17.104
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, lavfi, from 'testsrc':
   Duration: N/A, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 320x240
 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
 [Parsed_drawtext_0 @ 0x1dc28a0] Could not load font "t}": cannot open
 resource
 [AVFilterGraph @ 0x1dc97e0] Error initializing filter 'drawtext' with args
 'fontfile=/usr/share/fonts/corefonts/verdana.ttf:text=%{e:
 t}:fontsize=50:fontcolor=red'
 Error opening filters!
 [ERR]
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3253>
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