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• Error converting .flv to .avi with ffmpeg

  5 juillet 2012, par user1504396

  When i try the 2d code, with a 5 minutes 7 second video, I get a 28 minutes 29 seconds video, What did I do wrong ?

  Here is the ffmpeg output :

  [Me@Hewlett-Packard Downloads]$ ffmpeg -i "0042473.flv" -s 400x240 -aspect 2:1 -r 20 -vcodec mjpeg -qscale 1 -acodec adpcm_ima_wav -ac 2 "VID_0001.AVI"
  
  ffmpeg version 0.8.10, Copyright © 2000-2011 the FFmpeg developers
  
  built on Feb 29 2012 16:30:44 with gcc 4.6.2 20111027 (Red Hat 4.6.2-1)
  
  configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic' --enable-bzlib --enable-libcelt --enable-libdc1394 --enable-libdirac --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab --enable-avfilter --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
  
  libavutil 51. 9. 1 / 51. 9. 1
  
  libavcodec 53. 8. 0 / 53. 8. 0
  
  libavformat 53. 5. 0 / 53. 5. 0
  
  libavdevice 53. 1. 1 / 53. 1. 1
  
  libavfilter 2. 23. 0 / 2. 23. 0
  
  libswscale 2. 0. 0 / 2. 0. 0
  
  libpostproc 51. 2. 0 / 51. 2. 0
  
  [flv @ 0x2165600] Estimating duration from bitrate, this may be inaccurate
  
  
  
  Seems stream 0 codec frame rate differs from container frame rate: 59.94 (2997/50) -> 29.97 (30000/1001)
  
  Input #0, flv, from '0042473.flv':
  
  Metadata:
  
  minor_version : 1
  
  stereo : true
  
  videocodecid : 7
  
  audiodatarate : 62
  
  audiosamplerate : 44100
  
  audiosize : 2476815
  
  canSeekToEnd : true
  
  creation_time : 2011-05-01 18:06:43
  
  copyright :
  
  compatible_brands: isomavc1
  
  datasize : 16589374
  
  duration : 308
  
  copyright-eng :
  
  encoder : Lavf52.104.0
  
  videodatarate : 351
  
  hasAudio : true
  
  hasCuePoints : false
  
  hasKeyframes : true
  
  hasMetadata : true
  
  hasVideo : true
  
  width : 480
  
  lasttimestamp : 308
  
  audiocodecid : 10
  
  metadatacreator : flvtool++ (Facebook, Motion project, dweatherford)
  
  major_brand : isom
  
  audiosamplesize : 16
  
  totalframes : 9225
  
  framerate : 30
  
  height : 272
  
  videosize : 13863389
  
  filesize : 16587742
  
  Duration: 00:05:07.94, start: 0.000000, bitrate: 423 kb/s
  
  Stream #0.0: Video: h264 (High), yuv420p, 480x272 [PAR 1:1 DAR 30:17], 359 kb/s, 29.97 tbr, 1k tbn, 59.94 tbc
  
  Stream #0.1: Audio: aac, 44100 Hz, stereo, s16, 63 kb/s
  
  Incompatible pixel format 'yuv420p' for codec 'mjpeg', auto-selecting format 'yuvj420p'
  
  [buffer @ 0x216b180] w:480 h:272 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param:
  
  [scale @ 0x216bf40] w:480 h:272 fmt:yuv420p -> w:400 h:240 fmt:yuvj420p flags:0x4
  
  Output #0, avi, to 'VID_0001.AVI':
  
  Metadata:
  
  minor_version : 1
  
  stereo : true
  
  videocodecid : 7
  
  audiodatarate : 62
  
  audiosamplerate : 44100
  
  audiosize : 2476815
  
  canSeekToEnd : true
  
  creation_time : 2011-05-01 18:06:43
  
  ICOP :
  
  compatible_brands: isomavc1
  
  datasize : 16589374
  
  duration : 308
  
  copyright-eng :
  
  filesize : 16587742
  
  videodatarate : 351
  
  hasAudio : true
  
  hasCuePoints : false
  
  hasKeyframes : true
  
  hasMetadata : true
  
  hasVideo : true
  
  width : 480
  
  lasttimestamp : 308
  
  audiocodecid : 10
  
  metadatacreator : flvtool++ (Facebook, Motion project, dweatherford)
  
  major_brand : isom
  
  audiosamplesize : 16
  
  totalframes : 9225
  
  framerate : 30
  
  height : 272
  
  videosize : 13863389
  
  ISFT : Lavf53.5.0
  
  Stream #0.0: Video: mjpeg, yuvj420p, 400x240 [PAR 6:5 DAR 2:1], q=2-31, 200 kb/s, 20 tbn, 20 tbc
  
  Stream #0.1: Audio: adpcm_ima_wav, 44100 Hz, stereo, s16, 352 kb/s
  
  Stream mapping:
  
  Stream #0.0 -> #0.0
  
  Stream #0.1 -> #0.1
  
  Press [q] to stop, [?] for help
  
  frame= 43 fps= 0 q=1.0 size= 1330kB time=00:00:02.12 bitrate=5135.7kbits/sframe= 87 fps= 86 q=1.0 size= 2712kB time=00:00:04.35 bitrate=5097.2kbits/sframe= 135 fps= 89 q=1.0 size= 3579kB time=00:00:06.78 bitrate=4324.9kbits/sframe= 185 fps= 92 q=1.0 size= 4307kB time=00:00:09.27 bitrate=3805.9kbits/sframe= 231 fps= 92 q=1.0 size= 5208kB time=00:00:11.55 bitrate=3692.4kbits/sframe= 276 fps= 91 q=1.0 size= 6129kB time=00:00:13.83 bitrate=3628.5kbits/sframe= 318 fps= 90 q=1.0 size= 6978kB time=00:00:15.91 bitrate=3592.6kbits/sframe= 366 fps= 91 q=1.0 size= 7990kB time=00:00:18.33 bitrate=3570.2kbits/sframe= 408 fps= 90 q=1.0 size= 8912kB time=00:00:20.43 bitrate=3573.2kbits/sframe= 451 fps= 90 q=1.0 size= 9831kB time=00:00:22.55 bitrate=3570.9kbits/sframe= 495 fps= 89 q=1.0 size= 10827kB time=00:00:24.74 bitrate=3584.4kbits/sframe= 539 fps= 89 q=1.0 size= 11845kB time=00:00:26.91 bitrate=3605.5kbits/sframe= 583 fps= 89 q=1.0 size= 12939kB time=00:00:29.14 bitrate=3636.2kbits/sframe= 630 fps= 89 q=1.0 size= 13790kB time=00:00:31.52 bitrate=3583.5kbits/sframe= 676 fps= 89 q=1.0 size= 14710kB time=00:00:33.80 bitrate=3564.4kbits/sframe= 723 fps= 90 q=1.0 size= 15651kB time=00:00:36.16 bitrate=3545.7kbits/sframe= 767 fps= 90 q=1.0 size= 16589kB time=00:00:38.35 bitrate=3543.6kbits/sframe= 809 fps= 89 q=1.0 size= 17576kB time=00:00:40.42 bitrate=3561.7kbits/sframe= 852 fps= 89 q=1.0 size= 18598kB time=00:00:42.61 bitrate=3575.0kbits/sframe= 898 fps= 89 q=1.0 size= 19548kB time=00:00:44.90 bitrate=3566.6kbits/sframe= 940 fps= 89 q=1.0 size= 20666kB time=00:00:46.97 bitrate=3603.9kbits/sframe= 982 fps= 89 q=1.0 size= 21739kB time=00:00:49.12 bitrate=3625.5kbits/sframe= 1024 fps= 88 q=1.0 size= 22711kB time=00:00:51.25 bitrate=3630.2kbits/sframe= 1070 fps= 88 q=1.0 size= 23769kB time=00:00:53.47 bitrate=3640.9kbits/sframe= 1118 fps= 89 q=1.0 size= 24935kB time=00:00:55.90 bitrate=3654.2kbits/sframe= 1165 fps= 89 q=1.0 size= 26047kB time=00:00:58.22 bitrate=3664.3kbits/sframe= 1213 fps= 89 q=1.0 size= 27187kB time=00:01:00.62 bitrate=3673.5kbits/sframe= 1265 fps= 90 q=1.0 size= 27935kB time=00:01:03.23 bitrate=3619.0kbits/sframe= 1315 fps= 90 q=1.0 size= 28590kB time=00:01:05.79 bitrate=3559.7kbits/sframe= 1366 fps= 90 q=1.0 size= 29229kB time=00:01:08.30 bitrate=3505.3kbits/sframe= 1415 fps= 91 q=1.0 size= 29928kB time=00:01:10.75 bitrate=3465.2kbits/sframe= 1464 fps= 91 q=1.0 size= 30612kB time=00:01:13.25 bitrate=3423.5kbits/sframe= 1512 fps= 91 q=1.0 size= 31309kB time=00:01:15.64 bitrate=3390.8kbits/sframe= 1561 fps= 91 q=1.0 size= 31997kB time=00:01:18.06 bitrate=3357.8kbits/sframe= 1608 fps= 91 q=1.0 size= 32760kB time=00:01:20.36 bitrate=3339.3kbits/sframe= 1654 fps= 91 q=1.0 size= 33563kB time=00:01:22.69 bitrate=3324.7kbits/sframe= 1700 fps= 91 q=1.0 size= 34318kB time=00:01:24.98 bitrate=3308.2kbits/sframe= 1745 fps= 91 q=1.0 size= 35041kB time=00:01:27.24 bitrate=3290.4kbits/sframe= 1791 fps= 91 q=1.0 size= 35749kB time=00:01:29.56 bitrate=3269.6kbits/sframe= 1837 fps= 91 q=1.0 size= 36442kB time=00:01:31.85 bitrate=3250.1kbits/sframe= 1884 fps= 91 q=1.0 size= 37121kB time=00:01:34.20 bitrate=3228.0kbits/sframe= 1931 fps= 91 q=1.0 size= 37840kB time=00:01:36.53 bitrate=3211.1kbits/sframe= 1978 fps= 91 q=1.0 size= 38561kB time=00:01:38.90 bitrate=3193.8kbits/sframe= 2025 fps= 91 q=1.0 size= 39279kB time=00:01:41.28 bitrate=3176.9kbits/sframe= 2072 fps= 91 q=1.0 size= 40005kB time=00:01:43.59 bitrate=3163.6kbits/sframe= 2117 fps= 91 q=1.0 size= 40833kB time=00:01:45.87 bitrate=3159.5kbits/sframe= 2158 fps= 91 q=1.0 size= 41561kB time=00:01:47.90 bitrate=3155.3kbits/sframe= 2202 fps= 91 q=1.0 size= 42407kB time=00:01:50.14 bitrate=3154.1kbits/sframe= 2248 fps= 91 q=1.0 size= 43201kB time=00:01:52.42 bitrate=3147.9kbits/sframe= 2295 fps= 91 q=1.0 size= 43975kB time=00:01:54.75 bitrate=3139.3kbits/sframe= 2342 fps= 91 q=1.0 size= 44739kB time=00:01:57.10 bitrate=3129.7kbits/sframe= 2388 fps= 91 q=1.0 size= 45532kB time=00:01:59.43 bitrate=3123.0kbits/sframe= 2435 fps= 91 q=1.0 size= 46306kB time=00:02:01.80 bitrate=3114.5kbits/sframe= 2481 fps= 91 q=1.0 size= 47095kB time=00:02:04.02 bitrate=3110.7kbits/sframe= 2530 fps= 91 q=1.0 size= 47778kB time=00:02:06.49 bitrate=3094.3kbits/sframe= 2578 fps= 91 q=1.0 size= 48507kB time=00:02:08.91 bitrate=3082.5kbits/sframe= 2622 fps= 91 q=1.0 size= 49169kB time=00:02:11.08 bitrate=3072.9kbits/sframe= 2670 fps= 91 q=1.0 size= 49851kB time=00:02:13.54 bitrate=3057.9kbits/sframe= 2718 fps= 91 q=1.0 size= 50531kB time=00:02:15.92 bitrate=3045.5kbits/sframe= 2764 fps= 91 q=1.0 size= 51242kB time=00:02:18.18 bitrate=3037.8kbits/sframe= 2810 fps= 92 q=1.0 size= 51959kB time=00:02:20.51 bitrate=3029.3kbits/sframe= 2835 fps= 90 q=1.0 size= 52376kB time=00:02:21.78 bitrate=3026.2kbits/sframe= 2879 fps= 90 q=1.0 size= 53093kB time=00:02:23.94 bitrate=3021.5kbits/sframe= 2923 fps= 90 q=1.0 size= 53853kB time=00:02:26.18 bitrate=3017.8kbits/sframe= 2968 fps= 90 q=1.0 size= 54594kB time=00:02:28.39 bitrate=3013.7kbits/sframe= 3012 fps= 90 q=1.0 size= 55444kB time=00:02:30.63 bitrate=3015.2kbits/sframe= 3056 fps= 90 q=1.0 size= 56495kB time=00:02:32.78 bitrate=3029.2kbits/sframe= 3098 fps= 90 q=1.0 size= 57463kB time=00:02:34.90 bitrate=3039.0kbits/sframe= 3141 fps= 90 q=1.0 size= 58433kB time=00:02:37.04 bitrate=3048.0kbits/sframe= 3186 fps= 90 q=1.0 size= 59457kB time=00:02:39.33 bitrate=3057.0kbits/sframe= 3232 fps= 90 q=1.0 size= 60471kB time=00:02:41.59 bitrate=3065.6kbits/sframe= 3277 fps= 90 q=1.0 size= 61485kB time=00:02:43.82 bitrate=3074.5kbits/sframe= 3322 fps= 90 q=1.0 size= 62297kB time=00:02:46.11 bitrate=3072.3kbits/sframe= 3365 fps= 90 q=1.0 size= 63043kB time=00:02:48.27 bitrate=3069.0kbits/sframe= 3409 fps= 90 q=1.0 size= 63752kB time=00:02:50.46 bitrate=3063.7kbits/sframe= 3455 fps= 90 q=1.0 size= 64529kB time=00:02:52.75 bitrate=3060.0kbits/sframe= 3499 fps= 90 q=1.0 size= 65306kB time=00:02:54.96 bitrate=3057.7kbits/sframe= 3545 fps= 90 q=1.0 size= 66070kB time=00:02:57.24 bitrate=3053.6kbits/sframe= 3594 fps= 90 q=1.0 size= 66804kB time=00:02:59.71 bitrate=3045.1kbits/sframe= 3644 fps= 90 q=1.0 size= 67554kB time=00:03:02.18 bitrate=3037.6kbits/sframe= 3690 fps= 90 q=1.0 size= 68436kB time=00:03:04.48 bitrate=3038.8kbits/sframe= 3740 fps= 90 q=1.0 size= 69121kB time=00:03:07.00 bitrate=3028.0kbits/sframe= 3787 fps= 90 q=1.0 size= 69953kB time=00:03:09.33 bitrate=3026.7kbits/sframe= 3832 fps= 90 q=1.0 size= 70857kB time=00:03:11.59 bitrate=3029.7kbits/sframe= 3878 fps= 90 q=1.0 size= 71622kB time=00:03:13.92 bitrate=3025.6kbits/sframe= 3925 fps= 90 q=1.0 size= 72343kB time=00:03:16.25 bitrate=3019.8kbits/sframe= 3973 fps= 90 q=1.0 size= 73100kB time=00:03:18.64 bitrate=3014.5kbits/sframe= 4021 fps= 90 q=1.0 size= 73867kB time=00:03:21.07 bitrate=3009.5kbits/sframe= 4070 fps= 90 q=1.0 size= 74643kB time=00:03:23.53 bitrate=3004.2kbits/sframe= 4119 fps= 90 q=1.0 size= 75363kB time=00:03:25.95 bitrate=2997.6kbits/sframe= 4167 fps= 90 q=1.0 size= 76077kB time=00:03:28.35 bitrate=2991.1kbits/sframe= 4216 fps= 91 q=1.0 size= 76751kB time=00:03:30.77 bitrate=2983.0kbits/sframe= 4263 fps= 91 q=1.0 size= 77432kB time=00:03:33.15 bitrate=2975.9kbits/sframe= 4315 fps= 91 q=1.0 size= 78087kB time=00:03:35.73 bitrate=2965.1kbits/sframe= 4367 fps= 91 q=1.0 size= 78795kB time=00:03:38.34 bitrate=2956.3kbits/sframe= 4418 fps= 91 q=1.0 size= 79475kB time=00:03:40.90 bitrate=2947.2kbits/sframe= 4469 fps= 91 q=1.0 size= 80174kB time=00:03:43.46 bitrate=2939.1kbits/sframe= 4519 fps= 91 q=1.0 size= 80865kB time=00:03:45.90 bitrate=2932.4kbits/sframe= 4567 fps= 91 q=1.0 size= 81621kB time=00:03:48.32 bitrate=2928.4kbits/sframe= 4611 fps= 91 q=1.0 size= 82613kB time=00:03:50.56 bitrate=2935.2kbits/sframe= 4655 fps= 91 q=1.0 size= 83653kB time=00:03:52.80 bitrate=2943.7kbits/sframe= 4699 fps= 91 q=1.0 size= 84646kB time=00:03:54.97 bitrate=2951.1kbits/sframe= 4743 fps= 91 q=1.0 size= 85543kB time=00:03:57.20 bitrate=2954.3kbits/sframe= 4789 fps= 91 q=1.0 size= 86344kB time=00:03:59.42 bitrate=2954.3kbits/sframe= 4836 fps= 91 q=1.0 size= 87090kB time=00:04:01.79 bitrate=2950.6kbits/sframe= 4883 fps= 91 q=1.0 size= 87821kB time=00:04:04.17 bitrate=2946.4kbits/sframe= 4930 fps= 91 q=1.0 size= 88571kB time=00:04:06.50 bitrate=2943.5kbits/sframe= 4977 fps= 91 q=1.0 size= 89318kB time=00:04:08.85 bitrate=2940.3kbits/sframe= 5024 fps= 91 q=1.0 size= 90014kB time=00:04:11.18 bitrate=2935.7kbits/sframe= 5070 fps= 91 q=1.0 size= 90743kB time=00:04:13.55 bitrate=2931.8kbits/sframe= 5120 fps= 91 q=1.0 size= 91438kB time=00:04:16.00 bitrate=2926.0kbits/sframe= 5165 fps= 91 q=1.0 size= 92265kB time=00:04:18.28 bitrate=2926.4kbits/sframe= 5211 fps= 91 q=1.0 size= 93079kB time=00:04:20.56 bitrate=2926.3kbits/sframe= 5258 fps= 91 q=1.0 size= 93913kB time=00:04:22.87 bitrate=2926.6kbits/sframe= 5304 fps= 91 q=1.0 size= 94739kB time=00:04:25.20 bitrate=2926.4kbits/sframe= 5351 fps= 91 q=1.0 size= 95565kB time=00:04:27.60 bitrate=2925.5kbits/sframe= 5398 fps= 91 q=1.0 size= 96368kB time=00:04:29.90 bitrate=2924.9kbits/sframe= 5444 fps= 91 q=1.0 size= 97176kB time=00:04:32.16 bitrate=2924.9kbits/sframe= 5490 fps= 91 q=1.0 size= 98049kB time=00:04:34.54 bitrate=2925.6kbits/sframe= 5538 fps= 91 q=1.0 size= 98914kB time=00:04:36.91 bitrate=2926.1kbits/sframe= 5587 fps= 91 q=1.0 size= 99817kB time=00:04:39.36 bitrate=2927.0kbits/sframe= 5636 fps= 91 q=1.0 size= 100709kB time=00:04:41.83 bitrate=2927.3kbits/sframe= 5682 fps= 91 q=1.0 size= 101490kB time=00:04:44.11 bitrate=2926.3kbits/sframe= 5732 fps= 91 q=1.0 size= 102230kB time=00:04:46.60 bitrate=2922.0kbits/sframe= 5781 fps= 91 q=1.0 size= 102991kB time=00:04:49.07 bitrate=2918.6kbits/sframe= 5827 fps= 91 q=1.0 size= 103918kB time=00:04:51.35 bitrate=2921.8kbits/sframe= 5874 fps= 92 q=1.0 size= 104873kB time=00:04:53.73 bitrate=2924.9kbits/sframe= 5921 fps= 92 q=1.0 size= 105844kB time=00:04:56.08 bitrate=2928.5kbits/sframe= 5970 fps= 92 q=1.0 size= 106670kB time=00:04:58.50 bitrate=2927.4kbits/sframe= 6028 fps= 92 q=1.0 size= 108198kB time=00:05:01.43 bitrate=2940.5kbits/sframe= 6080 fps= 91 q=1.0 size= 109527kB time=00:05:03.99 bitrate=2951.5kbits/sframe= 6138 fps= 92 q=1.0 size= 110623kB time=00:05:06.85 bitrate=2953.3kbits/sframe= 6156 fps= 92 q=1.0 Lsize= 111017kB time=00:05:07.85 bitrate=2954.2kbits/s dup=0 drop=3067

  video:97193kB audio:13354kB global headers:0kB muxing overhead 0.425158%

  Where is my problem ?

• Perspective transformations

  9 juin 2010, par Mikko Koppanen — Imagick, PHP stuff

  Finally (after a long break) I managed to force myself to update the PHP documentation and this time it was distortImage code example. Things have been hectic lately but that does not quite explain the 6 months(?) break between this and the previous post. As a matter of a fact there is no excuse for such a long silence so I will try to update this blog a bit more often from now on.

  Back in the day I used to blog the examples and update the documentation if I remembered but I am trying to fix this bad habit. Most of the latest examples have been updated in to the manual. In the case of the two last examples I updated the documentation first and then blogged on the subject.

  I took some time to actually understand the perspective transformations properly using the excellent ImageMagick examples (mainly created by Anthony Thyssen) as a reference. The basic idea of perspective distortion seems simple : to distort the control points to new locations. Grabbing the syntax for Imagick was easy, an array of control point pairs in the form of :

  php

  < view plain text >

  1. array(source_x, source_y, dest_x, dest_y ... )

  The following example uses the built-in checkerboard pattern to demonstrate perspective distortion :

  php

  < view plain text >

  1. < ?php
  2. /* Create new object */
  3. $im = new Imagick() ;
  4.  
  5. /* Create new checkerboard pattern */
  6. $im->newPseudoImage(100, 100, "pattern:checkerboard") ;
  7.  
  8. /* Set the image format to png */
  9. $im->setImageFormat(’png’) ;
  10.  
  11. /* Fill background area with transparent */
  12. $im->setImageVirtualPixelMethod(Imagick: :VIRTUALPIXELMETHOD_TRANSPARENT) ;
  13.  
  14. /* Activate matte */
  15. $im->setImageMatte(true) ;
  16.  
  17. /* Control points for the distortion */
  18. $controlPoints = array( 10, 10,
  19.             10, 5,
  20.  
  21.             10, $im->getImageHeight() - 20,
  22.             10, $im->getImageHeight() - 5,
  23.  
  24.             $im->getImageWidth() - 10, 10,
  25.             $im->getImageWidth() - 10, 20,
  26.  
  27.             $im->getImageWidth() - 10, $im->getImageHeight() - 10,
  28.             $im->getImageWidth() - 10, $im->getImageHeight() - 30) ;
  29.  
  30. /* Perform the distortion */ 
  31. $im->distortImage(Imagick: :DISTORTION_PERSPECTIVE, $controlPoints, true) ;
  32.  
  33. /* Ouput the image */ 
  34. header("Content-Type : image/png") ;
  35. echo $im ;
  36.  ?>

  Here is the source image :
  

  And the result :
  

• Typesetting

  9 juin 2010, par Mikko Koppanen — Imagick, PHP stuff

  Ever had the situation where you have a piece of string which you need to overlay on an image ? Maybe a situation where the area reserved for the string is known in pixels but you need to know the font size to fill most of the area ? Think no more !

  Here is a small example of how to fit a certain piece of a string on to an area of which you know the width and the height or only the width. The magic happens through the ImageMagick CAPTION : format. You can see from the example images how the parameters actually affect the image.

  php

  < view plain text >

  1. < ?php
  2.  
  3. /* How wide is our image */
  4. $image_width = 200 ;
  5.  
  6. /* Give zero for autocalculating the height */
  7. $image_height = 200 ;
  8.  
  9. /* Specify the text */
  10. $text = "Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
  11.     Mauris lectus mi, mattis non, euismod vel, sagittis nec, ipsum." ;
  12.  
  13. /* Instanciate imagick */
  14. $im = new Imagick() ;
  15.  
  16. /* Create new image using caption : pseudo format */
  17. $im->newPseudoImage( $image_width, $image_height, "caption :" . $text ) ;
  18.  
  19. /* Put 1px border around the image */
  20. $im->borderImage( ’black’, 1, 1 ) ;
  21.  
  22. /* PNG format */
  23. $im->setImageFormat( "png")  ;
  24.  
  25. /* Output */
  26. header( "Content-Type : image/png" ) ;
  27. echo $im ;
  28.  
  29.  ?>

  Here is image with width 100 and height 0 :

  

  Width 100 Height 50 :

  

  Width 200 Height 200 (as you can see the font size is now larger) :