[FFmpeg-trac] #4074(ffmpeg:new): option canvas_size has no effect on dvb_subtitles

FFmpeg trac at avcodec.org
Mon Nov 3 11:58:06 CET 2014


#4074: option canvas_size has no effect on dvb_subtitles
-------------------------------------+-------------------------------------
             Reporter:  malakudi     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  ffmpeg       |                  Version:  2.4.3
             Keywords:  canvas_size  |               Blocked By:
  sub2video dvb_subtitle             |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 After commit
 http://git.videolan.org/?p=ffmpeg.git;a=commit;h=921d5ae3bcff07acb88d2e2767047c6b942c31bc
 , option -canvas_size has no effect on the rendering of dvb_subtitles in
 mpeg-ts files.
 How to reproduce:
 {{{
 ffmpeg -canvas_size 720x576  -f mpegts -i
 'udp:127.0.0.1:5550?fifo_size=160000&buffer_size=2097152&overrun_nonfatal=1'
 -filter_complex
 '[#0x102]scale=1280:720:flags=bicublin[sub];[#0x100]scale=1280:720:flags=bicublin[video];[video][sub]overlay[v]'
 -map [v] -map '#0x101' -f null nul

 ffmpeg version 2.4.2 - also tried with 2.4.3

 ffmpeg-2.4.2 -canvas_size 720x576 -f mpegts -i
 'udp:127.0.0.1:5550?fifo_size=160000&buffer_size=2097152&overrun_nonfatal=1'
 -filter_complex
 '[#0x102]scale=1280:720:flags=bicublin[sub];[#0x100]scale=1280:720:flags=bicublin[video];[video][sub]overlay[v]'
 -map [v] -map '#0x101' -f null nul
 ffmpeg version 2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
   built on Oct 21 2014 11:32:09 with gcc 4.8 (Debian 4.8.3-11)
   configuration: --prefix=/usr/src/ffmpeg/ffmpeg_build --extra-
 cflags=-I/usr/src/ffmpeg/ffmpeg_build/include --extra-
 ldflags=-L/usr/src/ffmpeg/ffmpeg_build/lib --bindir=/usr/src/ffmpeg/bin
 --extra-libs=-static --enable-gpl --enable-version3 --enable-static
 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-
 libmp3lame --enable-libx264 --enable-libopenjpeg --enable-libvo-aacenc
 --enable-libvo-amrwbenc --enable-libopencore-amrnb --enable-libopencore-
 amrwb --enable-libspeex --enable-libvorbis --enable-libvpx --enable-
 libfreetype --enable-gray --enable-libtheora --enable-libopus --enable-
 fontconfig --enable-libass --enable-libfaac --enable-libfdk-aac --enable-
 libzvbi --enable-nonfree --disable-ffserver --cc=gcc-4.8
   libavutil      54.  7.100 / 54.  7.100
   libavcodec     56.  1.100 / 56.  1.100
   libavformat    56.  4.101 / 56.  4.101
   libavdevice    56.  0.100 / 56.  0.100
   libavfilter     5.  1.100 /  5.  1.100
   libswscale      3.  0.100 /  3.  0.100
   libswresample   1.  1.100 /  1.  1.100
   libpostproc    53.  0.100 / 53.  0.100
 Input #0, mpegts, from
 'udp:127.0.0.1:5550?fifo_size=160000&buffer_size=2097152&overrun_nonfatal=1':
   Duration: N/A, start: 18047.828667, bitrate: 185 kb/s
   Program 2011
     Metadata:
       service_name    : Test01
       service_provider: Test
     Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B),
 yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 50 fps, 50 tbr, 90k tbn,
 50 tbc
     Stream #0:1[0x101](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz,
 stereo, s16p, 185 kb/s
     Stream #0:2[0x102](eng): Subtitle: dvb_subtitle ([6][0][0][0] /
 0x0006), 720x576
 [mpegts @ 0x2829880] sub2video: using 1920x1080 canvas
 Output #0, null, to 'nul':
   Metadata:
     encoder         : Lavf56.4.101
     Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1280x720
 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 50 fps, 50 tbn, 50 tbc (default)
     Metadata:
       encoder         : Lavc56.1.100 rawvideo
     Stream #0:1(eng): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
     Metadata:
       encoder         : Lavc56.1.100 pcm_s16le
 Stream mapping:
   Stream #0:0 (h264) -> yadif (graph 0)
   Stream #0:2 (dvbsub) -> scale (graph 0)
   overlay (graph 0) -> Stream #0:0 (rawvideo)
   Stream #0:1 -> #0:1 (mp2 (native) -> pcm_s16le (native))
 Press [q] to stop, [?] for help

 }}}

 As can be seen in the log, -canvas_size sets dvb_subtitle resolution
 correctly but sub2video still uses video resolution (1920*1080) to render
 subtitles.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/4074>
FFmpeg <https://ffmpeg.org>
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