[FFmpeg-trac] #6167(avfilter:new): ffmpeg subtitles to overlay by language

[FFmpeg]

#6167: ffmpeg subtitles to overlay by language
----------------------------------+---------------------------------------
             Reporter:  milanc    |                     Type:  enhancement
               Status:  new       |                 Priority:  normal
            Component:  avfilter  |                  Version:  unspecified
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
----------------------------------+---------------------------------------
 How to reproduce:
 {{{ ffmpeg version N-83522-g6a37abc }}}


 {{{
 my stream looks like this:
 Input #0, mpegts, from 'udp://@...':
   Duration: N/A, start: 19316.897278, bitrate: N/A
   Program 504
     Stream #0:0[0x13b1], 125, 1/90000: Video: mpeg2video (Main), 1
 reference frame ([2][0][0][0] / 0x0002), yuv420p(tv, top first, left),
 720x576 [SAR 64:45 DAR 16:9], 0/1, 25 fps, 25 tbr, 90k tbn, 50 tbc
     Stream #0:1[0x13b2], 208, 1/90000: Audio: mp2 ([3][0][0][0] / 0x0003),
 48000 Hz, stereo, s16p, 256 kb/s
     Stream #0:2[0x1541](srp), 4, 1/90000: Subtitle: dvb_subtitle
 ([6][0][0][0] / 0x0006)
     Stream #0:3[0x1542](slv), 3, 1/90000: Subtitle: dvb_subtitle
 ([6][0][0][0] / 0x0006)
     Stream #0:4[0x1543](hrv), 4, 1/90000: Subtitle: dvb_subtitle
 ([6][0][0][0] / 0x0006)
     Stream #0:5[0x1544](cze), 3, 1/90000: Subtitle: dvb_subtitle
 ([6][0][0][0] / 0x0006)
     Stream #0:6[0x1545](hun), 4, 1/90000: Subtitle: dvb_subtitle
 ([6][0][0][0] / 0x0006)
     Stream #0:7[0x1546](ron), 3, 1/90000: Subtitle: dvb_subtitle
 ([6][0][0][0] / 0x0006)
     Stream #0:8[0x1547](alb), 4, 1/90000: Subtitle: dvb_subtitle
 ([6][0][0][0] / 0x0006)
     Stream #0:9[0x1548](bul), 5, 1/90000: Subtitle: dvb_subtitle
 ([6][0][0][0] / 0x0006)
     Stream #0:10[0x13b9](eng), 127, 1/90000: Subtitle: dvb_teletext
 ([6][0][0][0] / 0x0006)
 }}}

 I try to add english subtitles into output video, but number of
 subtitles/languages is variable in time. I need select required subtitles
 by language. How can I do? Here is my not working example. Thank you.

 I tried eg.

 {{{
 ffmpeg -i "udp://@..." -map s:eng -sn -map v:0 -profile:v baseline
 -c:v libx264 -b:v 1500k -maxrate 2200k -filter_complex [0:v][0:s]overlay
 -c:a libfdk_aac -b:a 128k /test.ts

 -filter_complex [0:v][s:10]overlay ...

 ffmpeg -i "udp://@..." -map m:language:eng -map "sub" -map v:0 -profile:v
 baseline -c:v libx264 -b:v 1500k -maxrate 2200k -bufsize 4400k
 -deinterlace -filter_complex
 "[0:v]crop=in_w-0:in_h-0[cropped];[cropped]scale=720:576[scaled];[scaled]unsharp=3:3:0.5:3:3:0.5[unsharped];[unsharped][sub]overlay"
 -keyint_min 15 -g 150 -map a:0 -c:a libfdk_aac -b:a 128k -ar 44100 -ac 2
 -sn /a.ts
 }}}

 But every time I have in the video srp [0] subtitles.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6167>
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