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Sur d’autres sites (4552)

  • Extracting text subtitles using ffmpeg libraries

    6 avril 2013, par John Smith

    I'm writing a C program that uses the ffmpeg's libav* libs, and using Dranger's tutorial, I can decode both audio and video correctly. Currently, I'm trying to extract subtitles. I actually don't want to decode them on time and display them on the video, but actually extract the subtitle text out of the container.

    For example, on the cli,

    ffmpeg -i video.mkv -map 0:4 -scodec copy out.ass

    would give me the ass file back. (For some reason, srts only return the text.)

    I've tried messing with AVSubtitle, avcodec_decode_subtitle2, etc., but they're returning the subtitles line by line. I would like the timecodes in srts, header information in ass, etc. All I want is the entire subtitle text file that was muxed into the container.

  • ffmpeg subtitles to overlay by language

    21 mars 2017, par Milan Čížek

    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.

    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

  • ffmpeg convert mp4 to mkv without re-encoding with subtitles

    1er mai 2021, par Juliette

    I would like to convert a mp4 video into mkv without re-encoding, but I would like to keep the different audio tracks and subtitles.
I've tried :

    


    ffmpeg -i input.mp4 -vcodec copy -acodec copy output.mkv

    


    But this only keeps the first audio track and the first subtitle but not the other ones.
How could I do this ?

    


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