$ gdb --args ~/repository/mpv-build_vanilla_debug/mpv/build/mpv vobsub_crash.mkv
GNU gdb (Gentoo 7.7.1 p1) 7.7.1
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Reading symbols from /home/cocobo/repository/mpv-build_vanilla_debug/mpv/build/mpv...done.
(gdb) r
Starting program: /home/cocobo/repository/mpv-build_vanilla_debug/mpv/build/mpv vobsub_crash.mkv
warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7fffed4e7700 (LWP 9110)]
[New Thread 0x7fffecce6700 (LWP 9111)]
[New Thread 0x7fffe7fff700 (LWP 9112)]
Playing: vobsub_crash.mkv
[New Thread 0x7fffe77fe700 (LWP 9113)]
[Thread 0x7fffe77fe700 (LWP 9113) exited]
[New Thread 0x7fffe77fe700 (LWP 9114)]
[New Thread 0x7fffe6ffd700 (LWP 9115)]
[ffmpeg/demuxer] matroska,webm: Unknown EBML doctype 'matro@ka'
[ffmpeg] ?: Truncating packet of size 106212971 to 1889
[ffmpeg] ?: Truncating packet of size 11581 to 1507                                                    
[ffmpeg/video] h264: missing picture in access unit with size 84                                       
[ffmpeg/video] h264: no frame!                                                                         
[ffmpeg/video] h264: missing picture in access unit with size 186                                      
[ffmpeg/video] h264: no frame!                                                                         
[ffmpeg/video] h264: missing picture in access unit with size 130                                      
[ffmpeg/video] h264: no frame!                                                                         
[ffmpeg/video] h264: missing picture in access unit with size 384                                      
[ffmpeg/video] h264: no frame!                                                                         
[ffmpeg/demuxer] matroska,webm: Read error at pos. 1235 (0x4d3)                                        
[ffmpeg] ?: Truncating packet of size 1056768 to 542                                                   
[ffmpeg/demuxer] matroska,webm: Read error at pos. 1758 (0x6de)                                        
[ffmpeg/demuxer] matroska,webm: Read error at pos. 2024 (0x7e8)                                        
[ffmpeg/demuxer] matroska,webm: Could not find codec parameters for stream 0 (Video: h264 (h264 / 0x34363268), none, 720x432): unspecified pixel format                                                       
[ffmpeg/demuxer] Consider increasing the value for the 'analyzeduration' and 'probesize' options       
[Thread 0x7fffe6ffd700 (LWP 9115) exited]
[stream] Video (+) --vid=1 (*) (h264)
[stream] Subs  (+) --sid=1 --slang=eng (*) (dvd_subtitle)
[New Thread 0x7fffe6ffd700 (LWP 9116)]
[New Thread 0x7fffe67fc700 (LWP 9117)]
[New Thread 0x7fffdf990700 (LWP 9118)]
[New Thread 0x7fffdef8a700 (LWP 9119)]
[New Thread 0x7fffde789700 (LWP 9120)]
[New Thread 0x7fffddf88700 (LWP 9121)]
[New Thread 0x7fffdd787700 (LWP 9122)]
[New Thread 0x7fffdcf86700 (LWP 9123)]
[New Thread 0x7fffd7fff700 (LWP 9124)]
[New Thread 0x7fffd77fe700 (LWP 9125)]
[New Thread 0x7fffd6ffd700 (LWP 9126)]
[sub/lavc] Subtitle with unknown start time.
[ffmpeg/video] h264: no frame!
[sub/lavc] Subtitle with unknown start time.

Program received signal SIGSEGV, Segmentation fault.
0x00000000009da4a8 in get_bits (s=0x7fffffffd290, n=4)
    at /home/cocobo/repository/mpv-build_vanilla_debug/ffmpeg/libavcodec/get_bits.h:265
265         UPDATE_CACHE(re, s);
(gdb) bt full
#0  0x00000000009da4a8 in get_bits (s=0x7fffffffd290, n=4)
    at /home/cocobo/repository/mpv-build_vanilla_debug/ffmpeg/libavcodec/get_bits.h:265
        tmp = 0
        re_index = 0
        re_cache = 4059456702
        re_size_plus8 = 1878814992
#1  0x00000000009da842 in decode_run_2bit (gb=0x7fffffffd290, color=0x7fffffffd274)
    at /home/cocobo/repository/mpv-build_vanilla_debug/ffmpeg/libavcodec/dvdsubdec.c:73
        v = 0
        t = 1
#2  0x00000000009da9f7 in decode_rle (bitmap=0x2a8cb80 "", linesize=2, w=1, h=1, buf=0x2a8c9b0 "", 
    start=302019492, buf_size=453, is_8bit=0)
    at /home/cocobo/repository/mpv-build_vanilla_debug/ffmpeg/libavcodec/dvdsubdec.c:123
        gb = {buffer = 0x14a93d54 <error: Cannot access memory at address 0x14a93d54>, 
          buffer_end = 0x22a8cb75 <error: Cannot access memory at address 0x22a8cb75>, index = 0, 
          size_in_bits = 1878814984, size_in_bits_plus8 = 1878814992}
        bit_len = 1878814984
        x = 0
        y = 0
        len = -11600
        color = 0
        d = 0x2a8cb80 ""
#3  0x00000000009db85e in decode_dvd_subtitles (ctx=0x228bda0, sub_header=0x7fffffffd5a0, 
    buf=0x2a8c9b0 "", buf_size=453)
    at /home/cocobo/repository/mpv-build_vanilla_debug/ffmpeg/libavcodec/dvdsubdec.c:362
        w = 1
        h = 1
        bitmap = 0x2a8cb80 ""
        cmd_pos = 245
        pos = 264
        cmd = 35
        x1 = 0
        y1 = 0
        x2 = 0
        y2 = 0
        offset1 = 302019492
        offset2 = -2147426757
        next_cmd_pos = 24968
        big_offsets = 0
        offset_size = 2
        is_8bit = 0
        yuv_palette = 0x0
        colormap = 0x228bdfc ""
        alpha = 0x228be00 ""
        date = 68
        i = 0
        is_menu = 0
#4  0x00000000009dc1dc in dvdsub_decode (avctx=0x228b8e0, data=0x7fffffffd5a0, 
    data_size=0x7fffffffd534, avpkt=0x7fffffffd450)
    at /home/cocobo/repository/mpv-build_vanilla_debug/ffmpeg/libavcodec/dvdsubdec.c:538
        ctx = 0x228bda0
        buf = 0x2a8c9b0 ""
        buf_size = 453
        sub = 0x7fffffffd5a0
        is_menu = -11
#5  0x0000000000e86904 in avcodec_decode_subtitle2 (avctx=0x228b8e0, sub=0x7fffffffd5a0, 
    got_sub_ptr=0x7fffffffd534, avpkt=0x7fffffffd5c0)
    at /home/cocobo/repository/mpv-build_vanilla_debug/ffmpeg/libavcodec/utils.c:2751
        pkt_recoded = {buf = 0x0, pts = -9223372036854775808, dts = -9223372036854775808, 
          data = 0x7fffd833a290 "", size = 226, stream_index = 0, flags = 0, side_data = 0x0, 
          side_data_elems = 0, duration = 0, destruct = 0x0, priv = 0x7fffffffd610, pos = -1, 
          convergence_duration = 0}
        tmp = {buf = 0x0, pts = -9223372036854775808, dts = -9223372036854775808, 
          data = 0x7fffd833a290 "", size = 226, stream_index = 0, flags = 0, side_data = 0x0, 
          side_data_elems = 0, duration = 0, destruct = 0x0, priv = 0x7fffffffd610, pos = -1, 
          convergence_duration = 0}
        did_split = 0
        i = 0
        ret = 0
#6  0x00000000004d83b4 in decode (sd=0x228b460, packet=0x7fffd0001350) at ../sub/sd_lavc.c:208
        opts = 0x20182a0
        priv = 0x228b720
        ctx = 0x228b8e0
        pts = -9.2233720368547758e+18
        duration = -1
        sub = {format = 0, start_display_time = 0, end_display_time = 0, num_rects = 1, 
          rects = 0x2290140, pts = -9223372036854775808}
        pkt = {buf = 0x0, pts = -9223372036854775808, dts = -9223372036854775808, 
          data = 0x7fffd833a290 "", size = 226, stream_index = 0, flags = 0, side_data = 0x0, 
          side_data_elems = 0, duration = 0, destruct = 0x0, priv = 0x7fffffffd610, pos = -1, 
          convergence_duration = 0}
        got_sub = 0
        res = 0
        endpts = 6.9533558072966704e-310
        current = 0x100000000
        __PRETTY_FUNCTION__ = "decode"
#7  0x00000000004cd8d1 in decode_chain (sd=0x22972d0, num_sd=1, packet=0x7fffd0001350)
    at ../sub/dec_sub.c:255
        dec = 0x228b460
#8  0x00000000004cdab0 in decode_chain_recode (sub=0x2297200, sd=0x22972d0, num_sd=1, 
    packet=0x7fffd0001350) at ../sub/dec_sub.c:294
        recoded = 0x0
#9  0x00000000004cdaff in sub_decode (sub=0x2297200, packet=0x7fffd0001350) at ../sub/dec_sub.c:302
No locals.
#10 0x00000000004a0814 in update_subtitle (mpctx=0x2015050, order=0) at ../player/sub.c:271
        subpts_s = -9.2233720368547758e+18
        pkt = 0x7fffd0001350
        sh_stream = 0x7fffd8339f00
        interleaved = true
        opts = 0x20182a0
        track = 0x2274c40
        dec_sub = 0x2297200
        obj = 0
        state = {dec_sub = 0x2297200, video_offset = 0, render_bitmap_subs = true}
        refpts_s = -9.2233720368547758e+18
        curpts_s = -9.2233720368547758e+18
        __PRETTY_FUNCTION__ = "update_subtitle"
#11 0x00000000004a08e7 in update_subtitles (mpctx=0x2015050) at ../player/sub.c:287
No locals.
#12 0x000000000049dcd4 in run_playloop (mpctx=0x2015050) at ../player/playloop.c:963
        opts = 0x20182a0
        endpts = -9.2233720368547758e+18
        end_is_new_segment = false
        prevent_eof = false
#13 0x00000000004924ca in play_current_file (mpctx=0x2015050) at ../player/loadfile.c:1182
        opts = 0x20182a0
        tmp = 0x204e840
        playback_start = 10.312787999999999
        __PRETTY_FUNCTION__ = "play_current_file"
        stream_flags = 0
        startpos = -9.2233720368547758e+18
        nothing_played = false
        end_event = {reason = -10048, error = 32767}
#14 0x0000000000492be4 in mp_play_files (mpctx=0x2015050) at ../player/loadfile.c:1339
        new_entry = 0x20182a0
#15 0x0000000000493ff3 in mpv_main (argc=2, argv=0x7fffffffda58) at ../player/main.c:550
        mpctx = 0x2015050
        opts = 0x20182a0
        verbose_env = 0x0
        r = 0
#16 0x0000000000411e6d in main (argc=2, argv=0x7fffffffda58) at ../player/main_fn.c:13
No locals.