[MPlayer-users] MPEG/DVD crashing when taking screenshot

Josh joshf87 at live.com
Tue Oct 20 10:36:37 CEST 2015


On 10/13/2015 16:00, Roberto Togni wrote:
> On Fri, 25 Sep 2015 23:23:45 +0200
> Roberto Togni <rxt at rtogni.it> wrote:
>
>> On Thu, 24 Sep 2015 00:04:37 +0200
>> Roberto Togni <rxt at rtogni.it> wrote:
>>
>>> On Tue, 22 Sep 2015 00:38:28 -0400
>>> Josh <joshf87 at live.com> wrote:
>>>
>>>> On 9/21/2015 16:42, Roberto Togni wrote:
>>>>> On Mon, 21 Sep 2015 01:05:59 -0400
>>>>> Josh <joshf87 at live.com> wrote:
>>>>>
>>>>>> On 9/14/2015 17:40, Roberto Togni wrote:
>>>>>>> On Mon, 14 Sep 2015 20:59:46 +0200
>>>>>>> Roberto Togni <rxt at rtogni.it> wrote:
>>>>>>>
>>>>>>>> On Sun, 13 Sep 2015 00:26:42 -0400
>>>>>>>> Josh <joshf87 at live.com> wrote:
>>>>>>>>
>>>>>>>>> I compiled r37524 with a newer FFmpeg and got different but still
>>>>>>>>> seemingly useless results from gdb so I ran Dr Memory, both logs are
>>>>>>>>> included in the tar.xz. The logs themselves will get me queued for
>>>>>>>>> moderation for being too big:
>>>>>>>>>
>>>>>>>>> http://sourceforge.net/projects/mplayerwin/files/Misc/mpl-bin-r37524-debug-2.tar.xz/download
>>>>>>>>
>>>>>>>> Hi,
>>>>>>>>     just to keep you updated, I was able to reproduce it with your sample
>>>>>>>>     and get a valid backtrace on linux.
>>>>>>>>
>>>>>>>> ...
>>>>>>>> sending VFCTRL_SCREENSHOT!
>>>>>>>>
>>>>>>>> Program received signal SIGSEGV, Segmentation fault.
>>>>>>>> 0x0000555555f68625 in yuv2rgb_X_c_template (hasAlpha=0,
>>>>>>>>        target=AV_PIX_FMT_RGB24, y=13, dstW=2386, dest=0x555558be4680 "",
>>>>>>>>        alpSrc=0x0, chrFilterSize=4, chrVSrc=0x5555572d9a48,
>>>>>>>>        chrUSrc=0x55555711f128, chrFilter=0x5555572d76c8, lumFilterSize=1,
>>>>>>>>        lumSrc=0x55555712c5e8, lumFilter=0x55555711e8ba, c=<optimized out>)
>>>>>>>>        at libswscale/output.c:1340
>>>>>>>> 1340	            Y1 += lumSrc[j][i * 2]     * lumFilter[j];
>>>>>>>> (gdb) bt
>>>>>>>> #0  0x0000555555f68625 in yuv2rgb_X_c_template (hasAlpha=0,
>>>>>>>>        target=AV_PIX_FMT_RGB24, y=13, dstW=2386, dest=0x555558be4680 "",
>>>>>>>>        alpSrc=0x0, chrFilterSize=4, chrVSrc=0x5555572d9a48,
>>>>>>>>        chrUSrc=0x55555711f128, chrFilter=0x5555572d76c8, lumFilterSize=1,
>>>>>>>>        lumSrc=0x55555712c5e8, lumFilter=0x55555711e8ba, c=<optimized out>)
>>>>>>>>        at libswscale/output.c:1340
>>>>>>>> #1  yuv2rgb24_X_c (c=0x555557223520, lumFilter=0x55555711e8ba,
>>>>>>>>        lumSrc=0x55555712c5e8, lumFilterSize=1, chrFilter=0x5555572d76c8,
>>>>>>>>        chrUSrc=0x55555711f128, chrVSrc=0x5555572d9a48, chrFilterSize=4,
>>>>>>>>        alpSrc=0x0, dest=0x555558be4680 "", dstW=2386, y=13)
>>>>>>>>        at libswscale/output.c:1515
>>>>>>>> #2  0x0000555555f4dc9e in packed_vscale (c=<optimized out>,
>>>>>>>>        desc=<optimized out>, sliceY=13, sliceH=<optimized out>)
>>>>>>>>        at libswscale/vscale.c:129
>>>>>>>> #3  0x0000555555f3dc81 in swscale (c=0x5555572b12c0,
>>>>>>>> src=0x55555711e8a0, srcStride=0x1000, srcSliceY=1460470520,
>>>>>>>> srcSliceH=1460470480, dst=0x55555711f128, dstStride=0x7fffffffca80) at
>>>>>>>> libswscale/swscale.c:682 #4  0x0000555555f3ef4b in sws_scale
>>>>>>>> (c=0x5555572b12c0, srcSlice=0x7fffffffca90, srcStride=0x55555712c5e8,
>>>>>>>> srcSliceY=1, srcSliceH=1462597320, dst=0x7fffffffcab0,
>>>>>>>> dstStride=0x5555570f4c60) at libswscale/swscale.c:1263
>>>>>>>> #5  0x00005555558295da in draw_slice (vf=0x5555570f53b0,
>>>>>>>> src=0x7fffffffcb90, stride=0x7fffffffcb80, w=1920, h=16, x=1460791456,
>>>>>>>> y=16)
>>>>>>>>        at libmpcodecs/vf_screenshot.c:64
>>>>>>>> #6  0x0000555555826021 in draw_slice (s=<optimized out>, src=<optimized
>>>>>>>> out>, offset=<optimized out>, y=<optimized out>, type=<optimized out>,
>>>>>>>>        height=<optimized out>) at libmpcodecs/vd_ffmpeg.c:588
>>>>>>>> #7  0x0000555555eb48e4 in ff_draw_horiz_band (avctx=0x5555570f69a0,
>>>>>>>>        cur=<optimized out>, last=<optimized out>, y=16, h=16,
>>>>>>>>        picture_structure=3, first_field=0, low_delay=0)
>>>>>>>>        at libavcodec/mpegutils.c:77
>>>>>>>> #8  0x0000555555b95135 in ff_mpeg_draw_horiz_band
>>>>>>>> (s=s at entry=0x5555570f6e40, y=<optimized out>, h=<optimized out>) at
>>>>>>>> libavcodec/mpegvideo.c:2720 #9  0x0000555555b60db5 in mpeg_decode_slice
>>>>>>>> (s=s at entry=0x5555570f6e40, mb_y=mb_y at entry=1,
>>>>>>>> buf=buf at entry=0x7fffffffcdd8, buf_size=buf_size at entry=2077) at
>>>>>>>> libavcodec/mpeg12dec.c:1927 #10 0x0000555555b63b35 in decode_chunks
>>>>>>>> (avctx=avctx at entry=0x5555570f69a0,
>>>>>>>> picture=picture at entry=0x5555570f6760,
>>>>>>>> got_output=got_output at entry=0x7fffffffcf60, buf=0x555556f088c0 "",
>>>>>>>> buf_size=2111) at libavcodec/mpeg12dec.c:2759 #11 0x0000555555b645ab in
>>>>>>>> mpeg_decode_frame (avctx=0x5555570f69a0, data=0x5555570f6760,
>>>>>>>> got_output=0x7fffffffcf60, avpkt=<optimized out>) at
>>>>>>>> libavcodec/mpeg12dec.c:2836 #12 0x0000555555c6762e in
>>>>>>>> avcodec_decode_video2 (avctx=0x5555570f69a0, picture=0x5555570f6760,
>>>>>>>> got_picture_ptr=0x7fffffffcf60, avpkt=0x7fffffffcf90) at
>>>>>>>> libavcodec/utils.c:2096 ---Type <return> to continue, or q <return> to
>>>>>>>> quit--- #13 0x0000555555826e5f in decode (sh=0x555556edc410,
>>>>>>>> data=0x1000, len=1460848104, flags=-12400) at
>>>>>>>> libmpcodecs/vd_ffmpeg.c:949 #14 0x0000555555775f4f in decode_video
>>>>>>>> (sh_video=0x555556edc410, start=0x555556f088c0 "", in_size=2111,
>>>>>>>> drop_frame=0, pts=1.083922266960144, full_frame=0x7fffffffd0b0)
>>>>>>>>        at libmpcodecs/dec_video.c:398
>>>>>>>> #15 0x00005555556dd772 in update_video (blit_frame=0x7fffffffd158)
>>>>>>>>        at mplayer.c:2484
>>>>>>>> #16 0x00005555556d0980 in main (argc=5, argv=0x7fffffffe288) at
>>>>>>>> mplayer.c:3811
>>>>>>>>
>>>>>>>>
>>>>>>>> You're probably right with the commit that broke it, I'm checking if
>>>>>>>> swscale needs to be called differently now.
>>>>>>>>
>>>>>>>>
>>>>>>> May be a problem in ffmpeg, see https://trac.ffmpeg.org/ticket/4850
>>>>>>>
>>>>>>> I can get a crash with similar backtrace with
>>>>>>> ffmpeg -i mpeg_crash_screenshot.mpg -dsth 1096 -c png -f null /dev/null
>>>>>>>
>>>>>>>
>>>>>>> Program received signal SIGSEGV, Segmentation fault.
>>>>>>> 0x0000000000de5a57 in yuv2rgb_write (hasAlpha=0,
>>>>>>> target=AV_PIX_FMT_RGB24,
>>>>>>>        y=1088, _b=0x1e0f266, _g=0x1e0f266, _r=0x1e0f266, A2=0, A1=0,
>>>>>>>        Y2=<optimized out>, Y1=<optimized out>, i=<optimized out>,
>>>>>>>        _dest=0x7fffcc7f8040 "") at libswscale/output.c:1246
>>>>>>> 1246	        dest[i * 6 + 0] = r_b[Y1];
>>>>>>> (gdb) bt
>>>>>>> #0  0x0000000000de5a57 in yuv2rgb_write (hasAlpha=0,
>>>>>>> target=AV_PIX_FMT_RGB24,
>>>>>>>        y=1088, _b=0x1e0f266, _g=0x1e0f266, _r=0x1e0f266, A2=0, A1=0,
>>>>>>>        Y2=<optimized out>, Y1=<optimized out>, i=<optimized out>,
>>>>>>>        _dest=0x7fffcc7f8040 "") at libswscale/output.c:1246
>>>>>>> #1  yuv2rgb_X_c_template (hasAlpha=0, target=AV_PIX_FMT_RGB24, y=1088,
>>>>>>>        dstW=1920, dest=0x7fffcc7f8040 "", alpSrc=0x0, chrFilterSize=4,
>>>>>>>        chrVSrc=0x1b4dd30, chrUSrc=0x1b44c70, chrFilter=0x1b6e0c0,
>>>>>>>        lumFilterSize=4, lumSrc=0x1b4e4f8, lumFilter=0x1b67440,
>>>>>>> c=<optimized out>)
>>>>>>>        at libswscale/output.c:1370
>>>>>>> #2  yuv2rgb24_X_c (c=0x1ba75c0, lumFilter=0x1b67440, lumSrc=0x1b4e4f8,
>>>>>>>        lumFilterSize=4, chrFilter=0x1b6e0c0, chrUSrc=0x1b44c70,
>>>>>>>        chrVSrc=0x1b4dd30, chrFilterSize=4, alpSrc=0x0, dest=0x7fffcc7f8040
>>>>>>> "",
>>>>>>>        dstW=1920, y=1088) at libswscale/output.c:1515
>>>>>>> #3  0x0000000000dca58e in packed_vscale (c=<optimized out>,
>>>>>>>        desc=<optimized out>, sliceY=1088, sliceH=<optimized out>)
>>>>>>>        at libswscale/vscale.c:129
>>>>>>> #4  0x0000000000dc5d31 in swscale (c=0x1b4e980, src=0x1e0f266,
>>>>>>> srcStride=0x0,
>>>>>>>        srcSliceY=28632888, srcSliceH=28632848, dst=0x1b44c70,
>>>>>>>        dstStride=0x7fffffffd6f0) at libswscale/swscale.c:682
>>>>>>> #5  0x0000000000dc70ba in sws_scale (c=0x1b4e980,
>>>>>>> srcSlice=0x7fffffffd700,
>>>>>>>        srcStride=0x1b4e4f8, srcSliceY=4, srcSliceH=28762304,
>>>>>>> dst=0x7fffffffd720,
>>>>>>>        dstStride=0x7fffffffd7d0) at libswscale/swscale.c:1263
>>>>>>> #6  0x000000000050a088 in scale_slice (y=<optimized out>,
>>>>>>>        link=<optimized out>, field=<optimized out>, mul=<optimized out>,
>>>>>>>        h=<optimized out>, sws=<optimized out>, cur_pic=<optimized out>,
>>>>>>>        out_buf=<optimized out>) at libavfilter/vf_scale.c:477
>>>>>>> #7  filter_frame (link=0x1b44520, in=0x1e0ecc0) at
>>>>>>> libavfilter/vf_scale.c:579
>>>>>>> #8  0x000000000049f1df in ff_filter_frame_framed (link=0x1b44520,
>>>>>>>        frame=0x1e0ecc0) at libavfilter/avfilter.c:1089
>>>>>>> #9  0x00000000004a1299 in ff_filter_frame (link=0x1b44520,
>>>>>>> frame=0x1e0ecc0)
>>>>>>>        at libavfilter/avfilter.c:1173
>>>>>>> #10 0x000000000049f1df in ff_filter_frame_framed (link=0x1b44b20,
>>>>>>>        frame=0x1e0ecc0) at libavfilter/avfilter.c:1089
>>>>>>> #11 0x00000000004a1299 in ff_filter_frame (link=0x1b44b20,
>>>>>>> frame=0x1e0ecc0)
>>>>>>>        at libavfilter/avfilter.c:1173
>>>>>>> #12 0x00000000004a53a2 in request_frame (link=0x1b44b20)
>>>>>>>        at libavfilter/buffersrc.c:378
>>>>>>> #13 0x00000000004a50d4 in av_buffersrc_add_frame_internal (
>>>>>>>        ctx=ctx at entry=0x1b455e0, frame=frame at entry=0x1cca620,
>>>>>>> flags=flags at entry=4)
>>>>>>>        at libavfilter/buffersrc.c:180
>>>>>>> #14 0x00000000004a55cd in av_buffersrc_add_frame_flags (ctx=0x1b455e0,
>>>>>>>        frame=frame at entry=0x1cca620, flags=flags at entry=4)
>>>>>>>        at libavfilter/buffersrc.c:105
>>>>>>> #15 0x0000000000487272 in decode_video (ist=0x1b3ca00, pkt=<optimized
>>>>>>> out>,
>>>>>>>        got_output=<optimized out>) at ffmpeg.c:2179
>>>>>>> #16 0x00000000004715d3 in process_input_packet (pkt=<optimized out>,
>>>>>>>        ist=<optimized out>) at ffmpeg.c:2327
>>>>>>> #17 process_input (file_index=<optimized out>) at ffmpeg.c:3833
>>>>>>> #18 transcode_step () at ffmpeg.c:3921
>>>>>>> #19 transcode () at ffmpeg.c:3974
>>>>>>> #20 main (argc=28559872, argv=0x7fffffffe010) at ffmpeg.c:4157
>>>>>>> (gdb)
>>>>>>>
>>>>>>>
>>>>>>> Seems that the problem is related to slices, in MPlayer it works for the
>>>>>>> first slice but fails for the 2nd (slice height is 16; offset 0 is ok,
>>>>>>> offset 16 crashes).
>>>>>>>
>>>>>>>
>>>>>>> The attached workaroud fixes the crash, but produces a wrong picture;
>>>>>>> unless I missed some stupid detail, it should be equivalent to the old
>>>>>>> code.
>>>>>>>
>>>>>>>
>>>>>>> Ciao,
>>>>>>>     Roberto
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> MPlayer-users mailing list
>>>>>>> MPlayer-users at mplayerhq.hu
>>>>>>> https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users
>>>>>>>
>>>>>>
>>>>>> I compiled the latest MPlayer trunk/FFmpeg master that has a fix for
>>>>>> FFmpeg #4850 and without your patch.
>>>>>>
>>>>>> There is no crash but it simply quits (no screenshot saved) after
>>>>>> 'sending VFCTRL_SCREENSHOT!' when slices are enabled, with the exception
>>>>>> of mpeg_crash_ss_beetlejuice.mpg it quits slices or noslices.
>>>>> Fix for #4850 did not stop the crash for me too.
>>>>>
>>>>> What I found out is that if I force FFmpeg to use the old scaler
>>>>> filters, everything works fine.
>>>>>
>>>>> I was still unable to find out if something changed in the way you need
>>>>> to use swscaler (I don't think so), if there is a bug in the new
>>>>> swscaler, or if we always used it in the wrong way and we were just
>>>>> lucky up to now.
>>>>>
>>>>> I'm not much worried about vf_screenshot, but about all other uses of
>>>>> the scaler code in the mail player.
>>>>>
>>>>> If you want to test it, just comment out #define NEW_FILTER at the end
>>>>> of ffmpeg/libswscale/swscale_internal.h and recompile everything.
>>>>>
>>>>> This is a possible workaround for people using the internal ffmpeg copy
>>>>> of MPlayer, it will not help if you use a system-wide install of ffmpeg.
>>>>>
>>>>>
>>>>> Ciao,
>>>>>    Roberto
>>>>> _______________________________________________
>>>>> MPlayer-users mailing list
>>>>> MPlayer-users at mplayerhq.hu
>>>>> https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users
>>>>>
>>>>
>>>> As of current FFmpeg master with disabling the new filter everything
>>>> works fine so far.
>>> I found a way to produce a simple test case that fails in the exact way
>>> as MPlayer.
>>> See ffmpeg ticket https://trac.ffmpeg.org/ticket/4877
>>>
>> Crash is fixed with slices with latest ffmpeg, but image is wrong.
>> See https://trac.ffmpeg.org/ticket/4881
>>
>> The second sample still crashes with -noslices, but up to now I was
>> unable to create a simple test case to report it.
>>
> Fixed in FFmpeg git.
>
> The only problem remaining is the second sample with -noslices, it
> still crashes for me on Linux X86_64. I'll check if I can debug it
> in MPlayer, since I can't create a stand-alone testcase.
>
>
> Ciao,
>   Roberto
> _______________________________________________
> MPlayer-users mailing list
> MPlayer-users at mplayerhq.hu
> https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users
>

Much appreciation on fixing this issue so far. Thanks Roberto.


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