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June 2018

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#7241(avcodec:new): DNxHD segfault on completion in dnxhd_encode_end when using 34 or more threads
by FFmpeg 03 Jun '18

03 Jun '18

#7241: DNxHD segfault on completion in dnxhd_encode_end when using 34 or more threads ---------------------------------+-------------------------------------- Reporter: gammie | Type: defect Status: new | Priority: normal Component: avcodec | Version: git-master Keywords: DNxHD | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | ---------------------------------+-------------------------------------- Summary of the bug: If you run an encode to DNxHD with 34 or more threads, you cause a segfault on attempting `av_freep(&ctx->thread[33])`. I believe this is related to #6592 and its solution 28e9ba951d1a0b0aca53b242aa64f484ca75e874 which are both associated with the addition of frame threading in the DNxHD encoder. I have reproduced this issue on today's git-master (04b570817b2b38e35675b17328239746212f4c3f) and n4.0. This issue does not occur in n3.0 where the encoder works fine with 48 threads. How to reproduce: {{{ ffmpeg -f lavfi -i testsrc=duration=1:size=1280x720:rate=60000/1001 -vcodec dnxhd -b:v 145M -pix_fmt yuv422p -threads 34 -f mxf /dev/null ffmpeg version N-91202-g04b5708 Copyright (c) 2000-2018 the FFmpeg developers built with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1) configuration: --enable-static --disable-shared --disable-ffplay --disable-doc --extra-cflags=-static --extra-libs='-lpng -lm -ldl -lpthread' --enable-gpl --enable-bzlib --enable-zlib --enable-postproc --enable-runtime-cpudetect --enable-libtheora --enable-libvorbis --enable- libmp3lame --enable-gray --enable-libfreetype --enable-libopenjpeg --enable-libspeex --enable-version3 --extra-ldflags=-static --pkg-config- flags=--static libavutil 56. 18.102 / 56. 18.102 libavcodec 58. 19.104 / 58. 19.104 libavformat 58. 17.100 / 58. 17.100 libavdevice 58. 4.100 / 58. 4.100 libavfilter 7. 24.100 / 7. 24.100 libswscale 5. 2.100 / 5. 2.100 libswresample 3. 2.100 / 3. 2.100 libpostproc 55. 2.100 / 55. 2.100 Input #0, lavfi, from 'testsrc=duration=1:size=1280x720:rate=60000/1001': Duration: N/A, start: 0.000000, bitrate: N/A Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 1280x720 [SAR 1:1 DAR 16:9], 59.94 tbr, 59.94 tbn, 59.94 tbc Stream mapping: Stream #0:0 -> #0:0 (rawvideo (native) -> dnxhd (native)) Press [q] to stop, [?] for help Output #0, mxf, to '/dev/null': Metadata: encoder : Lavf58.17.100 Stream #0:0: Video: dnxhd (DNXHD), yuv422p, 1280x720 [SAR 1:1 DAR 16:9], q=2-1024, 145000 kb/s, 59.94 fps, 59.94 tbn, 59.94 tbc Metadata: encoder : Lavc58.19.104 dnxhd [Parsed_testsrc_0 @ 0x4531f00] EOF timestamp not reliable frame= 60 fps= 57 q=1.0 Lsize= 17826kB time=00:00:01.00 bitrate=145885.1kbits/s speed=0.95x video:17760kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.371869% Segmentation fault }}} {{{ Program received signal SIGSEGV, Segmentation fault. 0x00000000012b0449 in free () (gdb) bt #0 0x00000000012b0449 in free () #1 0x0000000001095942 in av_free (ptr=<optimized out>) at libavutil/mem.c:223 #2 av_freep (arg=<optimized out>) at libavutil/mem.c:233 #3 0x0000000000421a71 in dnxhd_encode_end (avctx=0x2629bc0) at libavcodec/dnxhdenc.c:1373 #4 0x0000000000449740 in avcodec_close (avctx=avctx@entry=0x2629bc0) at libavcodec/utils.c:1077 #5 0x00000000009fd569 in avcodec_free_context (pavctx=0x26299e0) at libavcodec/options.c:178 #6 0x00000000004a42e0 in ffmpeg_cleanup (ret=0) at fftools/ffmpeg.c:571 #7 0x0000000000492f71 in exit_program (ret=0) at fftools/cmdutils.c:139 #8 0x0000000000484af8 in main (argc=<optimized out>, argv=0x7fffffffe598) at fftools/ffmpeg.c:4855 }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/7241> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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#5639(undetermined:new): dpx: support decoding of 12bit
by FFmpeg 01 Jun '18

01 Jun '18

#5639: dpx: support decoding of 12bit -------------------------------------+------------------------------------- Reporter: ami_stuff | Owner: Type: defect | Status: new Priority: normal | Component: Version: | undetermined unspecified | Keywords: Blocked By: | Blocking: Reproduced by developer: 0 | Analyzed by developer: 0 -------------------------------------+------------------------------------- also "10bit_a.dpx" seems to use gbrp10le and not gbrap10le? {{{ C:\>d:\ffmpeg -i C:\1\award\12bit.dpx ffmpeg version N-80270-gd4cd8e7 Copyright (c) 2000-2016 the FFmpeg developers built with gcc 4.5.0 (GCC) 20100414 (Fedora MinGW 4.5.0-1.fc14) configuration: --prefix=/var/www/users/research/ffmpeg/snapshots/build --arch= x86 --target-os=mingw32 --cross-prefix=i686-pc-mingw32- --cc='ccache i686 -pc-min gw32-gcc' --enable-pthreads --enable-memalign-hack --enable-runtime- cpudetect -- enable-cross-compile --enable-static --disable-shared --extra- libs='-lws2_32 -lw inmm -lpthread' --extra-cflags='--static -I/var/www/users/research/ffmpeg/snapsh ots/build/include' --extra-ldflags='-static -L/var/www/users/research/ffmpeg/sna pshots/build/lib' --enable-bzlib --enable-zlib --enable-gpl --enable- version3 -- enable-nonfree --enable-libx264 --enable-libspeex --enable-libtheora --enable-li bvorbis --enable-libfaac --enable-libxvid --enable-libopencore-amrnb --enable-li bopencore-amrwb --enable-libmp3lame --enable-libfreetype --enable-libvpx --disab le-decoder=libvpx libavutil 55. 24.100 / 55. 24.100 libavcodec 57. 46.100 / 57. 46.100 libavformat 57. 37.101 / 57. 37.101 libavdevice 57. 0.101 / 57. 0.101 libavfilter 6. 46.101 / 6. 46.101 libswscale 4. 1.100 / 4. 1.100 libswresample 2. 0.101 / 2. 0.101 libpostproc 54. 0.100 / 54. 0.100 [dpx @ 0x278f620] Packing to 16bit required [dpx_pipe @ 0x2782b00] decoding for stream 0 failed [dpx_pipe @ 0x2782b00] Could not find codec parameters for stream 0 (Video: dpx, none, 600x402): unspecified pixel format Consider increasing the value for the 'analyzeduration' and 'probesize' options Input #0, dpx_pipe, from 'C:\1\award\12bit.dpx': Duration: N/A, bitrate: N/A Stream #0:0: Video: dpx, none, 600x402, 25 tbr, 25 tbn, 25 tbc At least one output file must be specified }}} -- Ticket URL: <https://trac.ffmpeg.org/ticket/5639> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

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