On Mon, Jun 3, 2024 at 7:19 PM Mark Filipak <markfilipak.i...@gmail.com> wrote:
> With something a complicated as this stuff, I knew I would screw up > something. Correction: I fixed > the 'Commands used'. > > > Hey, > > My cuts are perfect, true IDR. The join is perfect, yet MPV stalls for > about 1/2 second and shows > one, maybe two black frames. The only thing I can think of that would > screw up the playing across my > joins is MPEG's 'closed_gop' flag. It needs to set it to '1' for the GOP > on the early side of the join. > > I know that FFmpeg doesn't fix 'closed_gop' when it does '-ss' and '-to' > on VOBs, so I assume it > doesn't fix 'closed_gop' for M2TSes either. Just for clarity, I'm not > using '-ss' and '-to'. I'm > doing stream editing instead -- see the end matter, below. > > Is there a way to set 'closed_gop' in FFmpeg? > Is there a way to set 'closed_gop' for an individual GOP? > > Aside: I'm pretty sure this has something to do with '-ss' and '-to' > sometimes failing to make > segments that join properly. '-ss' and '-to' need to fiddle with the > 'closed_gop' & 'broken_link' > MPEG tags. > > Thanks! > --Mark. > > > Commands used: > > ffmpeg -copyts -i SOURCE_1 -map 0 -bsf > noise=drop='lt(pts\,<I1_PTS>)+gte(dts\,<B_DTS>)',setts=dts='if(eq(DTS\,<I1_DTS>)\,<I1_PTS>-<1_frame>\,DTS)':pts='if(eq(PTS\,<I2_PTS>)\,<B_DTS>\,PTS)' > > -c copy -muxdelay 0 SEGMENT_1 > > ffmpeg -copyts -i SOURCE_2 -map 0 -bsf > noise=drop='lt(pts\,<I1_PTS>)+gte(dts\,<B_DTS>)',setts=dts='if(eq(DTS\,<I1_DTS>)\,<I1_PTS>-<1_frame>+<OFFSET>\,DTS+<OFFSET>)':pts='if(eq(PTS\,<I2_PTS>+<OFFSET>)\,<B_DTS>+<OFFSET>\,PTS+<OFFSET>)' > > -c copy -muxdelay 0 SEGMENT_2 > > ffmpeg -copyts -i "concat:SEGMENT_1|SEGMENT_2" -map 0 -c copy -muxdelay 0 > TARGET > > (Paul, I don't think concat is a problem. I think this stuff, here, is the > problem.) > > Step 1: Make IDR cuts > SEGMENT_1 -- imagine i want just just one gop having only 6 frames > (source is all open GOPs) > I1_PTS I2_PTS > \<———6 frames———> / > PTS order .. B B P B B I B B P B B I B B P .. > _¦__¦_/ _¦__¦_/ _¦__¦_/ _¦__¦_/ _¦__¦_/ > / ¦ ¦ / ¦ ¦ / ¦ ¦ / ¦ ¦ / ¦ ¦ > DTS order .. P B B I B B P B B I B B P B B .. > \ \ > I1_DTS B_DTS > > CUT pts < I1_PTS <———6 frames———> > CUT dts >= B_DTS I B B P B I > ______/ _¦__¦_/ _¦____/ > / / ¦ ¦ / ¦ > I P B B I B > > Note: If there was just one open B-frame, now there are no open B-frames. > In that case (my case), > the 6 frames are now a closed GOP and must be marked 'closed_gop = 1', but > how do I do that? > > .-------------------------WHAT IS CUT--------------------------. > ¦ <———6 frames———> ¦ > ¦ .. B B P B B B B B P .. ¦ > ¦ _¦__¦_/ ¦ ¦ ¦ _¦__¦_/ ¦ > ¦ / ¦ ¦ ¦ ¦ ¦ / ¦ ¦ ¦ > ¦ .. P B B B B B P B B .. ¦ > '--------------------------------------------------------------' > > ADJUST DTS & PTS <———6 frames———> > I B B P B I<—— > / _¦__¦_/ _¦_/ > / / ¦ ¦ / ¦ > —————>I P B B I B > > (The ending I-frame has replaced the final open B-frame -- preserves N & > sync.) > > > Step 2: Do the same and add OFFSET <———6 frames———> > SEGMENT_2 I B B P B I > / _¦__¦_/ _¦_/ > / / ¦ ¦ / ¦ > I P B B I B > > > Step 3: Concatenate <———6 frames———> <———6 frames———> > I B B P B I I B B P B I > / _¦__¦_/ _¦_/ / _¦__¦_/ _¦_/ > / / ¦ ¦ / ¦ / / ¦ ¦ / ¦ > I P B B I B I P B B I B > > > ffmpeg -copyts -i "concat:SEGMENT_1|SEGMENT_2" -map 0 -c copy -muxdelay 0 > TARGET > > ffmpeg version 2024-05-20-git-127ded5078-full_build-www.gyan.dev > Copyright (c) 2000-2024 the FFmpeg > developers > built with gcc 13.2.0 (Rev5, Built by MSYS2 project) > configuration: --enable-gpl --enable-version3 --enable-static > --disable-w32threads > --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls > --enable-libxml2 > --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib > --enable-librist > --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth > --enable-libbluray > --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption > --enable-libdav1d > --enable-libdavs2 --enable-libuavs3d --enable-libxevd --enable-libzvbi > --enable-librav1e > --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 > --enable-libxavs2 > --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl > --enable-libopenjpeg > --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r > --enable-libfreetype > --enable-libfribidi --enable-libharfbuzz --enable-liblensfun > --enable-libvidstab --enable-libvmaf > --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid > --enable-dxva2 --enable-d3d11va > --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec > --enable-nvenc --enable-vaapi > --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl > --enable-libcdio > --enable-libgme --enable-libmodplug --enable-libopenmpt > --enable-libopencore-amrwb > --enable-libmp3lame --enable-libshine --enable-libtheora > --enable-libtwolame --enable-libvo-amrwbenc > --enable-libcodec2 --enable-libilbc --enable-libgsm > --enable-libopencore-amrnb --enable-libopus > --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b > --enable-libflite > --enable-libmysofa --enable-librubberband --enable-libsoxr > --enable-chromaprint > libavutil 59. 19.100 / 59. 19.100 > libavcodec 61. 5.104 / 61. 5.104 > libavformat 61. 3.103 / 61. 3.103 > libavdevice 61. 2.100 / 61. 2.100 > libavfilter 10. 2.102 / 10. 2.102 > libswscale 8. 2.100 / 8. 2.100 > libswresample 5. 2.100 / 5. 2.100 > libpostproc 58. 2.100 / 58. 2.100 > Input #0, mpegts, from 'concat:SEGMENT_1|SEGMENT_2': > Duration: 02:47:54.15, start: 31.712367, bitrate: 20859 kb/s > Program 1 > Metadata: > service_name : Service01 > service_provider: FFmpeg > Stream #0:0[0x1011]: Video: h264 (High) ([27][0][0][0] / 0x001B), > yuv420p(progressive), 1920x1080 > [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn > Stream #0:1[0x1100]: Audio: dts (dca) (DTS-HD MA) ([130][0][0][0] / > 0x0082), 48000 Hz, mono, s32p > (24 bit) > Stream mapping: > Stream #0:0 -> #0:0 (copy) > Stream #0:1 -> #0:1 (copy) > Output #0, mpegts, to 'TARGET': > Metadata: > encoder : Lavf61.3.103 > Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), > yuv420p(progressive), 1920x1080 [SAR > 1:1 DAR 16:9], q=2-31, 23.98 fps, 23.98 tbr, 90k tbn > Stream #0:1: Audio: dts (DTS-HD MA) ([130][0][0][0] / 0x0082), 48000 > Hz, mono, s32p (24 bit) > [mpegts @ 00000000003c2c80] Packet corrupt (stream = 0, dts = NOPTS). > [out#0/mpegts @ 00000000004a7400] video:23082127KiB audio:1345500KiB > subtitle:0KiB other > streams:0KiB global headers:0KiB muxing overhead: 5.013221% > size=25652238KiB time=02:47:48.97 > bitrate=20870.4kbits/s speed=5.47x > > > Note the line: "[mpegts @ 00000000003c2c80] Packet corrupt (stream = 0, > dts = NOPTS)." > Which packet? What PTS? > > Last Thought: Video is Legos. > Not possible, use something more efficient, less buggy and far more useful tooling. > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
