Ricezione di strani errori in ffmpeg durante la ricerca, "POC localizzati non disponibili", "mmco: unref short failure"

Question

Ho visto altre persone avere il problema ma non ho visto una soluzione. Se provo a cercare con ffmpeg ottengo degli errori e il video risultante si blocca in un fotogramma all'inizio prima di spostarsi. Anche se apro il video in VLC, non riesco a cercare il punto esatto in cui si verifica il problema. Sembra che il video sia danneggiato in qualche modo, ma funziona bene, può essere riparato?

Se cambio il formato del contenitore dell'input da ts a mp4, l'errore non si verifica ma al posto del frame congelato ho uno schermo nero.

Comando e output completi:

$ ffmpeg -ss 5.5 -i video.ts -to 10 -avoid_negative_ts make_zero -vcodec libx264 -crf 23 -acodec copy output.ts

ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
  built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3_1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
Input #0, mpegts, from 'video.ts':
  Duration: 00:32:50.07, start: 1.407811, bitrate: 2227 kb/s
  Program 1 
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
    Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 117 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[h264 @ 0x7fa933003c00] co located POCs unavailable
[h264 @ 0x7fa933001800] mmco: unref short failure
[h264 @ 0x7fa931800000] co located POCs unavailable
[h264 @ 0x7fa933003c00] mmco: unref short failure
[libx264 @ 0x7fa932801000] using SAR=1/1
[libx264 @ 0x7fa932801000] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x7fa932801000] profile High, level 3.1
Output #0, mpegts, to 'output.ts':
  Metadata:
    encoder         : Lavf58.20.100
    Stream #0:0: Video: h264 (libx264), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 90k tbn, 25 tbc
    Metadata:
      encoder         : Lavc58.35.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 117 kb/s
frame=  236 fps= 38 q=-1.0 Lsize=    2974kB time=00:00:09.98 bitrate=2439.3kbits/s speed=1.62x    
video:2559kB audio:165kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 9.200110%
[libx264 @ 0x7fa932801000] frame I:4     Avg QP:20.49  size: 56038
[libx264 @ 0x7fa932801000] frame P:115   Avg QP:22.34  size: 15286
[libx264 @ 0x7fa932801000] frame B:117   Avg QP:24.56  size:  5452
[libx264 @ 0x7fa932801000] consecutive B-frames: 18.2% 44.1%  8.9% 28.8%
[libx264 @ 0x7fa932801000] mb I  I16..4: 26.5% 32.9% 40.6%
[libx264 @ 0x7fa932801000] mb P  I16..4:  7.4% 12.8%  3.4%  P16..4: 30.6%  8.0%  4.0%  0.0%  0.0%    skip:33.8%
[libx264 @ 0x7fa932801000] mb B  I16..4:  1.5%  2.3%  1.1%  B16..8: 20.9%  4.1%  0.6%  direct: 3.1%  skip:66.4%  L0:38.0% L1:58.6% BI: 3.4%
[libx264 @ 0x7fa932801000] 8x8 transform intra:50.8% inter:63.0%
[libx264 @ 0x7fa932801000] coded y,uvDC,uvAC intra: 40.3% 71.6% 31.3% inter: 9.5% 21.8% 1.4%
[libx264 @ 0x7fa932801000] i16 v,h,dc,p: 42% 35% 15%  8%
[libx264 @ 0x7fa932801000] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 25% 27%  4%  3%  3%  5%  3%  6%
[libx264 @ 0x7fa932801000] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 27% 15%  6%  6%  5%  7%  5%  6%
[libx264 @ 0x7fa932801000] i8c dc,h,v,p: 42% 28% 22%  8%
[libx264 @ 0x7fa932801000] Weighted P-Frames: Y:4.3% UV:4.3%
[libx264 @ 0x7fa932801000] ref P L0: 74.0% 13.6%  9.5%  2.9%  0.1%
[libx264 @ 0x7fa932801000] ref B L0: 85.0% 13.2%  1.8%
[libx264 @ 0x7fa932801000] ref B L1: 98.3%  1.7%
[libx264 @ 0x7fa932801000] kb/s:2220.26

Answer 1

Risolto ... prima:

ffmpeg -i video.ts -c copy video.mp4

e poi invece di:

ffmpeg -ss 5.5 -i video.mp4 -to 10 -avoid_negative_ts make_zero -vcodec libx264 -crf 23 -acodec copy output.ts

tu fai:

ffmpeg -ss 5.5 -i video.mp4 -ss 0 -to 10 -avoid_negative_ts make_zero -vcodec libx264 -crf 23 -acodec copy output.ts