Recherche avancée

Sur d’autres sites (8072)

• ffmpeg progress is freezing frames when scene change

  19 août 2017, par Karol

  I’m capturing data from IP camera with RTSP protocol with ffmpeg with command :

  ffmpeg -rtsp_transport tcp -progress /media/kamip/stats.txt -i rtsp://192.168.1.220:554/live/h264/ch0 
  
  -c:v copy -c:a copy -strict 1 -map 0 -f segment -strftime 1 
  
  -segment_time 1800 /media/kamip/cam_%d_%m_%Y_%H_%M_%S.mkv

  I’m using this for 5 cameras. One is different type and it is in different location.
  Because ffmpeg does not support reconnect I’m writing status to /media/kamip/stats.txt file. In another script I’m parsing this output and every 30 seconds I’m checking if frame number changed, if yes - it is ok, if not, I’m restarting above command.

  The problem is only in the night. When is quite dark and suddenly lights on, for example when car is parking, the /media/kamip/stats.txt is showing the same frame number, so my script is recognizing this as a lost connection (video freeze)

  I tried "-strict 1" option and I think it is better (one false alarm per day instead of 10 per day), so I think this may be related to ffmpeg, not camera/video source, especially because the video is fine even frame number reported by ffmpeg is still the same. Also VLC does not have this kind of problem (but I cannot use it currently for this camera)

  I found that ffmpeg has build-in scene change detector, but it should works only when encoding video (I’m using "copy" option for audio and video) ?

  I’m thinking about different way of analyzing the video capturing, but this "-progress" in ffmpeg should works fine - and it is working fine for other cameras for few years).

  I also do not see any errors,
  when I encoded one cutted file with "-loglevel debug" I saw only information like below :

  [libx264 @ 0x25d77a0] scene cut at 174 Icost:2049115 Pcost:2006553 
  
  ratio:0.0208 bias:0.1387 gop:54 (imb:3186 pmb:168)

  ffmpeg in latest version

  ffmpeg version 3.3.3-1ubuntu1~16.04.york0 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609

  any help will be appreciated

• Remove support for building for mingw32ce (Windows CE)

  30 août 2017, par Martin Storsjö

  Remove support for building for mingw32ce (Windows CE)
  The toolchain for this target is unmaintained since many years.
  While it has been continuously build tested on fate, it hasn’t
  
  actually been tested at runtime since many, many years (and back
  
  then, only a few codecs in libavcodec were tested).
  So far, keeping support for it has been mostly effortless, but
  
  the compiler does seem to have issues with dllimported data symbols,
  
  ending up as internal compiler errors in some cases. Instead of
  
  jumping through further hoops to work around that, just remove the
  
  target.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] configure
  • [DBH] libavformat/os_support.h
  • [DBH] libavutil/file_open.c
  • [DBH] libavutil/wchar_filename.h
  • [DBH] tools/qt-faststart.c

• ffmpeg concat last image duration incorrect

  27 novembre 2019, par SIDU

  Here is my png.txt file :

  file '01.png'
  
  duration 92
  
  file '02.png'
  
  duration 46
  
  file '03.png'
  
  duration 67
  
  file '04.png'
  
  duration 62
  
  file '05.png'
  
  duration 57
  
  file '06.png'
  
  duration 3
  
  file '06.png'

  mp3 duration = 00:05:28 (total of above)

  And here is the line :

  ffmpeg -f concat -i png.txt -vsync vfr -i 20170817.mp3 -c:a aac -s 1280x720 -c:v libx264 -pix_fmt yuv420p -shortest 20170817.mp4

  And here is the output :

  ffmpeg version 3.3.2 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with Apple LLVM version 8.1.0 (clang-802.0.42)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.3.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
  
    libavutil      55. 58.100 / 55. 58.100
  
    libavcodec     57. 89.100 / 57. 89.100
  
    libavformat    57. 71.100 / 57. 71.100
  
    libavdevice    57.  6.100 / 57.  6.100
  
    libavfilter     6. 82.100 /  6. 82.100
  
    libavresample   3.  5.  0 /  3.  5.  0
  
    libswscale      4.  6.100 /  4.  6.100
  
    libswresample   2.  7.100 /  2.  7.100
  
    libpostproc    54.  5.100 / 54.  5.100
  
  Input #0, concat, from 'png.txt':
  
    Duration: 00:05:27.00, start: 0.000000, bitrate: 0 kb/s
  
      Stream #0:0: Video: png, rgba(pc), 1280x720 [SAR 2835:2835 DAR 16:9], 25 tbr, 25 tbn, 25 tbc
  
  Input #1, mp3, from '20170817.mp3':
  
    Metadata:
  
      encoder         : Lavf57.71.100
  
    Duration: 00:05:28.10, start: 0.069063, bitrate: 24 kb/s
  
      Stream #1:0: Audio: mp3, 16000 Hz, mono, s16p, 24 kb/s
  
  File '20170817.mp4' already exists. Overwrite ? [y/N] y
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
  
    Stream #1:0 -> #0:1 (mp3 (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 0x7fbe83003000] using SAR=1/1
  
  [libx264 @ 0x7fbe83003000] using cpu capabilities: MMX2 SSE2Fast SSSE3     SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x7fbe83003000] profile High, level 3.1
  
  [libx264 @ 0x7fbe83003000] 264 - core 148 r2748 97eaef2 - H.264/MPEG-4    AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to '20170817.mp4':
  
    Metadata:
  
      encoder         : Lavf57.71.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc57.89.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 16000 Hz, mono, fltp, 69 kb/s
  
      Metadata:
  
        encoder         : Lavc57.89.100 aac
  
  frame=    7 fps=4.2 q=-1.0 Lsize=    3349kB time=00:05:27.04 bitrate=  83.9kbits/s speed= 196x    
  
  video:465kB audio:2863kB subtitle:0kB other streams:0kB global    headers:0kB muxing overhead: 0.644585%
  
  [libx264 @ 0x7fbe83003000] frame I:1     Avg QP: 7.93  size:159157
  
  [libx264 @ 0x7fbe83003000] frame P:2     Avg QP:17.16  size: 61998
  
  [libx264 @ 0x7fbe83003000] frame B:4     Avg QP:18.34  size: 48049
  
  [libx264 @ 0x7fbe83003000] consecutive B-frames: 14.3% 28.6%  0.0% 57.1%
  
  [libx264 @ 0x7fbe83003000] mb I  I16..4: 48.6% 21.6% 29.8%
  
  [libx264 @ 0x7fbe83003000] mb P  I16..4:  4.4%  9.8% 19.7%  P16..4: 11.6%  3.0%  2.6%  0.0%  0.0%    skip:48.9%
  
  [libx264 @ 0x7fbe83003000] mb B  I16..4:  0.4%  0.5% 13.2%  B16..8: 14.9%  3.9%  2.6%  direct: 1.1%  skip:63.4%  L0:45.0% L1:52.1% BI: 3.0%
  
  [libx264 @ 0x7fbe83003000] 8x8 transform intra:19.2% inter:38.3%
  
  [libx264 @ 0x7fbe83003000] coded y,uvDC,uvAC intra: 52.3% 63.3% 62.4% inter: 8.6% 7.7% 6.9%
  
  [libx264 @ 0x7fbe83003000] i16 v,h,dc,p: 88%  9%  3%  0%
  
  [libx264 @ 0x7fbe83003000] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 12% 45%  2%  2%  3%  2%  3%  4%
  
  [libx264 @ 0x7fbe83003000] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 26% 18%  5%  5%  5%  5%  6%  6%
  
  [libx264 @ 0x7fbe83003000] i8c dc,h,v,p: 55% 18% 20%  8%
  
  [libx264 @ 0x7fbe83003000] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x7fbe83003000] ref P L0: 93.3%  0.3%  3.7%  2.8%
  
  [libx264 @ 0x7fbe83003000] ref B L0: 85.2% 14.8%
  
  [libx264 @ 0x7fbe83003000] ref B L1: 87.8% 12.2%
  
  [libx264 @ 0x7fbe83003000] kb/s:11.52
  
  [aac @ 0x7fbe83004800] Qavg: 1971.172

  The problem is that the mp4 has 00:06:45 duration, and the music finished at 00:05:28

  How do I chop the last silent bit off ?

  I tried the following :

  ffmpeg -ss 0 -i 20170817.mp4 -to 00:05:28 -c copy cut.mp4

  Which is worse. Adds blank silent video at front, and chop the video at middle which yet to finish.

  Please note the first 5 images are correct at right music positions, only last image duration error