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• Stream video from python code(ffmpeg)

  31 janvier 2018, par R-Cronj

  I have video frames from below code

  (grabbed, frame) = camera.read()

  Now I want to stream this live video from my python code.

  I plan on using ffmpeg but please do tell me if I can do this with another tool.

  I have tried this but didn’t work :

  subprocess.call(["ffmpeg", "-f", "rawvideo", "-pixel_format", "bgr24", "-video_size", "544x576", "-framerate", "25", "-i", "-", "http://localhost:8090/feed1.ffm"], stdin=frame.tostring())

• Anomalie #3260 (Nouveau) : Problème de dump sur les tables comportants des index de longueur spéci...

  28 août 2014, par b b

  Le contexte est le suivant : http://contrib.spip.net/GIS-4?debut_comments-list=@476655#forum476655

  En résumé, depuis que la table spip_gis contient des index dont la longueur est spécifiée, le système de dump génère une erreur sur ces tables. Après pas mal de recherche, je suis remonté jusqu’à spip_mysql_show_table() (raison pour laquelle ce ticket est déclaré sur le core et non le plugin dump).

  J’ai d’abord étudié ce qui se passe dans base_copier_table() de ecrire/base/dump.php :

  http://core.spip.org/projects/spip/repository/entry/spip/ecrire/base/dump.php#L536

  À ce niveau, dans $desc_source['key'] la longueur des index n’est pas renseignée. Si on compare le contenu des fichiers de cache des descriptions des tables, on observe que tmp/cache/sql_desc*.txt ne renseigne pas la longueur des index. Alors que tmp/cachesql_desc_dump*.txt est ok, la longueur des index y est présente.

  Du coup, j’en suis remonté à sql_showtable(), et plus précisemment à spip_mysql_show_table() :

  http://core.spip.org/projects/spip/repository/entry/spip/ecrire/req/mysql.php#L754

  Depuis phpmyadmin, un SHOW CREATE TABLE renvoie bien ce qu’il faut, ex :

  CREATE TABLE `spip_gis` (
   `id_gis` bigint(21) NOT NULL AUTO_INCREMENT,
   `titre` text NOT NULL,
   `descriptif` text NOT NULL,
   `lat` double DEFAULT NULL,
   `lon` double DEFAULT NULL,
   `zoom` tinyint(4) DEFAULT NULL,
   `adresse` text NOT NULL,
   `pays` text NOT NULL,
   `code_pays` varchar(255) NOT NULL DEFAULT ’’,
   `region` text NOT NULL,
   `departement` text NOT NULL,
   `ville` text NOT NULL,
   `code_postal` varchar(255) NOT NULL DEFAULT ’’,
   PRIMARY KEY (`id_gis`),
   KEY `lat` (`lat`),
   KEY `lon` (`lon`),
   KEY `pays` (`pays`(500)),
   KEY `code_pays` (`code_pays`),
   KEY `region` (`region`(500)),
   KEY `ville` (`ville`(500)),
   KEY `code_postal` (`code_postal`),
   KEY `departement` (`departement`(500))
  ) ENGINE=MyISAM AUTO_INCREMENT=24 DEFAULT CHARSET=latin1
  

  Il semble que la regex de la ligne 736 ne match pas la table spip_gis certainement à cause des (500) :

  http://core.spip.org/projects/spip/repository/entry/spip/ecrire/req/mysql.php#L736

  Et du coup, on bascule sur le plan B, qui ne fait qu’un simple SHOW COLUMNS FROM ne contenant pas l’information de longueur des index :

  http://core.spip.org/projects/spip/repository/entry/spip/ecrire/req/mysql.php#L765

  Wala où j’en suis ^^ Je ne sais pas si ce comportement est voulu, mais il pose un sacré problème pour les dumps.

• Hikvision NVR video conversion ffmpeg

  6 août 2024, par astralmaster

  I have a Hikvision NVR that stores security camera footage that I need to display on a website. I know that Hikvision uses proprietary H.264 codec that makes it impossible to play (coherently) in popular video players, like VLC, unless you install that codec everywhere you play it.

  



  My plan was to transcode the video using ffmpeg to regular H.264 codec and AAC for audio but the produced file has the same issues as the original - no audio when playing and very disruptive video. 
So the question is, does ffmpeg support encoding from Hikvision video/audio codecs ? Or perhaps should try to convert to different web-capable codecs using ffmpeg ?
My ffmpeg command looks like this :

  



  ffmpeg -i C:\1.mp4  -c:v libx264 -preset fast -crf 30 -b:v 200k -c:a aac -strict experimental -movflags faststart -threads 0 C:\2.mp4


  



  EDIT : What's interesting is that ffplay.exe opens and plays the original video files with no problem whatsoever, even on a computer where Hikvision codecs are not isntalled, therefore I figured conversion should be possible as well ?

  



  Mediainfo output of the video file in question :

  



  General
CompleteName                     : C:\DownLoad\1.mp4
Format                           : MPEG-PS
FileSize/String                  : 8.60 MiB
Duration/String                  : 2 h 7 min
OverallBitRate/String            : 9 395 b/s
FileExtension_Invalid            : mpeg mpg m2p vob pss evo

Video
ID/String                        : 224 (0xE0)
Format                           : AVC
Format/Info                      : Advanced Video Codec
Format_Profile                   : Baseline@L4
Format_Settings                  : 1 Ref Frames
Format_Settings_CABAC/String     : No
Format_Settings_RefFrames/String : 1 frame
Format_Settings_GOP              : M=1, N=30
Duration/String                  : 2 min 0 s
Width/String                     : 1 920 pixels
Height/String                    : 1 080 pixels
DisplayAspectRatio/String        : 16:9
FrameRate_Mode/String            : Variable
ColorSpace                       : YUV
ChromaSubsampling/String         : 4:2:0
BitDepth/String                  : 8 bits
ScanType/String                  : Progressive

Audio
ID/String                        : 192 (0xC0)
Format                           : MPEG Audio
Duration/String                  : 2 h 7 min
Compression_Mode/String          : Lossy
Video_Delay/String               : -33 min 40 s


  



  Output of ffmpeg :

  



  C:\ffmpeg\bin>ffmpeg -i C:\DownLoad\1.mp4  -c:v libx264 -preset fast -crf 30 -b:v 75k -c:a aac -strict experimental -movflags faststart -threads 0 C:\DownLoad\2.mp4
ffmpeg version N-86537-gae6f6d4 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 7.1.0 (GCC)
  configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  libavutil      55. 66.100 / 55. 66.100
  libavcodec     57. 99.100 / 57. 99.100
  libavformat    57. 73.100 / 57. 73.100
  libavdevice    57.  7.100 / 57.  7.100
  libavfilter     6. 94.100 /  6. 94.100
  libswscale      4.  7.101 /  4.  7.101
  libswresample   2.  8.100 /  2.  8.100
  libpostproc    54.  6.100 / 54.  6.100
Input #0, mpeg, from 'C:\DownLoad\1.mp4':
  Duration: 02:07:57.93, start: 789.820800, bitrate: 9 kb/s
    Stream #0:0[0x1e0]: Video: h264 (Baseline), yuv420p(progressive), 1920x1080, 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x1c0]: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s
File 'C:\DownLoad\2.mp4' already exists. Overwrite ? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (pcm_mulaw (native) -> aac (native))
Press [q] to stop, [?] for help
[aac @ 0000000002cd0280] Too many bits 8832.000000 > 6144 per frame requested, clamping to max
[libx264 @ 0000000002514c80] using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX XOP FMA4
[libx264 @ 0000000002514c80] profile High, level 4.0
[libx264 @ 0000000002514c80] 264 - core 150 r2833 df79067 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=6 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=12 lookahead_threads=2 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=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=30 rc=crf mbtree=1 crf=30.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'C:\DownLoad\2.mp4':
  Metadata:
    encoder         : Lavf57.73.100
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080, q=-1--1, 75 kb/s, 25 fps, 12800 tbn, 25 tbc
    Metadata:
      encoder         : Lavc57.99.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/75000 buffer size: 0 vbv_delay: -1
    Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 8000 Hz, mono, fltp, 48 kb/s
    Metadata:
      encoder         : Lavc57.99.100 aac
[mp4 @ 00000000010e9e00] Starting second pass: moving the moov atom to the beginning of the file speed= 116x
frame= 3269 fps= 66 q=-1.0 Lsize=   11086kB time=01:34:24.38 bitrate=  16.0kbits/s dup=269 drop=0 speed= 115x
video:10429kB audio:592kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.594114%
[libx264 @ 0000000002514c80] frame I:14    Avg QP:21.86  size: 59795
[libx264 @ 0000000002514c80] frame P:833   Avg QP:24.81  size:  8993
[libx264 @ 0000000002514c80] frame B:2422  Avg QP:28.70  size:   970
[libx264 @ 0000000002514c80] consecutive B-frames:  1.0%  0.2%  1.4% 97.4%
[libx264 @ 0000000002514c80] mb I  I16..4: 18.9% 66.3% 14.8%
[libx264 @ 0000000002514c80] mb P  I16..4:  4.0%  7.7%  0.4%  P16..4: 16.2%  2.0%  0.6%  0.0%  0.0%    skip:69.1%
[libx264 @ 0000000002514c80] mb B  I16..4:  0.6%  0.2%  0.0%  B16..8:  5.5%  0.1%  0.0%  direct: 0.7%  skip:92.9%  L0:44.0% L1:55.0% BI: 1.0%
[libx264 @ 0000000002514c80] 8x8 transform intra:59.0% inter:83.3%
[libx264 @ 0000000002514c80] coded y,uvDC,uvAC intra: 25.3% 36.1% 7.7% inter: 1.0% 2.3% 0.1%
[libx264 @ 0000000002514c80] i16 v,h,dc,p: 23% 24% 43% 10%
[libx264 @ 0000000002514c80] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 37% 26% 23%  2%  2%  3%  2%  3%  3%
[libx264 @ 0000000002514c80] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 43% 23% 12%  4%  4%  5%  4%  4%  2%
[libx264 @ 0000000002514c80] i8c dc,h,v,p: 81%  7%  9%  3%
[libx264 @ 0000000002514c80] Weighted P-Frames: Y:1.0% UV:0.0%
[libx264 @ 0000000002514c80] ref P L0: 73.6% 26.4%
[libx264 @ 0000000002514c80] ref B L0: 80.9% 19.1%
[libx264 @ 0000000002514c80] ref B L1: 90.0% 10.0%
[libx264 @ 0000000002514c80] kb/s:653.30
[aac @ 0000000002cd0280] Qavg: 64512.656

C:\ffmpeg\bin>


  



  Download link to sample :

  



  https://www.dropbox.com/s/9ccptsuiqk2ntsv/1.zip?dl=0

  



  This sample is exactly 2 minutes long, but VLC will tell you otherwise.