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Autres articles (100)

  • List of compatible distributions

    26 avril 2011, par

    The table below is the list of Linux distributions compatible with the automated installation script of MediaSPIP. Distribution nameVersion nameVersion number Debian Squeeze 6.x.x Debian Weezy 7.x.x Debian Jessie 8.x.x Ubuntu The Precise Pangolin 12.04 LTS Ubuntu The Trusty Tahr 14.04
    If you want to help us improve this list, you can provide us access to a machine whose distribution is not mentioned above or send the necessary fixes to add (...)

  • Les autorisations surchargées par les plugins

    27 avril 2010, par

    Mediaspip core
    autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs

  • Activation de l’inscription des visiteurs

    12 avril 2011, par

    Il est également possible d’activer l’inscription des visiteurs ce qui permettra à tout un chacun d’ouvrir soit même un compte sur le canal en question dans le cadre de projets ouverts par exemple.
    Pour ce faire, il suffit d’aller dans l’espace de configuration du site en choisissant le sous menus "Gestion des utilisateurs". Le premier formulaire visible correspond à cette fonctionnalité.
    Par défaut, MediaSPIP a créé lors de son initialisation un élément de menu dans le menu du haut de la page menant (...)

Sur d’autres sites (8197)

  • how to use a video stream as input in python/opencv programme

    11 juillet 2016, par vasu gupta

    I am able to stream and receive webcam feed in two terminal via udp

    command for streaming :

    ffmpeg -i /dev/video0 -b 50k -r 20 -s 858x500 -f mpegts udp://127.0.0.1:2000  

    command for recieving :

    ffplay  udp://127.0.0.1:2000

    Now i have to use this received video stream as input in python/opencv how can i do that.
    I will be doing this using rtp and rstp as well.
    But in case of rtsp it is essential to initiate the receiving terminal, but if I do that then port will become busy and my program will not be able to take the feed.How could it be resolved.
    I am currently using opencv 2.4.13, python 2.7 in ubuntu 14.04

  • Using FFmpeg to encode 2pass mp4

    30 juin 2016, par Erin.Yang

    I am trying to use FFmpeg to encode my 4K mp4 file to a 2pass 265 mp4 file for the purposes of testing. I am new to video compression and hope I’m making a simple mistake that someone can correct.

    All infos in command line as below :

    C:\Ying\FF>C:\Ying\FF\ffmpeg.exe -y -i C:\Ying\FF\Xman-4K_50sec_3840x2160.mp4 -preset veryslow -x265-params pass=1 -vcodec hevc -b:v 15M -acodec libvo
    
_aacenc -b:a 128K C:\Ying\FF\Xman-4K_3840x2160_50sec_15M_H265_veryslow_2pass.mp4
    
ffmpeg version N-74286-ge5774f2 Copyright (c) 2000-2015 the FFmpeg developers
    
  built with gcc 4.9.3 (GCC)
    
  configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontco
    
nfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-l
    
ibfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-am
    
rwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-lib
    
twolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --en
    
able-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
    
  libavutil      54. 30.100 / 54. 30.100
    
  libavcodec     56. 57.100 / 56. 57.100
    
  libavformat    56. 40.101 / 56. 40.101
    
  libavdevice    56.  4.100 / 56.  4.100
    
  libavfilter     5. 32.100 /  5. 32.100
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  2.101 /  1.  2.101
    
  libpostproc    53.  3.100 / 53.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Ying\FF\Xman-4K_50sec_3840x2160.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    title           : X-MEN__DAYS_OF_FUTURE_PAST.Title800
    
    encoder         : Lavf56.40.101
    
  Duration: 00:00:50.01, start: 0.000000, bitrate: 11067 kb/s
    
    Chapter #0:0: start 0.000000, end 50.000000
    
    Metadata:
    
      title           : (26)01:17:27:726
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 3840x2160 [SAR 1:1 DAR 16:9], 11492 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (de
    
fault)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
    Stream #0:2(eng): Subtitle: mov_text (text / 0x74786574), 0 kb/s
    
    Metadata:
    
      handler_name    : SubtitleHandler
    
x265 [info]: HEVC encoder version 1.7
    
x265 [info]: build info [Windows][GCC 4.9.2][64 bit] 8bpp
    
x265 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
x265 [info]: Main profile, Level-5 (Main tier)
    
x265 [info]: Thread pool created using 32 threads
    
x265 [info]: frame threads / pool features       : 8 / wpp(34 rows)
    
x265 [info]: Coding QT: max CU size, min CU size : 64 / 8
    
x265 [info]: Residual QT: max TU size, max depth : 32 / 3 inter / 3 intra
    
x265 [info]: ME / range / subpel / merge         : dia / 57 / 2 / 1
    
x265 [info]: Keyframe min / max / scenecut       : 25 / 250 / 40
    
x265 [info]: Lookahead / bframes / badapt        : 40 / 8 / 2
    
x265 [info]: b-pyramid / weightp / weightb / refs: 1 / 1 / 1 / 1
    
x265 [info]: AQ: mode / str / qg-size / cu-tree  : 1 / 1.0 / 64 / 1
    
x265 [info]: Rate Control / qCompress            : ABR-15000 kbps / 0.60
    
x265 [info]: tools: rd=2 psy-rd=0.30 rdoq=2 psy-rdoq=1.00 early-skip signhide
    
x265 [info]: tools: tmvp b-intra fast-intra strong-intra-smoothing deblock sao
    
x265 [info]: tools: stats-write
    
Output #0, mp4, to 'C:\Ying\FF\Xman-4K_3840x2160_50sec_15M_H265_veryslow_2pass.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    title           : X-MEN__DAYS_OF_FUTURE_PAST.Title800
    
    encoder         : Lavf56.40.101
    
    Chapter #0:0: start 0.000000, end 50.000000
    
    Metadata:
    
      title           : (26)01:17:27:726
    
    Stream #0:0(und): Video: hevc (libx265) ([35][0][0][0] / 0x0023), yuv420p, 3840x2160 [SAR 1:1 DAR 16:9], q=2-31, 15000 kb/s, 30 fps, 15360 tbn, 30
    
 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
      encoder         : Lavc56.57.100 libx265
    
    Stream #0:1(und): Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, s16, 128 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
      encoder         : Lavc56.57.100 libvo_aacenc
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> hevc (libx265))
    
  Stream #0:1 -> #0:1 (aac (native) -> aac (libvo_aacenc))
    
Press [q] to stop, [?] for help
    
frame= 1502 fps=2.6 q=-0.0 Lsize=  100652kB time=00:00:50.01 bitrate=16485.9kbits/s dup=75 drop=0
    
video:99814kB audio:782kB subtitle:0kB other streams:0kB global headers:1kB muxing overhead: 0.054657%
    
x265 [info]: frame I:     11, Avg QP:13.26  kb/s: 59293.48
    
x265 [info]: frame P:    443, Avg QP:15.21  kb/s: 33977.10
    
x265 [info]: frame B:   1048, Avg QP:18.35  kb/s: 8420.64
    
x265 [info]: global :   1502, Avg QP:17.39  kb/s: 16330.84
    
x265 [info]: Weighted P-Frames: Y:4.5% UV:4.5%
    
x265 [info]: Weighted B-Frames: Y:1.9% UV:1.6%
    
x265 [info]: consecutive B-frames: 23.8% 11.9% 14.8% 22.9% 17.8% 7.0% 0.0% 0.0% 1.8%
    

    
C:\Ying\FF>C:\Ying\FF\ffmpeg.exe -y -i C:\Ying\FF\Xman-4K_50sec_3840x2160.mp4 -preset veryslow -x265-params pass=2 -vcodec hevc -b:v 15M -acodec libvo
    
_aacenc -b:a 128K C:\Ying\FF\Xman-4K_3840x2160_50sec_15M_H265_veryslow_2pass.mp4
    
ffmpeg version N-74286-ge5774f2 Copyright (c) 2000-2015 the FFmpeg developers
    
  built with gcc 4.9.3 (GCC)
    
  configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontco
    
nfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-l
    
ibfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-am
    
rwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-lib
    
twolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --en
    
able-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
    
  libavutil      54. 30.100 / 54. 30.100
    
  libavcodec     56. 57.100 / 56. 57.100
    
  libavformat    56. 40.101 / 56. 40.101
    
  libavdevice    56.  4.100 / 56.  4.100
    
  libavfilter     5. 32.100 /  5. 32.100
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  2.101 /  1.  2.101
    
  libpostproc    53.  3.100 / 53.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Ying\FF\Xman-4K_50sec_3840x2160.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    title           : X-MEN__DAYS_OF_FUTURE_PAST.Title800
    
    encoder         : Lavf56.40.101
    
  Duration: 00:00:50.01, start: 0.000000, bitrate: 11067 kb/s
    
    Chapter #0:0: start 0.000000, end 50.000000
    
    Metadata:
    
      title           : (26)01:17:27:726
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 3840x2160 [SAR 1:1 DAR 16:9], 11492 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (de
    
fault)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
    Stream #0:2(eng): Subtitle: mov_text (text / 0x74786574), 0 kb/s
    
    Metadata:
    
      handler_name    : SubtitleHandler
    
x265 [info]: HEVC encoder version 1.7
    
x265 [info]: build info [Windows][GCC 4.9.2][64 bit] 8bpp
    
x265 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
x265 [info]: Main profile, Level-6 (Main tier)
    
x265 [info]: Thread pool created using 32 threads
    
x265 [info]: frame threads / pool features       : 8 / wpp(34 rows)
    
x265 [error]: statistics are damaged at line 1495, parser out=1
    
[libx265 @ 0000000001e97d00] Cannot open libx265 encoder.
    
Output #0, mp4, to 'C:\Ying\FF\Xman-4K_3840x2160_50sec_15M_H265_veryslow_2pass.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    title           : X-MEN__DAYS_OF_FUTURE_PAST.Title800
    
    encoder         : Lavf56.40.101
    
    Chapter #0:0: start 0.000000, end 50.000000
    
    Metadata:
    
      title           : (26)01:17:27:726
    
    Stream #0:0(und): Video: hevc, none, q=2-31, 128 kb/s, SAR 1:1 DAR 0:0, 30 fps (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
      encoder         : Lavc56.57.100 libx265
    
    Stream #0:1(und): Audio: aac, 0 channels, 128 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
      encoder         : Lavc56.57.100 libvo_aacenc
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> hevc (libx265))
    
  Stream #0:1 -> #0:1 (aac (native) -> aac (libvo_aacenc))
    
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

    MediaInfo :

    General
    
Complete name                            : E:\4K\2ndRound\Xman-4K_50sec_3840x2160.mp4.mp4
    
Format                                   : MPEG-4
    
Format profile                           : Base Media
    
Codec ID                                 : isom
    
File size                                : 66.0 MiB
    
Duration                                 : 50s 6ms
    
Overall bit rate                         : 11.1 Mbps
    
Movie name                               : X-MEN__DAYS_OF_FUTURE_PAST.Title800
    
Writing application                      : Lavf56.40.101
    

    
Video
    
ID                                       : 1
    
Format                                   : AVC
    
Format/Info                              : Advanced Video Codec
    
Format profile                           : High@L5.1
    
Format settings, CABAC                   : Yes
    
Format settings, ReFrames                : 4 frames
    
Codec ID                                 : avc1
    
Codec ID/Info                            : Advanced Video Coding
    
Duration                                 : 47s 567ms
    
Bit rate                                 : 11.5 Mbps
    
Width                                    : 3 840 pixels
    
Height                                   : 2 160 pixels
    
Display aspect ratio                     : 16:9
    
Frame rate mode                          : Constant
    
Frame rate                               : 30.000 fps
    
Color space                              : YUV
    
Chroma subsampling                       : 4:2:0
    
Bit depth                                : 8 bits
    
Scan type                                : Progressive
    
Bits/(Pixel*Frame)                       : 0.046
    
Stream size                              : 65.2 MiB (99%)
    

    
Audio
    
ID                                       : 2
    
Format                                   : AAC
    
Format/Info                              : Advanced Audio Codec
    
Format profile                           : LC
    
Codec ID                                 : 40
    
Duration                                 : 50s 6ms
    
Bit rate mode                            : Constant
    
Bit rate                                 : 128 Kbps
    
Channel(s)                               : 2 channels
    
Channel positions                        : Front: L R
    
Sampling rate                            : 48.0 KHz
    
Compression mode                         : Lossy
    
Stream size                              : 781 KiB (1%)
    

    
Menu #1
    
ID                                       : 3
    
Codec ID                                 : text
    
Duration                                 : 50s 0ms
    
Language                                 : English
    

    
Menu #2
    
00:00:00.000                             : (26)01:17:27:726
    

    
​

  • reading video mpegts stream from stdin using libavformat libavcodec

    1er février 2012, par D Starkweather

    I'm trying to read video frames from stdin using ffmpeg's libav* lib collection. Simply passing "pipe:0" or "pipe :" as the filename to avformat_open_input_file() in my program does not do the trick. (e.g. cat /dev/video0 | ./myprogram OR ./myprogram < /dev/video0 ; it also fails using file.avi in place of /dev/video0).

    Peeking into ffmpeg.c, I find the following bit of code using tcsetattr() to set the termios :

    struct termios tty;
    

    
if (tcgetattr (0, &amp;tty) == 0) {
    
oldtty = tty;
    
restore_tty = 1;
    
atexit(term_exit);
    

    
tty.c_iflag &amp;= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
    
                      |INLCR|IGNCR|ICRNL|IXON);
    
tty.c_oflag |= OPOST;
    
tty.c_lflag &amp;= ~(ECHO|ECHONL|ICANON|IEXTEN);
    
tty.c_cflag &amp;= ~(CSIZE|PARENB);
    
tty.c_cflag |= CS8;
    
tty.c_cc[VMIN] = 1;
    
tty.c_cc[VTIME] = 0;
    

    
tcsetattr (0, TCSANOW, &amp;tty);
    
}
    
signal(SIGQUIT, sigterm_handler); /* Quit (POSIX).  */
    
}
    

    
avformat_network_deinit();
    

    
signal(SIGINT , sigterm_handler); /* Interrupt (ANSI).    */
    
signal(SIGTERM, sigterm_handler); /* Termination (ANSI).  */
    
signal(SIGXCPU, sigterm_handler);

    However, when I try this, it appears to have no effect. What settings do I need in the termios struct to continuously read video frames in ?

    Currently, all i am able to do is call av_read_frames a few times (return code 0) before it usually either segfaults or hangs waiting. The buffer usually contains just a blank screen (all black). With any luck, the video buffer will contain the first video frame it comes across, but does not update to the later frames.

    (I'm running this on Debian 6.0) Here's my version of ffmpeg :

    ffmpeg version N-36936-g4cf81d9 Copyright (c) 2000-2012 the FFmpeg
    developers built on Jan 19 2012 20:51:47 with gcc 4.4.5
    configuration : —enable-shared —enable-gray —enable-hardcoded-tables
    —enable-runtime-cpudetect —enable-libmp3lame —enable-libopenjpeg —enable-librtmp —enable-libtheora —enable-libvorbis —enable-libx264 —enable-libxvid —enable-zlib —enable-gpl libavutil 51. 34.101 / 51. 34.101 libavcodec 53. 57.100 /
    53. 57.100 libavformat 53. 30.100 / 53. 30.100 libavdevice 53. 4.100 / 53. 4.100 libavfilter 2. 59.101 / 2. 59.101 libswscale 2. 1.100 / 2. 1.100 libswresample 0. 6.100 /
    0. 6.100 libpostproc 52. 0.100 / 52. 0.100 Hyper fast Audio and Video encoder usage : ffmpeg [options] [[infile options] -i
    infile].

    Thank you very much for any help helpful tips. It is much appreciated.

    D. Grant Starkweather

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