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  • MediaSPIP v0.2

    21 juin 2013, par

    MediaSPIP 0.2 est la première version de MediaSPIP stable.
    Sa date de sortie officielle est le 21 juin 2013 et est annoncée ici.
    Le fichier zip ici présent contient uniquement les sources de MediaSPIP en version standalone.
    Comme pour la version précédente, il est nécessaire d’installer manuellement l’ensemble des dépendances logicielles sur le serveur.
    Si vous souhaitez utiliser cette archive pour une installation en mode ferme, il vous faudra également procéder à d’autres modifications (...)

  • Mise à disposition des fichiers

    14 avril 2011, par

    Par défaut, lors de son initialisation, MediaSPIP ne permet pas aux visiteurs de télécharger les fichiers qu’ils soient originaux ou le résultat de leur transformation ou encodage. Il permet uniquement de les visualiser.
    Cependant, il est possible et facile d’autoriser les visiteurs à avoir accès à ces documents et ce sous différentes formes.
    Tout cela se passe dans la page de configuration du squelette. Il vous faut aller dans l’espace d’administration du canal, et choisir dans la navigation (...)

  • MediaSPIP version 0.1 Beta

    16 avril 2011, par

    MediaSPIP 0.1 beta est la première version de MediaSPIP décrétée comme "utilisable".
    Le fichier zip ici présent contient uniquement les sources de MediaSPIP en version standalone.
    Pour avoir une installation fonctionnelle, il est nécessaire d’installer manuellement l’ensemble des dépendances logicielles sur le serveur.
    Si vous souhaitez utiliser cette archive pour une installation en mode ferme, il vous faudra également procéder à d’autres modifications (...)

Sur d’autres sites (7056)

  • FFMPEG - Images to Video

    24 mars 2014, par Mahesh
    ffmpeg -f image2 -r 15 -i images/img%03d.jpg -vcodec libx264 video.mp4

    I run this code with exec in php.

    I am not getting the output. The video.mp4 is blank.

    However if i modify this commade to something like this,

    ffmpeg -f image2 -i i.jpg -vcodec libx264 -t 15 video.mp4

    The video is running for 15 seconds.

    I tried -r 1/15. It is not working too.
    Where do i do the mistake ?

    <?php
    $command = "/usr/bin/ffmpeg -f image2 -r 15 -i images/img%03d.jpg -vcodec libx264 video.mp4";
    exec($command);
    ?>

    images folder has img001.jpg img002.jpg ... img005.jpg

    Array
    (
    [0] => ffmpeg version N-48645-gf3c9d8d Copyright (c) 2000-2013 the FFmpeg developers
    [1] =>   built on Jan  9 2013 04:08:32 with gcc 4.7 (Debian 4.7.2-5)
    [2] =>   configuration: --extra-cflags=-I../static/include --extra-ldflags='-L../static/lib -static' --enable-gpl --enable-version3 --enable-static --disable-shared --disable-debug --enable-runtime-cpudetect --disable-x11grab --enable-libmp3lame --enable-libx264 --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libxavs --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --disable-ffserver
    [3] =>   libavutil      52. 13.100 / 52. 13.100
    [4] =>   libavcodec     54. 86.100 / 54. 86.100
    [5] =>   libavformat    54. 59.106 / 54. 59.106
    [6] =>   libavdevice    54.  3.102 / 54.  3.102
    [7] =>   libavfilter     3. 32.100 /  3. 32.100
    [8] =>   libswscale      2.  1.103 /  2.  1.103
    [9] =>   libswresample   0. 17.102 /  0. 17.102
    [10] =>   libpostproc    52.  2.100 / 52.  2.100
    [11] => Input #0, image2, from 'images/img%03d.jpg':
    [12] =>   Duration: 00:00:45.00, start: 0.000000, bitrate: N/A
    [13] =>     Stream #0:0: Video: mjpeg, yuvj420p, 200x300 [SAR 1:1 DAR 2:3], 0.07 fps, 0.33 tbr, 0.07 tbn, 0.07 tbc
    [14] => [libx264 @ 0x3283080] using SAR=1/1
    [15] => [libx264 @ 0x3283080] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX
    [16] => [libx264 @ 0x3283080] profile High, level 1.2
    [17] => [libx264 @ 0x3283080] 264 - core 129 r2230 1cffe9f - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - 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=1 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
    [18] => Output #0, mp4, to 'videos/video.mp4':
    [19] =>   Metadata:
    [20] =>     encoder         : Lavf54.59.106
    [21] =>     Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuvj420p, 200x300 [SAR 1:1 DAR 2:3], q=-1--1, 16384 tbn, 0.07 tbc
    [22] => Stream mapping:
    [23] =>   Stream #0:0 -> #0:0 (mjpeg -> libx264)
    [24] => Press [q] to stop, [?] for help
    [25] => Input stream #0:0 frame changed from size:200x300 fmt:yuvj420p to size:200x300 fmt:yuvj444p
    [26] => frame=    3 fps=0.0 q=-1.0 Lsize=      43kB time=00:00:15.00 bitrate=  23.2kbits/s
    [27] => video:42kB audio:0kB subtitle:0 global headers:0kB muxing overhead 1.912722%
    [28] => [libx264 @ 0x3283080] frame I:1     Avg QP:18.97  size: 13250
    [29] => [libx264 @ 0x3283080] frame P:2     Avg QP:18.68  size: 14368
    [30] => [libx264 @ 0x3283080] mb I  I16..4:  0.8% 81.4% 17.8%
    [31] => [libx264 @ 0x3283080] mb P  I16..4:  0.0% 84.8% 15.2%  P16..4:  0.0%  0.0%  0.0%  0.0%  0.0%    skip: 0.0%
    [32] => [libx264 @ 0x3283080] 8x8 transform intra:83.7%
    [33] => [libx264 @ 0x3283080] coded y,uvDC,uvAC intra: 96.4% 99.2% 97.6%
    [34] => [libx264 @ 0x3283080] i16 v,h,dc,p:  0%  0% 100%  0%
    [35] => [libx264 @ 0x3283080] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 18% 13%  5%  8% 11%  8% 10%  7%
    [36] => [libx264 @ 0x3283080] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 14%  9%  7%  9% 13%  8%  7%  7%
    [37] => [libx264 @ 0x3283080] i8c dc,h,v,p: 45% 17% 26% 12%
    [38] => [libx264 @ 0x3283080] Weighted P-Frames: Y:0.0% UV:0.0%
    [39] => [libx264 @ 0x3283080] kb/s:7.46

    )

  • FFMPEG frames lost

    4 juin 2018, par ST94

    I use ffmpeg to stream video from the source to destination. The workflow is as follows,
    At the source using ffmpeg, I stream live feed from a webcam using tcp and also save a copy of the live video as mp4 file locally and the command I use is

    $ ffmpeg -hide_banner -f v4l2 -i /dev/video0 -filter:v "fps=30" -c:v libx264 -f mpegts tcp://hostname:port -c:v libx264 /path/to/.mp4file

    `Input #0, video4linux2,v4l2, from '/dev/video0':
     Duration: N/A, start: 272402.639303, bitrate: 147456 kb/s
       Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 147456 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
    Stream mapping:
     Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
     Stream #0:0 -> #1:0 (rawvideo (native) -> h264 (libx264))
    Press [q] to stop, [?] for help
    No pixel format specified, yuv422p for H.264 encoding chosen.
    Use -pix_fmt yuv420p for compatibility with outdated media players.
    [libx264 @ 0x55e421ec9560] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
    [libx264 @ 0x55e421ec9560] profile High 4:2:2, level 3.0, 4:2:2 8-bit
    Output #0, mpegts, to 'tcp://172.16.0.169:50000':
     Metadata:
       encoder         : Lavf57.71.100
       Stream #0:0: Video: h264 (libx264), yuv422p, 640x480, q=-1--1, 30 fps, 90k tbn, 30 tbc
       Metadata:
         encoder         : Lavc57.89.100 libx264
       Side data:
         cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    No pixel format specified, yuv422p for H.264 encoding chosen.
    Use -pix_fmt yuv420p for compatibility with outdated media players.
    [libx264 @ 0x55e421ed5ea0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
    [libx264 @ 0x55e421ed5ea0] profile High 4:2:2, level 3.0, 4:2:2 8-bit
    [libx264 @ 0x55e421ed5ea0] 264 - core 148 r2795 aaa9aa8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - 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=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=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 #1, mp4, to '/path/to/tcp.mp4':
     Metadata:
       encoder         : Lavf57.71.100
       Stream #1:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv422p, 640x480, q=-1--1, 30 fps, 15360 tbn, 30 tbc
       Metadata:
         encoder         : Lavc57.89.100 libx264
       Side data:
         cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    [sana@localhost ~]$ frame=  978 fps= 30 q=-1.0 Lq=-1.0 size=    5062kB time=00:00:32.53 bitrate=1274.6kbits/s dup=514 drop=0 speed=0.991x    
    video:9174kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
    [libx264 @ 0x55e421ec9560] frame I:463   Avg QP:19.03  size:  9994
    [libx264 @ 0x55e421ec9560] frame P:476   Avg QP:22.85  size:   137
    [libx264 @ 0x55e421ec9560] frame B:39    Avg QP:23.33  size:    19
    [libx264 @ 0x55e421ec9560] consecutive B-frames: 94.7%  0.0%  0.0%  5.3%
    [libx264 @ 0x55e421ec9560] mb I  I16..4: 60.4% 39.0%  0.5%
    [libx264 @ 0x55e421ec9560] mb P  I16..4:  0.2%  0.0%  0.0%  P16..4:  4.2%  0.3%  0.5%  0.0%  0.0%    skip:94.8%
    [libx264 @ 0x55e421ec9560] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.0%  0.0%  0.0%  direct: 0.0%  skip:100.0%  L0:15.4% L1:84.6% BI: 0.0%
    [libx264 @ 0x55e421ec9560] 8x8 transform intra:38.9% inter:100.0%
    [libx264 @ 0x55e421ec9560] coded y,uvDC,uvAC intra: 34.9% 97.2% 83.8% inter: 0.0% 1.5% 0.0%
    [libx264 @ 0x55e421ec9560] i16 v,h,dc,p:  0% 31%  0% 69%
    [libx264 @ 0x55e421ec9560] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  3% 50% 16%  4%  2%  1%  6%  1% 17%
    [libx264 @ 0x55e421ec9560] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 10% 52% 14%  4%  7%  3%  5%  1%  3%
    [libx264 @ 0x55e421ec9560] i8c dc,h,v,p: 55% 12% 25%  8%
    [libx264 @ 0x55e421ec9560] Weighted P-Frames: Y:0.2% UV:0.0%
    [libx264 @ 0x55e421ec9560] ref P L0: 96.7%  0.5%  2.7%  0.1%
    [libx264 @ 0x55e421ec9560] kb/s:1151.61
    [libx264 @ 0x55e421ed5ea0] frame I:463   Avg QP:19.02  size: 10007
    [libx264 @ 0x55e421ed5ea0] frame P:477   Avg QP:22.84  size:   140
    [libx264 @ 0x55e421ed5ea0] frame B:39    Avg QP:23.33  size:    19
    [libx264 @ 0x55e421ed5ea0] consecutive B-frames: 94.7%  0.0%  0.0%  5.3%
    [libx264 @ 0x55e421ed5ea0] mb I  I16..4: 60.4% 39.0%  0.5%
    [libx264 @ 0x55e421ed5ea0] mb P  I16..4:  0.3%  0.0%  0.0%  P16..4:  4.2%  0.3%  0.5%  0.0%  0.0%    skip:94.8%
    [libx264 @ 0x55e421ed5ea0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.0%  0.0%  0.0%  direct: 0.0%  skip:100.0%  L0:15.4% L1:84.6% BI: 0.0%
    [libx264 @ 0x55e421ed5ea0] 8x8 transform intra:38.9% inter:100.0%
    [libx264 @ 0x55e421ed5ea0] coded y,uvDC,uvAC intra: 35.0% 97.2% 84.0% inter: 0.0% 1.6% 0.0%
    [libx264 @ 0x55e421ed5ea0] i16 v,h,dc,p:  0% 31%  0% 69%
    [libx264 @ 0x55e421ed5ea0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  3% 50% 16%  4%  2%  1%  6%  1% 17%
    [libx264 @ 0x55e421ed5ea0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 10% 52% 14%  4%  7%  3%  5%  1%  3%
    [libx264 @ 0x55e421ed5ea0] i8c dc,h,v,p: 55% 12% 25%  8%
    [libx264 @ 0x55e421ed5ea0] Weighted P-Frames: Y:0.2% UV:0.0%
    [libx264 @ 0x55e421ed5ea0] ref P L0: 96.8%  0.5%  2.7%  0.1%
    [libx264 @ 0x55e421ed5ea0] kb/s:1152.39`

    At the receiver, I take the tcp url as the input and output it to an mp4 file.

    $ffmpeg -hide_banner -i tcp://hostname:port?listen out.mp4 /path/to/.mp4

    The output is

    `Input #0, mpegts, from 'tcp://172.16.0.169:50000?listen':
     Duration: N/A, start: 1.466667, bitrate: N/A
     Program 1
       Metadata:
         service_name    : Service01
         service_provider: FFmpeg
       Stream #0:0[0x100]: Video: h264 (High 4:2:2) ([27][0][0][0] / 0x001B), yuv422p(progressive), 640x480, 30 fps, 30 tbr, 90k tbn, 60 tbc
    Stream mapping:
     Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
    Press [q] to stop, [?] for help
    No pixel format specified, yuv422p for H.264 encoding chosen.
    Use -pix_fmt yuv420p for compatibility with outdated media players.
    [libx264 @ 0x55c1d6bff0a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
    [libx264 @ 0x55c1d6bff0a0] profile High 4:2:2, level 3.0, 4:2:2 8-bit
    [libx264 @ 0x55c1d6bff0a0] 264 - core 148 r2795 aaa9aa8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - 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=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=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 '/home/sana/Desktop/receiver_new_mp4/tcp2.mp4':
     Metadata:
       encoder         : Lavf57.71.100
       Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv422p, 640x480, q=-1--1, 30 fps, 15360 tbn, 30 tbc
       Metadata:
         encoder         : Lavc57.89.100 libx264
       Side data:
         cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    frame=  160 fps=0.0 q=26.0 size=     158kB time=00:00:03.36 bitrate= 384.5kbits/frame=  175 fps=168 q=26.0 size=     200kB time=00:00:03.86 bitrate= 424.8kbits/frame=  190 fps=119 q=26.0 size=     242kB time=00:00:04.36 bitrate= 453.3kbits/frame=  206 fps= 97 q=29.0 size=     292kB time=00:00:04.90 bitrate= 487.8kbits/frame=  222 fps= 84 q=29.0 size=     336kB time=00:00:05.43 bitrate= 506.5kbits/frame=  238 fps= 75 q=29.0 size=     378kB time=00:00:05.96 bitrate= 519.2kbits/frame=  254 fps= 68 q=29.0 size=     422kB time=00:00:06.50 bitrate= 531.6kbits/frame=  270 fps= 64 q=26.0 size=     457kB time=00:00:07.03 bitrate= 532.0kbits/frame=  286 fps= 60 q=29.0 size=     511kB time=00:00:07.56 bitrate= 552.8kbits/frame=  302 fps= 57 q=26.0 size=     562kB time=00:00:08.10 bitrate= 568.3kbits/frame=  318 fps= 54 q=26.0 size=     609kB time=00:00:08.63 bitrate= 577.9kbits/frame=  334 fps= 52 q=26.0 size=     674kB time=00:00:09.16 bitrate= 602.7kbits/frame=  350 fps= 51 q=29.0 size=     719kB time=00:00:09.70 bitrate= 606.8kbits/frame=  366 fps= 49 q=26.0 size=     770kB time=00:00:10.23 bitrate= 616.1kbits/frame=  382 fps= 48 q=29.0 size=     828kB time=00:00:10.76 bitrate= 630.3kbits/frame=  398 fps= 47 q=26.0 size=     872kB time=00:00:11.30 bitrate= 632.0kbits/frame=  414 fps= 46 q=26.0 size=     933kB time=00:00:11.83 bitrate= 645.9kbits/frame=  430 fps= 45 q=29.0 size=     987kB time=00:00:12.36 bitrate= 653.9kbits/frame=  446 fps= 44 q=26.0 size=    1033kB time=00:00:12.90 bitrate= 656.2kbits/frame=  462 fps= 43 q=29.0 size=    1098kB time=00:00:13.43 bitrate= 669.7kbits/frame=  478 fps= 43 q=29.0 size=    1132kB time=00:00:13.96 bitrate= 664.2kbits/frame=  548 fps= 47 q=-1.0 Lsize=    1536kB time=00:00:18.16 bitrate= 692.8kbits/s speed=1.56x    
    video:1531kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.377405%
    [libx264 @ 0x55c1d6bff0a0] frame I:115   Avg QP:18.12  size:  8204
    [libx264 @ 0x55c1d6bff0a0] frame P:203   Avg QP:21.62  size:  1893
    [libx264 @ 0x55c1d6bff0a0] frame B:230   Avg QP:21.99  size:  1039
    [libx264 @ 0x55c1d6bff0a0] consecutive B-frames: 41.1%  6.6%  7.1% 45.3%
    [libx264 @ 0x55c1d6bff0a0] mb I  I16..4: 67.6% 32.3%  0.1%
    [libx264 @ 0x55c1d6bff0a0] mb P  I16..4: 15.3%  3.1%  0.0%  P16..4: 28.6%  2.8%  2.0%  0.0%  0.0%    skip:48.3%
    [libx264 @ 0x55c1d6bff0a0] mb B  I16..4:  0.8%  0.3%  0.0%  B16..8: 26.2%  0.4%  0.0%  direct:13.5%  skip:58.7%  L0:65.0% L1:34.5% BI: 0.5%
    [libx264 @ 0x55c1d6bff0a0] 8x8 transform intra:28.4% inter:100.0%
    [libx264 @ 0x55c1d6bff0a0] coded y,uvDC,uvAC intra: 15.0% 89.4% 53.1% inter: 2.6% 28.7% 0.2%
    [libx264 @ 0x55c1d6bff0a0] i16 v,h,dc,p:  2% 49%  1% 47%
    [libx264 @ 0x55c1d6bff0a0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  6% 57% 19%  2%  1%  1%  4%  1%  9%
    [libx264 @ 0x55c1d6bff0a0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 59% 18%  1%  2%  1%  2%  0%  1%
    [libx264 @ 0x55c1d6bff0a0] i8c dc,h,v,p: 52% 17% 27%  4%
    [libx264 @ 0x55c1d6bff0a0] Weighted P-Frames: Y:17.7% UV:6.9%
    [libx264 @ 0x55c1d6bff0a0] ref P L0: 68.7%  0.7% 18.3% 10.6%  1.7%
    [libx264 @ 0x55c1d6bff0a0] ref B L0: 86.1% 10.6%  3.3%
    [libx264 @ 0x55c1d6bff0a0] ref B L1: 96.6%  3.4%
    [libx264 @ 0x55c1d6bff0a0] kb/s:686.10`

    From the ffmpeg processes running on both ends, if you notice the number of B frames at the receiver is more than the B frames at the sender. In other cases that I tried, the number of I as well as P frames are higher at the receiver than that at the sender.
    Can anyone please tell me why is it so ? I am not able to figure out why.

  • Capture video from webcam using ffmpeg - finish streaming without any data to written it

    7 septembre 2017, par Robert

    I have webcam in my computer and ffmpeg 3.3.0
    I run this command :

    ffmpeg -y -f vfwcap -r 25 -i 0 out1.mp4

    I have no errors but the output file is empty.

    c:\..\bin>ffmpeg -y -f vfwcap -r 25 -i 0 out1.mp4
    ffmpeg version N-87130-g2b9fd15 Copyright (c) 2000-2017 the FFmpeg developers
     built with gcc 7.1.0 (GCC)
     configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --e
    nable-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-li
    bfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug -
    -enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enabl
    e-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li
    bsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolam
    e --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. 74.100 / 55. 74.100
     libavcodec     57.104.100 / 57.104.100
     libavformat    57. 79.100 / 57. 79.100
     libavdevice    57.  8.100 / 57.  8.100
     libavfilter     6.101.100 /  6.101.100
     libswscale      4.  7.103 /  4.  7.103
     libswresample   2.  8.100 /  2.  8.100
     libpostproc    54.  6.100 / 54.  6.100
    Input #0, vfwcap, from '0':
     Duration: N/A, bitrate: N/A
       Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 25 fps,
    1k tbr, 1k tbn, 1k tbc
    Stream mapping:
     Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
    Press [q] to stop, [?] for help
    Finishing stream 0:0 without any data written to it.
    [libx264 @ 00000000004f5160] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
    AVX FMA3 BMI2 AVX2
    [libx264 @ 00000000004f5160] profile High 4:2:2, level 3.0, 4:2:2 8-bit
    [libx264 @ 00000000004f5160] 264 - core 152 r2851 ba24899 - H.264/MPEG-4 AVC cod
    ec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 r
    ef=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_pski
    p=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 deci
    mate=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=2
    5 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.6
    0 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
    Output #0, mp4, to 'out1.mp4':
     Metadata:
       encoder         : Lavf57.79.100
       Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv422p, 640x480, q=
    -1--1, 25 fps, 12800 tbn, 25 tbc
       Metadata:
         encoder         : Lavc57.104.100 libx264
       Side data:
         cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=00:00:00.00 bitrate=N/A speed=
    0x
    video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing ove
    rhead: unknown
    Exiting normally, received signal 2.

    c:\..\bin>

    My operating system is Windows 7.