Recherche avancée

Médias (0)

Mot : - Tags -/flash

Aucun média correspondant à vos critères n’est disponible sur le site.

Autres articles (112)

  • Personnaliser en ajoutant son logo, sa bannière ou son image de fond

    5 septembre 2013, par

    Certains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo ; l’ajout d’une bannière l’ajout d’une image de fond ;

  • Emballe médias : à quoi cela sert ?

    4 février 2011, par

    Ce plugin vise à gérer des sites de mise en ligne de documents de tous types.
    Il crée des "médias", à savoir : un "média" est un article au sens SPIP créé automatiquement lors du téléversement d’un document qu’il soit audio, vidéo, image ou textuel ; un seul document ne peut être lié à un article dit "média" ;

  • Soumettre améliorations et plugins supplémentaires

    10 avril 2011

    Si vous avez développé une nouvelle extension permettant d’ajouter une ou plusieurs fonctionnalités utiles à MediaSPIP, faites le nous savoir et son intégration dans la distribution officielle sera envisagée.
    Vous pouvez utiliser la liste de discussion de développement afin de le faire savoir ou demander de l’aide quant à la réalisation de ce plugin. MediaSPIP étant basé sur SPIP, il est également possible d’utiliser le liste de discussion SPIP-zone de SPIP pour (...)

Sur d’autres sites (11163)

  • Unable to encode single frame h264 (.mp4) video with FFmpeg. No video stream present

    1er avril 2021, par Maxito

    I have achieved this with ffmpeg command line tool using the command. The folder had only one image.

    



    


    ffmpeg -r 24 -i image%03d.bmp -c:v libx264 -pix_fmt yuv420p
 oneframex.mp4

    


    



    I would like to do the same with C++. If I encode a video of three or more frames, video encodes correctly, but the result of encoding a one or two frames video never has a video stream, as reported by ffprobe and some media players.

    



    Comparing with ffprobe, my video (the one with three or more frames) and the one generated by the command tool show almost the same information. Only bitrate and encoder version are different.

    



    I have tried adding force_key_frames to 1, tried with many encoding options and have be unsuccessful.

    



    The application output gives me this information :

    



    


    [libx264 @ 20d1b840] using cpu capabilities : MMX2 SSE2Fast SSSE3
 SSE4.2 AVX

    
 


    [libx264 @ 20d1b840] profile High, level 4.0

    
 


    [libx264 @ 20d1b840] 264 - core 142 r2431 ac76440 - H.264/MPEG-4 AVC
 codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html -
 options : cabac=0 ref=1 deblock=1:0:0 analyse=0x3:0x113 me=dia subme=8
 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=0 trellis=0
 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2
 threads=1 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1
 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0
 keyint=1 keyint_min=1 scenecut=0 intra_refresh=0 rc=crf mbtree=0
 crf=10.0 qcomp=0.60 qpmin=0 qpmax=25 qpstep=4 ip_ratio=1.40 aq=1:1.00

    


    



    These are my main parameters :

    



    pCodecCtx->codec_id = AV_CODEC_ID_H264;
pCodecCtx->pix_fmt= AV_PIX_FMT_YUV420P; 
pCodecCtx->gop_size = 1;
pCodecCtx->bit_rate = 400000;
pCodecCtx->me_range = 16;
pCodecCtx->max_qdiff = 4;
pCodecCtx->qcompress = 0.6;
pCodecCtx->qmin = 0;
pCodecCtx->qmax = 25;
pCodecCtx->time_base.den = 24;
pCodecCtx->time_base.num = 1;

AVDictionary *param = 0;
            av_dict_set(&param, "preset", "slow", 0);
            av_dict_set(&param, "profile", "high", 0);
            av_dict_set(&param, "crf", "10", 0); //this gave me quality
            av_dict_set(&param, "force_key_frames", "1", 0);


    



    In my encoding I just added

    



    ppicture->pts = pCodecCtx->frame_number


    



    to avoid non-strictly-monotonic PTS message. And tried the methods from this question in case it had something to do.

    



    I’m sure I must be missing some important parameter to be able to create such a small video. I will take any suggestion.

    


  • Unable to encode single frame h264 (.mp4) video with FFmpeg. No video stream present

    5 mai 2015, par Maxito

    I have achieved this with ffmpeg command line tool using the command. The folder had only one image.

    ffmpeg -r 24 -i image%03d.bmp -c:v libx264 -pix_fmt yuv420p
    oneframex.mp4

    I would like to do the same with C++. If I encode a video of three or more frames, video encodes correctly, but the result of encoding a one or two frames video never has a video stream, as reported by ffprobe and some media players.

    Comparing with ffprobe, my video (the one with three or more frames) and the one generated by the command tool show almost the same information. Only bitrate and encoder version are different.

    I have tried adding force_key_frames to 1, tried with many encoding options and have be unsuccessful.

    The application output gives me this information :

    [libx264 @ 20d1b840] using cpu capabilities : MMX2 SSE2Fast SSSE3
    SSE4.2 AVX

    [libx264 @ 20d1b840] profile High, level 4.0

    [libx264 @ 20d1b840] 264 - core 142 r2431 ac76440 - H.264/MPEG-4 AVC
    codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html -
    options : cabac=0 ref=1 deblock=1:0:0 analyse=0x3:0x113 me=dia subme=8
    psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=0 trellis=0
    8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2
    threads=1 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1
    interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0
    keyint=1 keyint_min=1 scenecut=0 intra_refresh=0 rc=crf mbtree=0
    crf=10.0 qcomp=0.60 qpmin=0 qpmax=25 qpstep=4 ip_ratio=1.40 aq=1:1.00

    These are my main parameters :

    pCodecCtx->codec_id = AV_CODEC_ID_H264;
    pCodecCtx->pix_fmt= AV_PIX_FMT_YUV420P;
    pCodecCtx->gop_size = 1;
    pCodecCtx->bit_rate = 400000;
    pCodecCtx->me_range = 16;
    pCodecCtx->max_qdiff = 4;
    pCodecCtx->qcompress = 0.6;
    pCodecCtx->qmin = 0;
    pCodecCtx->qmax = 25;
    pCodecCtx->time_base.den = 24;
    pCodecCtx->time_base.num = 1;

    AVDictionary *param = 0;
               av_dict_set(&param, "preset", "slow", 0);
               av_dict_set(&param, "profile", "high", 0);
               av_dict_set(&param, "crf", "10", 0); //this gave me quality
               av_dict_set(&param, "force_key_frames", "1", 0);

    In my encoding I just added

    ppicture->pts = pCodecCtx->frame_number

    to avoid non-strictly-monotonic PTS message. And tried the methods from this question in case it had something to do.

    I’m sure I must be missing some important parameter to be able to create such a small video. I will take any suggestion.

  • FFMPEG : Youtube streaming issues

    23 février 2019, par Alex Paramonov

    I am trying to make a reliable stream from my Icecast/Shoutcast servers to Youtube live.
    The command that I use is :

    /usr/bin/ffmpeg -re -loop 1 -framerate 1 -i /var/users/youtube_stream/DJ-philadelphia_jO46wsH.jpg -i http://127.0.0.1:4700/radio -c:v libx264 -preset ultrafast -maxrate 2048k -bufsize 2048k -c:a copy -ab 128k -s 1920x1080 -rtmp_live live -f flv rtmp://a.rtmp.youtube.com/live2/k123 -nostats

    The stream starts running but suddenly stops at random times with the output similar to this :

    av_interleaved_write_frame(): Broken pipe
    [flv @ 0x5641e04db260] Failed to update header with correct duration.
    [flv @ 0x5641e04db260] Failed to update header with correct filesize.
    Error writing trailer of rtmp://a.rtmp.youtube.com/live2/123: Broken pipe
    frame= 4771 fps=1.0 q=2.0 Lsize=  106465kB time=01:19:30.00 bitrate= 182.8kbits/s speed=   1x
    video:29022kB audio:74516kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.825971%
    Conversion failed!
    99%
    Exiting normally, received signal 15.

    I can’t say exactly why is this happening and maybe there is a way to fix it, but to mee it looks like ffmpeg can not send or convert some frame and it breaks the entire process, so I started digging the docs and found a fifo format that has reconnection options in case of failure.
    So my new command is :

    /usr/bin/ffmpeg -re -loop 1 -framerate 1 -i /var/users/youtube_stream/DJ-philadelphia_jO46wsH.jpg -i http://127.0.0.1:4700/radio -c:v libx264 -preset ultrafast -maxrate 2048k -bufsize 2048k -c:a copy -ab 128k -s 1920x1080 -rtmp_live live -f fifo -fifo_format flv -map 0:v -map 1:a -drop_pkts_on_overflow 1 -attempt_recovery 1 -recovery_wait_time 1 rtmp://a.rtmp.youtube.com/live2/123 -nostats

    With this command Youtube starts complaining about video resolution saying that 65535x65535 is not supported, value 65535 looks like something is not initialized properly. Please note that I have explicitly set the resolution with -s 1920x1080.

    The output from FLV and FIFO formats looks quite similar.

    FLV

    Input #0, image2, from '/var/users/youtube_stream/DJ-philadelphia_jO46wsH.jpg':
     Duration: 00:00:01.00, start: 0.000000, bitrate: 597 kb/s
       Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], 1 fps, 1 tbr, 1 tbn, 1 tbc
    Input #1, mp3, from 'http://127.0.0.1:4700/radio':
     Metadata:
       icy-br          : 128
       icy-description : test
       icy-genre       : test
       icy-name        : Test
       icy-pub         : 1
       StreamTitle     : silence
     Duration: N/A, start: 0.000000, bitrate: 128 kb/s
       Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
    Stream mapping:
     Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
     Stream #1:0 -> #0:1 (copy)
    Press [q] to stop, [?] for help
    [libx264 @ 0x563bdde386a0] using SAR=1/1
    [libx264 @ 0x563bdde386a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    [libx264 @ 0x563bdde386a0] profile Constrained Baseline, level 4.0
    [libx264 @ 0x563bdde386a0] 264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=18 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=1 scenecut=0 intra_refresh=0 rc_lookahead=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=2048 vbv_bufsize=2048 crf_max=0.0 nal_hrd=none filler=0 ip_ratio=1.40 aq=0
    Output #0, flv, to 'rtmp://a.rtmp.youtube.com/live2/k478-1xpz-v2de-5e79':
     Metadata:
       encoder         : Lavf57.83.100
       Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuvj420p(pc), 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 1 fps, 1k tbn, 1 tbc
       Metadata:
         encoder         : Lavc57.107.100 libx264
       Side data:
         cpb: bitrate max/min/avg: 2048000/0/0 buffer size: 2048000 vbv_delay: -1
       Stream #0:1: Audio: mp3 ([2][0][0][0] / 0x0002), 44100 Hz, stereo, s16p, 128 kb/s

    FIFO

    Input #0, image2, from '/var/users/youtube_stream/DJ-philadelphia_jO46wsH.jpg':
     Duration: 00:00:01.00, start: 0.000000, bitrate: 597 kb/s
       Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], 1 fps, 1 tbr, 1 tbn, 1 tbc
    Input #1, mp3, from 'http://127.0.0.1:4700/radio':
     Metadata:
       icy-br          : 128
       icy-description : test
       icy-genre       : test
       icy-name        : Test
       icy-pub         : 1
       StreamTitle     : silence
     Duration: N/A, start: 0.000000, bitrate: 128 kb/s
       Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
    Stream mapping:
     Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
     Stream #1:0 -> #0:1 (copy)
    Press [q] to stop, [?] for help
    [libx264 @ 0x560fb2209ae0] using SAR=1/1
    [libx264 @ 0x560fb2209ae0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    [libx264 @ 0x560fb2209ae0] profile Constrained Baseline, level 4.0
    Output #0, fifo, to 'rtmp://a.rtmp.youtube.com/live2/k478-1xpz-v2de-5e79':
     Metadata:
       encoder         : Lavf57.83.100
       Stream #0:0: Video: h264 (libx264), yuvj420p(pc), 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 1 fps, 1 tbn, 1 tbc
       Metadata:
         encoder         : Lavc57.107.100 libx264
       Side data:
         cpb: bitrate max/min/avg: 2048000/0/0 buffer size: 2048000 vbv_delay: -1
       Stream #0:1: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s

    you can see the input streams, output, mapping - all fine except one line that is missing with fifo format :

    [libx264 @ 0x563bdde386a0] 264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html ...

    Seems like video codec is not completely initialized and does not start with when using fifo format.

    So my questions are :

    1. is there a way to create a reliable stream with ffmpeg w/o using
      fifo format ?
    2. if fifo format is mandatory in this case, what’s wrong with my
      video codec ?