Recherche avancée

Médias (1)

Mot : - Tags -/epub

Autres articles (104)

  • 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 (...)

  • 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 ;

  • Publier sur MédiaSpip

    13 juin 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
    Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir

Sur d’autres sites (8028)

  • V4l2 to RTSP stream using FFmpeg library ver 5.1

    10 août 2022, par wolverin

    Trying to transcode MJPEG in /dev/video0 to H264 RTSP server

    


    The MJPEG packet is read correctly, transcoded by the procedure below without errors

    


    BUT the image is corrupted after the middle of the picture and freezes

    


    1

    


    int WriteStream()
{
    int rt = 0;
    int64_t time_start = av_gettime_relative();

    if ((rt = avcodec_send_packet(pInpCdcCtx, pInpPkt)) < 0)
        goto ERROR;

    do {
        rt = avcodec_receive_frame(pInpCdcCtx, pInpFrm);
        if (rt == AVERROR_EOF || rt == AVERROR(EAGAIN))
            break;
        else if (rt < 0)
            goto ERROR_FRM;

int64_t time_dec = av_gettime_relative();

        if (pSwsCtx) /* it is NOT USED now because it is very slow, WHY???  and pOutFrm = pInpFrm */
        {
            pOutFrm->pts = pInpFrm->pts;

            sws_scale(pSwsCtx,
                    (const uint8_t * const *) pInpFrm->data, pInpFrm->linesize, 0, pInpCdcCtx->height,
                    pOutFrm->data, pOutFrm->linesize);
        }
        else
        {
            pInpFrm->key_frame = 0;
            pInpFrm->pict_type = AV_PICTURE_TYPE_NONE;
        }

int64_t time_sws = av_gettime_relative();


        if ((rt = avcodec_send_frame(pOutCdcCtx, pOutFrm)) < 0)
            goto ERROR_FRM;

        do {
            rt = avcodec_receive_packet(pOutCdcCtx, pOutPkt);
            if (rt == AVERROR_EOF || rt == AVERROR(EAGAIN))
                break;
            else if (rt < 0)
                goto ERROR_PKT;

int64_t time_enc = av_gettime_relative();

            fprintf(stdout, "Packet size inp: %d out: %d bytes Time decode: %.2f scale: %.2f encode: %.2f transcode: %.2f ms ...\r",
                            pInpPkt->size, pOutPkt->size, (time_dec - time_start)/1000.0, (time_sws - time_dec)/1000.0, (time_enc - time_sws)/1000.0, (av_gettime_relative() - time_start)/1000.0);

            rt = av_interleaved_write_frame(pOutFmtCtx, pOutPkt);

            av_packet_unref(pOutPkt);
        } while (rt >= 0);

        av_frame_unref(pInpFrm);
    } while (rt >= 0);
    return 0;

ERROR_PKT:
    av_packet_unref(pOutPkt);
ERROR_FRM:
    av_frame_unref(pInpFrm);
ERROR:
    PrintError("Error transcoding", rt);
    return rt;
}


    


    The dump looks like this

    


    Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 20815.488118, bitrate: N/A
  Stream #0:0: Video: mjpeg (Baseline), yuvj422p(pc, bt470bg/unknown/unknown), 640x480, 30 fps, 30 tbr, 1000k tbn
[libx264 @ 0x14e12c0] using cpu capabilities: ARMv6 NEON
[libx264 @ 0x14e12c0] profile High 4:2:2, level 3.0, 4:2:2 8-bit
[libx264 @ 0x14e12c0] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - 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=4 lookahead_threads=4 sliced_threads=1 slices=4 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc_lookahead=0 rc=cbr mbtree=0 bitrate=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=500 vbv_bufsize=1000 nal_hrd=none filler=0 ip_ratio=1.40 aq=0
Output #0, rtsp, to 'rtsp://127.0.0.1:554/cam':
  Stream #0:0: Video: h264, yuv422p(tv, bt470bg/unknown/unknown), 640x480, q=2-31, 500 kb/s, 30 tbr, 90k tbn


    


    The app itself is working fine

    


    ./ffmpeg -f v4l2 -input_format mjpeg -video_size 640x480 -i /dev/video0 -c:v libx264 -pix_fmt yuv422p -preset ultrafast -r 30 -b:v 500k -minrate:v 300k -maxrate:v 500k -bufsize 1000k -f rtsp -rtsp_transport udp rtsp ://192.168.36.212:554/cam

    


    maybe somehow it is necessary to set pts, dts and pkt_pos ?

    


  • ffpmeg drops last frame when compressing from MP4 to MP4 (libx264)

    28 octobre 2018, par Usoboi

    So, I’m using this code to compress my *mp4 file. I need to get lower quality and decrease bitrate :

    ffmpeg -i input.mp4 -c:v libx264 output.mp4

    The problem is : the last frame of footage is dropped after ffmpeg compression.
    Screenshot is here : screenshot_ffmpeg_drop frame

    I tried to use full preferences I need, but the problem is the same.

    ffmpeg -i input.mp4 -c:v libx264 -vf scale=1280:720 -preset fast -crf 29 -r 25 -c:a copy output.mp4

    logfile during ffmpeg encoding :

    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from ’\input.mp4’ :
    Metadata :
    major_brand : mp42
    minor_version : 0
    compatible_brands : mp42mp41
    creation_time : 2018-10-28T11:06:03.000000Z
    Duration : 00:00:12.76, start : 0.000000, bitrate : 5374 kb/s
    Stream #0:0(eng) : Video : h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 5368 kb/s, 25 fps, 25 tbr, 50k tbn, 50 tbc (default)
    Metadata :
    creation_time : 2018-10-28T11:06:03.000000Z
    handler_name : Alias Data Handler
    encoder : AVC Coding

    Stream mapping : Stream #0:0 -> #0:0 (h264 (native) -> h264
    (libx264)) Press [q] to stop, [?] for help [libx264 @
    000002fae8b50780] using SAR=1/1 [libx264 @ 000002fae8b50780] using cpu
    capabilities : MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 [libx264 @
    000002fae8b50780] profile High, level 3.1 [libx264 @ 000002fae8b50780]
    264 - core 155 r2901 7d0ff22 - H.264/MPEG-4 AVC codec - Copyleft
    2003-2018 - 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=29.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40
    aq=1:1.00 Output #0, mp4, to ’\output.mp4’ : Metadata :
    major_brand : mp42
    minor_version : 0
    compatible_brands : mp42mp41
    encoder : Lavf58.17.100
    Stream #0:0(eng) : Video : h264 (libx264) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1—1, 25 fps, 12800 tbn, 25
    tbc (default)
    Metadata :
    creation_time : 2018-10-28T11:06:03.000000Z
    handler_name : Alias Data Handler
    encoder : Lavc58.19.104 libx264
    Side data :
    cpb : bitrate max/min/avg : 0/0/0 buffer size : 0 vbv_delay : -1

    frame= 318 fps=127 q=-1.0 Lsize= 855kB time=00:00:12.60 bitrate=
    556.0kbits/s speed=5.05x video:851kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : 0.534683% [libx264 @
    0000015d5cef0500] frame I:2 Avg QP:26.18 size : 67800 [libx264 @
    0000015d5cef0500] frame P:80 Avg QP:27.93 size : 5439 [libx264 @
    0000015d5cef0500] frame B:236 Avg QP:32.44 size : 1269 [libx264 @
    0000015d5cef0500] consecutive B-frames : 0.9% 0.0% 0.9% 98.1%
    [libx264 @ 0000015d5cef0500] mb I I16..4 : 10.6% 62.5% 26.8% [libx264
    @ 0000015d5cef0500] mb P I16..4 : 0.5% 1.0% 0.2% P16..4 : 36.1%
    5.1% 3.6% 0.0% 0.0% skip:53.6% [libx264 @ 0000015d5cef0500] mb B I16..4 : 0.6% 0.5% 0.0% B16..8 : 22.2% 0.6% 0.0% direct : 2.0%
    skip:74.2% L0:44.9% L1:54.5% BI : 0.6% [libx264 @ 0000015d5cef0500]
    8x8 transform intra:55.0% inter:86.2% [libx264 @ 0000015d5cef0500]
    coded y,uvDC,uvAC intra : 48.1% 54.9% 27.0% inter : 3.2% 5.2% 0.2%
    [libx264 @ 0000015d5cef0500] i16 v,h,dc,p : 19% 56% 10% 15% [libx264 @
    0000015d5cef0500] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu : 19% 25% 18% 5% 6%
    5% 8% 5% 8% [libx264 @ 0000015d5cef0500] i4
    v,h,dc,ddl,ddr,vr,hd,vl,hu : 27% 24% 9% 5% 8% 7% 9% 5% 7%
    [libx264 @ 0000015d5cef0500] i8c dc,h,v,p : 60% 20% 15% 4% [libx264 @
    0000015d5cef0500] Weighted P-Frames : Y:0.0% UV:0.0% [libx264 @
    0000015d5cef0500] ref P L0 : 67.7% 32.3% [libx264 @ 0000015d5cef0500]
    ref B L0 : 80.4% 19.6% [libx264 @ 0000015d5cef0500] ref B L1 : 92.1%
    7.9% [libx264 @ 0000015d5cef0500] kb/s:547.35

  • ffpmeg drops last frame when compressing from MP4 to MP4 (libx264)

    28 octobre 2018, par Usoboi

    So, I’m using this code to compress my *mp4 file. I need to get lower quality and decrease bitrate :

    ffmpeg -i input.mp4 -c:v libx264 output.mp4

    The problem is : the last frame of footage is dropped after ffmpeg compression.
    Screenshot is here : screenshot_ffmpeg_drop frame

    I tried to use full preferences I need, but the problem is the same.

    ffmpeg -i input.mp4 -c:v libx264 -vf scale=1280:720 -preset fast -crf 29 -r 25 -c:a copy output.mp4

    logfile during ffmpeg encoding :

    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from ’\input.mp4’ :
    Metadata :
    major_brand : mp42
    minor_version : 0
    compatible_brands : mp42mp41
    creation_time : 2018-10-28T11:06:03.000000Z
    Duration : 00:00:12.76, start : 0.000000, bitrate : 5374 kb/s
    Stream #0:0(eng) : Video : h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 5368 kb/s, 25 fps, 25 tbr, 50k tbn, 50 tbc (default)
    Metadata :
    creation_time : 2018-10-28T11:06:03.000000Z
    handler_name : Alias Data Handler
    encoder : AVC Coding

    Stream mapping : Stream #0:0 -> #0:0 (h264 (native) -> h264
    (libx264)) Press [q] to stop, [?] for help [libx264 @
    000002fae8b50780] using SAR=1/1 [libx264 @ 000002fae8b50780] using cpu
    capabilities : MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 [libx264 @
    000002fae8b50780] profile High, level 3.1 [libx264 @ 000002fae8b50780]
    264 - core 155 r2901 7d0ff22 - H.264/MPEG-4 AVC codec - Copyleft
    2003-2018 - 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=29.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40
    aq=1:1.00 Output #0, mp4, to ’\output.mp4’ : Metadata :
    major_brand : mp42
    minor_version : 0
    compatible_brands : mp42mp41
    encoder : Lavf58.17.100
    Stream #0:0(eng) : Video : h264 (libx264) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1—1, 25 fps, 12800 tbn, 25
    tbc (default)
    Metadata :
    creation_time : 2018-10-28T11:06:03.000000Z
    handler_name : Alias Data Handler
    encoder : Lavc58.19.104 libx264
    Side data :
    cpb : bitrate max/min/avg : 0/0/0 buffer size : 0 vbv_delay : -1

    frame= 318 fps=127 q=-1.0 Lsize= 855kB time=00:00:12.60 bitrate=
    556.0kbits/s speed=5.05x video:851kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : 0.534683% [libx264 @
    0000015d5cef0500] frame I:2 Avg QP:26.18 size : 67800 [libx264 @
    0000015d5cef0500] frame P:80 Avg QP:27.93 size : 5439 [libx264 @
    0000015d5cef0500] frame B:236 Avg QP:32.44 size : 1269 [libx264 @
    0000015d5cef0500] consecutive B-frames : 0.9% 0.0% 0.9% 98.1%
    [libx264 @ 0000015d5cef0500] mb I I16..4 : 10.6% 62.5% 26.8% [libx264
    @ 0000015d5cef0500] mb P I16..4 : 0.5% 1.0% 0.2% P16..4 : 36.1%
    5.1% 3.6% 0.0% 0.0% skip:53.6% [libx264 @ 0000015d5cef0500] mb B I16..4 : 0.6% 0.5% 0.0% B16..8 : 22.2% 0.6% 0.0% direct : 2.0%
    skip:74.2% L0:44.9% L1:54.5% BI : 0.6% [libx264 @ 0000015d5cef0500]
    8x8 transform intra:55.0% inter:86.2% [libx264 @ 0000015d5cef0500]
    coded y,uvDC,uvAC intra : 48.1% 54.9% 27.0% inter : 3.2% 5.2% 0.2%
    [libx264 @ 0000015d5cef0500] i16 v,h,dc,p : 19% 56% 10% 15% [libx264 @
    0000015d5cef0500] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu : 19% 25% 18% 5% 6%
    5% 8% 5% 8% [libx264 @ 0000015d5cef0500] i4
    v,h,dc,ddl,ddr,vr,hd,vl,hu : 27% 24% 9% 5% 8% 7% 9% 5% 7%
    [libx264 @ 0000015d5cef0500] i8c dc,h,v,p : 60% 20% 15% 4% [libx264 @
    0000015d5cef0500] Weighted P-Frames : Y:0.0% UV:0.0% [libx264 @
    0000015d5cef0500] ref P L0 : 67.7% 32.3% [libx264 @ 0000015d5cef0500]
    ref B L0 : 80.4% 19.6% [libx264 @ 0000015d5cef0500] ref B L1 : 92.1%
    7.9% [libx264 @ 0000015d5cef0500] kb/s:547.35

Navigation