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Autres articles (26)
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La sauvegarde automatique de canaux SPIP
1er avril 2010, parDans le cadre de la mise en place d’une plateforme ouverte, il est important pour les hébergeurs de pouvoir disposer de sauvegardes assez régulières pour parer à tout problème éventuel.
Pour réaliser cette tâche on se base sur deux plugins SPIP : Saveauto qui permet une sauvegarde régulière de la base de donnée sous la forme d’un dump mysql (utilisable dans phpmyadmin) mes_fichiers_2 qui permet de réaliser une archive au format zip des données importantes du site (les documents, les éléments (...) -
Script d’installation automatique de MediaSPIP
25 avril 2011, parAfin de palier aux difficultés d’installation dues principalement aux dépendances logicielles coté serveur, un script d’installation "tout en un" en bash a été créé afin de faciliter cette étape sur un serveur doté d’une distribution Linux compatible.
Vous devez bénéficier d’un accès SSH à votre serveur et d’un compte "root" afin de l’utiliser, ce qui permettra d’installer les dépendances. Contactez votre hébergeur si vous ne disposez pas de cela.
La documentation de l’utilisation du script d’installation (...) -
Automated installation script of MediaSPIP
25 avril 2011, parTo overcome the difficulties mainly due to the installation of server side software dependencies, an "all-in-one" installation script written in bash was created to facilitate this step on a server with a compatible Linux distribution.
You must have access to your server via SSH and a root account to use it, which will install the dependencies. Contact your provider if you do not have that.
The documentation of the use of this installation script is available here.
The code of this (...)
Sur d’autres sites (4538)
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V4l2 to RTSP stream using FFmpeg library ver 5.1
10 août 2022, par wolverinTrying 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




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 ?


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ffpmeg drops last frame when compressing from MP4 to MP4 (libx264)
28 octobre 2018, par UsoboiSo, 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.mp4The problem is : the last frame of footage is dropped after ffmpeg compression.
Screenshot is here : screenshot_ffmpeg_drop frameI 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.mp4logfile 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 CodingStream 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 : -1frame= 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 UsoboiSo, 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.mp4The problem is : the last frame of footage is dropped after ffmpeg compression.
Screenshot is here : screenshot_ffmpeg_drop frameI 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.mp4logfile 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 CodingStream 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 : -1frame= 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
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