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    10 avril 2011

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    Actuellement MediaSPIP n’est disponible qu’en français et (...)

  • Menus personnalisés

    14 novembre 2010, par

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    13 avril 2011, par

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Sur d’autres sites (5864)

  • Running ffmpeg via PHP

    11 mars 2020, par FionaF

    So the end goal is to have a php script that, given a list of images, will automatically create a slideshow video with transitions and text overlays and maybe an audio track as well.

    I’m competent in coding PHP but not experienced in command line stuff.

    We have a dedicated server and I got hosting company to install ffmpeg for me.

    So I thought I’d start simple and slowly build up to ultimate goal. But I’m really struggling. I’ve spent a couple of days trying all sorts of things with very little success.

    I found this post with some excellent examples https://superuser.com/questions/833232/create-video-with-5-images-with-fadein-out-effect-in-ffmpeg but I can’t get any of them to work. Which makes me think that I’m doing something fundamentally wrong.

    So this does work for me - I get a nice little 30 sec video slideshow of 6 images displaying for 5 secs each :

    $ffmpeg="/usr/bin/ffmpeg";
    
exec($ffmpeg.' -f concat -safe 0 -i input.txt -c:v libx264 -r 30 -pix_fmt yuv420p -y out.mp4 2>&1', $output);
    
var_dump($output);

    and this is input.txt

    file /home/webvivre/public_html/videos/test/i1.jpg
    
duration 5
    
file /home/webvivre/public_html/videos/test/i2.jpg
    
duration 5
    
file /home/webvivre/public_html/videos/test/i3.jpg
    
duration 5
    
file /home/webvivre/public_html/videos/test/i4.jpg
    
duration 5
    
file /home/webvivre/public_html/videos/test/i5.jpg
    
duration 5
    
file /home/webvivre/public_html/videos/test/i6.jpg
    
duration 5

    But this (basically taken from example in link above - have only changed image names and ffmpeg location) doesn’t work for me :

    $code="/usr/bin/ffmpeg -y -loop 1 -i i1.jpg -loop 1 -i i2.jpg -loop 1 -i i3.jpg -filter_complex \" [0:v]zoompan=z='min(zoom+0.0015,1.5)':d=125,trim=duration=5,blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))',setpts=PTS-STARTPTS[v0]; [1:v]zoompan=z='min(zoom+0.0015,1.5)':d=125,trim=duration=5,blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))',setpts=PTS-STARTPTS[v1]; [2:v]zoompan=z='min(zoom+0.0015,1.5)':d=125,trim=duration=5,blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))',setpts=PTS-STARTPTS[v2]; [v0][v1][v2] concat=n=3:v=1:a=0, format=yuv420p[v]\" -map '[v]' -c:v libx264 -pix_fmt yuvj420p -q:v 1 out.mp4 2>&1";
    
exec($code,$output);
    
var_dump($output);

    This is the output :

    array(25) { [0]=> string(67) "ffmpeg version 2.8.15 Copyright (c) 2000-2018 the FFmpeg developers" [1]=> string(56) " built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-36)" [2]=> string(1147) " configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --extra-ldflags='-Wl,-z,relro ' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-gnutls --enable-ladspa --enable-libass --enable-libcdio --enable-libdc1394 --enable-libfdk-aac --enable-nonfree --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect" [3]=> string(40) " libavutil 54. 31.100 / 54. 31.100" [4]=> string(40) " libavcodec 56. 60.100 / 56. 60.100" [5]=> string(40) " libavformat 56. 40.101 / 56. 40.101" [6]=> string(40) " libavdevice 56. 4.100 / 56. 4.100" [7]=> string(40) " libavfilter 5. 40.101 / 5. 40.101" [8]=> string(40) " libavresample 2. 1. 0 / 2. 1. 0" [9]=> string(40) " libswscale 3. 1.101 / 3. 1.101" [10]=> string(40) " libswresample 1. 2.101 / 1. 2.101" [11]=> string(40) " libpostproc 53. 3.100 / 53. 3.100" [12]=> string(38) "[mjpeg @ 0x183c720] Changeing bps to 8" [13]=> string(32) "Input #0, image2, from 'i1.jpg':" [14]=> string(61) " Duration: 00:00:00.04, start: 0.000000, bitrate: 33777 kb/s" [15]=> string(128) " Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1000x750 [SAR 1:1 DAR 4:3], 25 fps, 25 tbr, 25 tbn, 25 tbc" [16]=> string(38) "[mjpeg @ 0x18427c0] Changeing bps to 8" [17]=> string(32) "Input #1, image2, from 'i2.jpg':" [18]=> string(61) " Duration: 00:00:00.04, start: 0.000000, bitrate: 41896 kb/s" [19]=> string(132) " Stream #1:0: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 1000x750 [SAR 300:300 DAR 4:3], 25 fps, 25 tbr, 25 tbn, 25 tbc" [20]=> string(38) "[mjpeg @ 0x1849fa0] Changeing bps to 8" [21]=> string(32) "Input #2, image2, from 'i3.jpg':" [22]=> string(61) " Duration: 00:00:00.04, start: 0.000000, bitrate: 34776 kb/s" [23]=> string(132) " Stream #2:0: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 1000x750 [SAR 300:300 DAR 4:3], 25 fps, 25 tbr, 25 tbn, 25 tbc" [24]=> string(81) "Cannot find a matching stream for unlabeled input pad 1 on filter Parsed_blend_10" }

    And for reference, this is info provided to me by hosting company after installing ffmpeg for me :

    svr01~ # ffmpeg
    
ffmpeg version 2.8.15 Copyright (c) 2000-2018 the FFmpeg developers
    
  built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-36)
    
  configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --extra-ldflags='-Wl,-z,relro ' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-gnutls --enable-ladspa --enable-libass --enable-libcdio --enable-libdc1394 --enable-libfdk-aac --enable-nonfree --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
    
  libavutil      54. 31.100 / 54. 31.100
    
  libavcodec     56. 60.100 / 56. 60.100
    
  libavformat    56. 40.101 / 56. 40.101
    
  libavdevice    56.  4.100 / 56.  4.100
    
  libavfilter     5. 40.101 /  5. 40.101
    
  libavresample   2.  1.  0 /  2.  1.  0
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  2.101 /  1.  2.101
    
  libpostproc    53.  3.100 / 53.  3.100
    
Hyper fast Audio and Video encoder

    If someone could just shove me in the right direction to get the above working I’d be very grateful. I just know it’s going to end up being something really simple.

  • Cortex-A7 instruction cycle timings

    15 mai 2014, par Mans — ARM

    The Cortex-A7 ARM core is a popular choice in low-power and low-cost designs. Unfortunately, the public TRM does not include instruction timing information. It does reveal that execution is in-order which makes measuring the throughput and latency for individual instructions relatively straight-forward.

    The table below lists the measured issue cycles (inverse throughput) and result latency of some commonly used instructions.

    It should be noted that in some cases, the perceived latency depends on the instruction consuming the result. Most of the values were measured with the result used as input to the same instruction. For instructions with multiple outputs, the latencies of the result registers may also differ.

    Finally, although instruction issue is in-order, completion is out of order, allowing independent instructions to issue and complete unimpeded while a multi-cycle instruction is executing in another unit. For example, a 3-cycle MUL instruction does not block ADD instructions following it in program order.

    ALU instructions Issue cycles Result latency
    MOV Rd, Rm 1/2 1
    ADD Rd, Rn, #imm 1/2 1
    ADD Rd, Rn, Rm 1 1
    ADD Rd, Rn, Rm, LSL #imm 1 1
    ADD Rd, Rn, Rm, LSL Rs 1 1
    LSL Rd, Rn, #imm 1 2
    LSL Rd, Rn, Rs 1 2
    QADD Rd, Rn, Rm 1 2
    QADD8 Rd, Rn, Rm 1 2
    QADD16 Rd, Rn, Rm 1 2
    CLZ Rd, Rm 1 1
    RBIT Rd, Rm 1 2
    REV Rd, Rm 1 2
    SBFX Rd, Rn 1 2
    BFC Rd, #lsb, #width 1 2
    BFI Rd, Rn, #lsb, #width 1 2
    NOTE : Shifted operands and shift amounts needed one cycle early.
    Multiply instructions Issue cycles Result latency
    MUL Rd, Rn, Rm 1 3
    MLA Rd, Rn, Rm, Ra 1 31
    SMULL Rd, RdHi, Rn, Rm 1 3
    SMLAL Rd, RdHi, Rn, Rm 1 31
    SMMUL Rd, Rn, Rm 1 3
    SMMLA Rd, Rn, Rm, Ra 1 31
    SMULBB Rd, Rn, Rm 1 3
    SMLABB Rd, Rn, Rm, Ra 1 31
    SMULWB Rd, Rn, Rm 1 3
    SMLAWB Rd, Rn, Rm, Ra 1 31
    SMUAD Rd, Rn, Rm 1 3
    1 Accumulator forwarding allows back to back MLA instructions without delay.
    Divide instructions Issue cycles Result latency
    SDIV Rd, Rn, Rm 4-20 6-22
    UDIV Rd, Rn, Rm 3-19 5-21
    Load/store instructions Issue cycles Result latency
    LDR Rt, [Rn] 1 3
    LDR Rt, [Rn, #imm] 1 3
    LDR Rt, [Rn, Rm] 1 3
    LDR Rt, [Rn, Rm, lsl #imm] 1 3
    LDRD Rt, Rt2, [Rn] 1 3-4
    LDM Rn, regs 1-8 3-10
    STR Rt, [Rn] 1 2
    STRD Rt, Rt2, [Rn] 1 2
    STM Rn, regs 1-10 2-12
    NOTE : Load results are forwarded to dependent stores without delay.
    VFP instructions Issue cycles Result latency
    VMOV.F32 Sd, Sm 1 4
    VMOV.F64 Dd, Dm 1 4
    VNEG.F32 Sd, Sm 1 4
    VNEG.F64 Dd, Dm 1 4
    VABS.F32 Sd, Sm 1 4
    VABS.F64 Dd, Dm 1 4
    VADD.F32 Sd, Sn, Sm 1 4
    VADD.F64 Dd, Dn, Dm 1 4
    VMUL.F32 Sd, Sn, Sm 1 4
    VMUL.F64 Dd, Dn, Dm 4 7
    VMLA.F32 Sd, Sn, Sm 1 81
    VMLA.F64 Dd, Dn, Dm 4 112
    VFMA.F32 Sd, Sn, Sm 1 81
    VFMA.F64 Dd, Dn, Dm 5 82
    VDIV.F32 Sd, Sn, Sm 15 18
    VDIV.F64 Dd, Dn, Dm 29 32
    VSQRT.F32 Sd, Sm 14 17
    VSQRT.F64 Dd, Dm 28 31
    VCVT.F32.F64 Sd, Dm 1 4
    VCVT.F64.F32 Dd, Sm 1 4
    VCVT.F32.S32 Sd, Sm 1 4
    VCVT.F64.S32 Dd, Sm 1 4
    VCVT.S32.F32 Sd, Sm 1 4
    VCVT.S32.F64 Sd, Dm 1 4
    VCVT.F32.S32 Sd, Sd, #fbits 1 4
    VCVT.F64.S32 Dd, Dd, #fbits 1 4
    VCVT.S32.F32 Sd, Sd, #fbits 1 4
    VCVT.S32.F64 Dd, Dd, #fbits 1 4
    1 5 cycles with dependency only on accumulator.
    2 8 cycles with dependency only on accumulator.
    NEON integer instructions Issue cycles Result latency
    VADD.I8 Dd, Dn, Dm 1 4
    VADDL.S8 Qd, Dn, Dm 2 4
    VADD.I8 Qd, Qn, Qm 2 4
    VMUL.I8 Dd, Dn, Dm 2 4
    VMULL.S8 Qd, Dn, Dm 2 4
    VMUL.I8 Qd, Qn, Qm 4 4
    VMLA.I8 Dd, Dn, Dm 2 4
    VMLAL.S8 Qd, Dn, Dm 2 4
    VMLA.I8 Qd, Qn, Qm 4 4
    VADD.I16 Dd, Dn, Dm 1 4
    VADDL.S16 Qd, Dn, Dm 2 4
    VADD.I16 Qd, Qn, Qm 2 4
    VMUL.I16 Dd, Dn, Dm 1 4
    VMULL.S16 Qd, Dn, Dm 2 4
    VMUL.I16 Qd, Qn, Qm 2 4
    VMLA.I16 Dd, Dn, Dm 1 4
    VMLAL.S16 Qd, Dn, Dm 2 4
    VMLA.I16 Qd, Qn, Qm 2 4
    VADD.I32 Dd, Dn, Dm 1 4
    VADDL.S32 Qd, Dn, Dm 2 4
    VADD.I32 Qd, Qn, Qm 2 4
    VMUL.I32 Dd, Dn, Dm 2 4
    VMULL.S32 Qd, Dn, Dm 2 4
    VMUL.I32 Qd, Qn, Qm 4 4
    VMLA.I32 Dd, Dn, Dm 2 4
    VMLAL.S32 Qd, Dn, Dm 2 4
    VMLA.I32 Qd, Qn, Qm 4 4
    NEON floating-point instructions Issue cycles Result latency
    VADD.F32 Dd, Dn, Dm 2 4
    VADD.F32 Qd, Qn, Qm 4 4
    VMUL.F32 Dd, Dn, Dm 2 4
    VMUL.F32 Qd, Qn, Qm 4 4
    VMLA.F32 Dd, Dn, Dm 2 81
    VMLA.F32 Qd, Qn, Qm 4 81
    1 5 cycles with dependency only on accumulator.
    NEON permute instructions Issue cycles Result latency
    VEXT.n Dd, Dn, Dm, #imm 1 4
    VEXT.n Qd, Qn, Qm, #imm 2 5
    VTRN.n Dd, Dn, Dm 2 5
    VTRN.n Qd, Qn, Qm 4 5
    VUZP.n Dd, Dn, Dm 2 5
    VUZP.n Qd, Qn, Qm 4 6
    VZIP.n Dd, Dn, Dm 2 5
    VZIP.n Qd, Qn, Qm 4 6
    VTBL.8 Dd, Dn, Dm 1 4
    VTBL.8 Dd, Dn-Dn+1, Dm 1 4
    VTBL.8 Dd, Dn-Dn+2, Dm 2 5
    VTBL.8 Dd, Dn-Dn+3, Dm 2 5

  • vp8/armv6 : mc : avoid boolean expression in calculation

    9 juillet 2016, par Janne Grunau
    vp8/armv6 : mc : avoid boolean expression in calculation

    GNU as evaluates true as ’-1’ while Apple’s variant and llvm’s internal
    
assembler evaluate it as ’1’. The best way to avoid this madness is to
    
eliminate boolean expressions instead of trying to fix it with
    
preprocessor directives. Use a direct formula to calculate the
    
required temporary space on the stack in
    
ff_put_vp8_epel,bilin4,8,16_h[246]v[246]_armv6().
    

    Fixes a checkasm segfault in vp8dsp.mc when using llvm’s internal
    
assembler for a non-Apple target.
    • [DBH] libavcodec/arm/vp8dsp_armv6.S

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