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La conservation du net art au musée. Les stratégies à l’œuvre
26 mai 2011
Mis à jour : Juillet 2013
Langue : français
Type : Texte
Autres articles (106)
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Publier sur MédiaSpip
13 juin 2013Puis-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 -
Encoding and processing into web-friendly formats
13 avril 2011, parMediaSPIP automatically converts uploaded files to internet-compatible formats.
Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
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All uploaded files are stored online in their original format, so you can (...) -
Ajouter des informations spécifiques aux utilisateurs et autres modifications de comportement liées aux auteurs
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Sur d’autres sites (11428)
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Android FFmpeg : Undefined references to atof, log2 & log2f
30 novembre 2020, par Quantum_ProgrammerI am trying to link to FFmpeg built for android using android-ndk-r15c. I built this by downloading FFmpeg source that is latest ffmpeg-3.3.4.



Following are my linker list :



-lavformat -lavcodec -lswscale -lavutil -lavfilter -lswresample -lavdevice -lpostproc



I get the following errors complaining



libavformat/hls.c:783: error: undefined reference to 'atof'
libavcodec/ffv1enc.c:146: error: undefined reference to 'log2'
libavcodec/imc.c:428: error: undefined reference to 'log2f'



Following are my FFmpeg related includes :



#include 
#include <cstdlib>

#define __STDC_CONSTANT_MACROS

extern "C" {

#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libavutil/mathematics.h"
#include "libavcodec/version.h"
#include "libavutil/rational.h"
#include "libavutil/avstring.h"
#include "libswscale/swscale.h"

}
</cstdlib>


Following is my buildscript to cross-compile FFmpeg for android :



#!/bin/bash

cd ffmpeg-3.3.4

NDK=/path/to/ndk/android-ndk-r15c
SYSROOT=$NDK/platforms/android-21/arch-arm/
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64
AR=$TOOLCHAIN/bin/arm-linux-androideabi-ar
CPREFIX=$TOOLCHAIN/bin/arm-linux-androideabi-ar
CC=$TOOLCHAIN/bin/arm-linux-androideabi-gcc
CXX=$TOOLCHAIN/bin/arm-linux-androideabi-g++
LD=$TOOLCHAIN/bin/arm-linux-androideabi-ld
RANLIB=$TOOLCHAIN/bin/arm-linux-androideabi-ranlib
STRIP=$TOOLCHAIN/bin/arm-linux-androideabi-strip

function build_ffmpeg_android {

./configure \
 --prefix=$PREFIX \
 --disable-stripping \
 --arch=arm \
 --cpu=cortex-a8 \
 --target-os=linux \
 --enable-cross-compile \
 --enable-debug \
 --enable-pic \
 --disable-programs \
 --enable-static \
 --disable-shared \
 --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
 --disable-doc \
 --enable-postproc \
 --enable-swscale \
 --enable-avfilter \
 --enable-avresample \
 --disable-opencl \
 --disable-securetransport \
 --sysroot=$SYSROOT \
 --enable-videotoolbox \
 --enable-avresample \
 --disable-symver \
 #--enable-gpl \
 #--enable-libx264
 $ADDITIONAL_CONFIGURE_FLAG
 make clean
 make -j9
 make install
}

CPU=arm
PREFIX=$(pwd)/android/$CPU
ADDI_CFLAGS="-marm"

build_ffmpeg_android



Question :

Which library am I missing to link to ?

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FFmpeg command for crossfading between 5 videos .How to manage setpts=PTS-STARTPTS ?
15 novembre 2023, par Harsh BhavsarHere, New in FFmpeg . I am using and testing in console in FFmpeg .





I already done with 2 video join with cross fading with this question :
 I am doing for 5 videos merging with cross fade I just done 90% in merging 
 i just need to manage setpts=PTS-STARTPTS Just look into this pls.





ffmpeg -i big_buck.mp4 -i big_buck.mp4 -i big_buck.mp4 -i big_buck.mp4 -i 
big_buck.mp4 -filter_complex "[0:v]trim=0:4,setpts=PTS-
STARTPTS,fade=out:st=4:d=1:alpha=1[1]; [1:v]trim=1:4,setpts=PTS-
STARTPTS,format=yuva420p,fade=in:st=0:d=1:alpha=1,fade=out:st=4:d=1:alpha=1[2]; 
[2:v]trim=1:4,setpts=PTS-
STARTPTS,format=yuva420p,fade=in:st=0:d=1:alpha=1,fade=out:st=4:d=1:alpha=1[3]; 
[3:v]trim=1:4,setpts=PTS-
STARTPTS,format=yuva420p,fade=in:st=0:d=1:alpha=1,fade=out:st=4:d=1:alpha=1[4]; 
[4:v]trim=1:4,setpts=PTS-STARTPTS,format=yuva420p,fade=in:st=0:d=1:alpha=1[5]; 
[1][2]overlay,format=yuv420p[12]; [12][3]overlay,format=yuv420p[123]; [4]
[5]overlay,format=yuv420p[45]; [123][45]concat=n=2 [v]" -map [v] result.mp4



****Note that every input video big_buck.mp4 length is 5 sec ****. now see setpts=PTS-STARTPTS in code How to Manage that in every video Input ????



I also see in variuos forums about that but i didnt find !!!
Thank you


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FFmpeg command for crossfading between 5 videos .How to manage setpts=PTS-STARTPTS ?
23 juin 2016, par Harsh BhavsarHere, New in FFmpeg . I am using and testing in console in FFmpeg .
I already done with 2 video join with cross fading with this question :
I am doing for 5 videos merging with cross fade I just done 90% in merging
i just need to manage setpts=PTS-STARTPTS Just look into this pls.ffmpeg -i big_buck.mp4 -i big_buck.mp4 -i big_buck.mp4 -i big_buck.mp4 -i
big_buck.mp4 -filter_complex "[0:v]trim=0:4,setpts=PTS-
STARTPTS,fade=out:st=4:d=1:alpha=1[1]; [1:v]trim=1:4,setpts=PTS-
STARTPTS,format=yuva420p,fade=in:st=0:d=1:alpha=1,fade=out:st=4:d=1:alpha=1[2];
[2:v]trim=1:4,setpts=PTS-
STARTPTS,format=yuva420p,fade=in:st=0:d=1:alpha=1,fade=out:st=4:d=1:alpha=1[3];
[3:v]trim=1:4,setpts=PTS-
STARTPTS,format=yuva420p,fade=in:st=0:d=1:alpha=1,fade=out:st=4:d=1:alpha=1[4];
[4:v]trim=1:4,setpts=PTS-STARTPTS,format=yuva420p,fade=in:st=0:d=1:alpha=1[5];
[1][2]overlay,format=yuv420p[12]; [12][3]overlay,format=yuv420p[123]; [4]
[5]overlay,format=yuv420p[45]; [123][45]concat=n=2 [v]" -map [v] result.mp4****Note that every input video big_buck.mp4 length is 5 sec ****. now see setpts=PTS-STARTPTS in code How to Manage that in every video Input ????
I also see in variuos forums about that but i didnt find !!!
Thank you
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