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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 (...)
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FFmpeg : "Invalid data found when processing input" when reading video from memory
24 avril 2020, par DrawoceansI'm trying to read a mp4 video file from memory with C++ and FFmpeg library, but I got "Invalid data found when processing input" error. Here are my codes :



#include <cstdio>
#include <fstream>
#include <filesystem>

extern "C"
{
#include "libavformat/avformat.h"
#include "libavformat/avio.h"
}

using namespace std;
namespace fs = std::filesystem;

struct VideoBuffer
{
 uint8_t* ptr;
 size_t size;
};

static int read_packet(void* opaque, uint8_t* buf, int buf_size)
{
 VideoBuffer* vb = (VideoBuffer*)opaque;
 buf_size = FFMIN(buf_size, vb->size);

 if (!buf_size) {
 return AVERROR_EOF;
 }

 printf("ptr:%p size:%zu\n", vb->ptr, vb->size);

 memcpy(buf, vb->ptr, buf_size);
 vb->ptr += buf_size;
 vb->size -= buf_size;

 return buf_size;
}

void print_ffmpeg_error(int ret)
{
 char* err_str = new char[256];
 av_strerror(ret, err_str, 256);
 printf("%s\n", err_str);
 delete[] err_str;
}

int main()
{
 fs::path video_path = "test.mp4";
 ifstream video_file;
 video_file.open(video_path);
 if (!video_file) {
 abort();
 }
 size_t video_size = fs::file_size(video_path);
 char* video_ptr = new char[video_size];
 video_file.read(video_ptr, video_size);
 video_file.close();

 VideoBuffer vb;
 vb.ptr = (uint8_t*)video_ptr;
 vb.size = video_size;

 AVIOContext* avio = nullptr;
 uint8_t* avio_buffer = nullptr;
 size_t avio_buffer_size = 4096;
 avio_buffer = (uint8_t*)av_malloc(avio_buffer_size);
 if (!avio_buffer) {
 abort();
 }

 avio = avio_alloc_context(avio_buffer, avio_buffer_size, 0, &vb, read_packet, nullptr, nullptr);

 AVFormatContext* fmt_ctx = avformat_alloc_context();
 if (!fmt_ctx) {
 abort();
 }
 fmt_ctx->pb = avio;

 int ret = 0;
 ret = avformat_open_input(&fmt_ctx, nullptr, nullptr, nullptr);
 if (ret < 0) {
 print_ffmpeg_error(ret);
 }

 avformat_close_input(&fmt_ctx);
 av_freep(&avio->buffer);
 av_freep(&avio);
 delete[] video_ptr;
 return 0;
}
</filesystem></fstream></cstdio>


And here is what I got :



ptr:000001E10CEA0070 size:4773617
ptr:000001E10CEA1070 size:4769521
...
ptr:000001E10D32D070 size:1777
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001e10caaeac0] moov atom not found
Invalid data found when processing input



FFmpeg version is 4.2.2, with Windows 10 and Visual Studio 2019 in x64 Debug mode. FFmpeg library is the Windows compiled shared library from FFmpeg homepage. Some codes are from official example
avio_reading.c. Target MP4 file can be played normally by VLC player so I think the file is OK. Is anywhere wrong in my codes ? Or is it an FFmpeg library problem ?

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FFMpeg Concatenation Filters : Stream specifier ':0' in filtergraph matches no streams
8 décembre 2018, par Anthony EdenI am developing an application that relies heavily on FFMpeg to perform various transformations on audio files. I am currently testing my FFMpeg configuration on the command line.
I am trying to concatenate multiple audio files which are in different formats (Primarily MP3, MP2 & WAV). I have been using the official TRAC documentation (https://trac.ffmpeg.org/wiki/How%20to%20concatenate%20(join%2C%20merge)%20media%20files#differentcodec) to help me with this and have created the following command :
ffmpeg -i OHIn.wav -i OHOut.wav -filter_complex '[0:0] [1:0] concat=n=2:a=1 [a]' -map '[a]' output.wavHowever, when I run this on Mac OS X using version 2.0.1 of FFMpeg, I get the following error message :
Stream specifier ':0' in filtergraph description [0:0] [1:0] concat=n=2:a=1 [a] matches no streams.Here is my full output from the terminal :
~/ffmpeg -i OHIn.wav -i OHOut.wav -filter_complex '[0:0] [1:0] concat=n=2:a=1 [a]' -map '[a]' output.wav
ffmpeg version 2.0.1 Copyright (c) 2000-2013 the FFmpeg developers
built on Aug 15 2013 10:56:46 with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --arch=x86_64 --enable-runtime-cpudetect
libavutil 52. 38.100 / 52. 38.100
libavcodec 55. 18.102 / 55. 18.102
libavformat 55. 12.100 / 55. 12.100
libavdevice 55. 3.100 / 55. 3.100
libavfilter 3. 79.101 / 3. 79.101
libswscale 2. 3.100 / 2. 3.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 3.100 / 52. 3.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, wav, from 'OHIn.wav':
Duration: 00:00:06.71, bitrate: 1411 kb/s
Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
Guessed Channel Layout for Input Stream #1.0 : stereo
Input #1, wav, from 'OHOut.wav':
Duration: 00:00:07.19, bitrate: 1411 kb/s
Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
Stream specifier ':0' in filtergraph description [0:0] [1:0] concat=n=2:a=1 [a] matches no streams.I do not understand why this does not work. FFMpeg shows that the streams 0:0 and 1:0 exist in the source files. The only other similar problems online have surrounded the use of the single quote in Windows, however testing of this confirm it does not apply to my Mac command line.
Any help would be much appreciated.
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FFMpeg Android Stagefright SIGSEGV error (h264 decode)
19 avril 2013, par Sergey OchkurI need to decode h264 file to YUV on Android 2.3+. As I understand I need to communicate with Stagefright, as it`s the only way now, after closing access with OpenMAX IL implementations. I have used FFmpeg 0.10 (and tried 0.9/0.9.1..) for this issue, compiled it with NDK7 (and also tried NDK6b with the same result) :
ffmpeg version 0.10 Copyright (c) 2000-2012 the FFmpeg developers
built on Jan 28 2012 14:42:37 with gcc 4.4.3
configuration: --target-os=linux --cross-prefix=arm-linux-androideabi- --arch=arm --cpu=armv7-a --sysroot=/home/grid/Android/Android_NDK/platforms/android-9/arch-arm --disable-avdevice --disable-decoder=h264 --disable-decoder=h264_vdpau --enable-libstagefright-h264 --prefix=build/stagefright/armeabi-v7a --extra-cflags='-Iandroid-source/frameworks/base/include -Iandroid-source/system/core/include -Iandroid-source/frameworks/base/media/libstagefright -Iandroid-source/frameworks/base/include/media/stagefright/openmax -I/home/grid/Android/Android_NDK/sources/cxx-stl/system/include -march=armv7-a -mfloat-abi=softfp -mfpu=neon' --extra-ldflags='-Wl,--fix-cortex-a8 -Landroid-libs -Wl,-rpath-link,android-libs' --extra-cxxflags='-Wno-multichar -fno-exceptions -fno-rtti'
libavutil 51. 34.101 / 51. 34.101
libavcodec 53. 60.100 / 53. 60.100
libavformat 53. 31.100 / 53. 31.100
libavfilter 2. 60.100 / 2. 60.100
libswscale 2. 1.100 / 2. 1.100
libswresample 0. 6.100 / 0. 6.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...Hardware : Beagleboard-Xm + TI Android 2.3 (official)
So, entering next command give me error with 480p :
ffmpeg -i /sdcard/Video/480p.mp4Stopped (signal) ffmpeg -i /sdcard/Video/480p.mp4
Full Android "answer" from ADB Logcat :
http://pastebin.com/76JLgtXXAndroid-developers, does anybody know what this error means and how to deal with it ?
I tried to make DSP window bigger, but with no luck.
Commands like "stagefright /sdcard/Video/480p.mp4" works fine.P.S. Additionally I found that on some bigger files (720p) Android answers next :
[libstagefright_h264 @ 0xd479b0] Decode failed : 80000000
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