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  • Mise à jour de la version 0.1 vers 0.2

    24 juin 2013, par

    Explications des différents changements notables lors du passage de la version 0.1 de MediaSPIP à la version 0.3. Quelles sont les nouveautés
    Au niveau des dépendances logicielles Utilisation des dernières versions de FFMpeg (>= v1.2.1) ; Installation des dépendances pour Smush ; Installation de MediaInfo et FFprobe pour la récupération des métadonnées ; On n’utilise plus ffmpeg2theora ; On n’installe plus flvtool2 au profit de flvtool++ ; On n’installe plus ffmpeg-php qui n’est plus maintenu au (...)

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    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 ;

  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

Sur d’autres sites (7703)

  • How to force specific AVInputFormat in code (FFMPEG) ?

    18 février 2020, par kugipark

    ++Plaease understand that maybe some words or sentences could not be correct English.++

    I’m novice programmer and developing a video player app for Android which can play 5ch .avi video from http. It based on ffplay.c in FFMPEG libarary.

    Currently I have 2 problems for this below. It has occured only in android devices.

    1) Too much time taken for detecting format.

    • opening and finding stream info takes more than a minute when I trying to open 5ch video source whereas normal .mp4 (h264) source open almost immediately.

    2) Demuxing is too slow when it comes to large size video.

    • If the resolution of video getting larger, then displaying frame rate getting slower even though there are enough memory, network and CPU resources physically.

    To resolve my problem, I tried to force the format and decoders but I couldn’t found some information for specifying the input source in code level.
    The official doc site only refers to a sentence about those parameters like "If non-NULL, this parameter forces a specific input format. Otherwise the format is autodetected.". So I don’t have any clues how to set the number of streams, decoders, decoders’ private options, and etc. (And also which parameters should I manage.) If someone knows how to set the options(like AVDictionary), and pass to the av functions, please let me know an exmple. The source contains 2 video streams, 1 audio stream, and 2 more extra streams (for custom data like gps). The stream information of video is below. I printed it manually, and these are auto-detected information.

        ---------- File format information ----------
    
flags=2097152
    
video_codec_id=0 (NONE)
    
audio_codec_id=0 (NONE)
    
ctx_flags=0
    
data_codec_id=0 (NONE)
    
format_whitelist=(null)
    
iformat=0xa19d0d2c
    
---------- Stream information ----------
    
stream 1 of 5:
    
----- common ----------
    
bit_rate: 11383235
    
bits_per_coded_sample: 24
    
bits_per_raw_sample: 0
    
codec_id: 0x1C (H264)
    
codec_tag: 875967048
    
extradata_size: 0
    
level: -99
    
profile: -99
    
sample_rate: 0
    
----- Video Stream ----------
    
chroma_location: 0
    
color_primaries: 2
    
color_space: 2
    
color_trc: 2
    
field_order: 0
    
format: -1 (NONE)
    
height: 1080
    
width: 1920
    
sample_aspect_ratio.den: 1
    
sample_aspect_ratio.num: 0
    
video_delay: 0
    
----------------------------------------
    
stream 2 of 5:
    
----- common ----------
    
bit_rate: 6185438
    
bits_per_coded_sample: 24
    
bits_per_raw_sample: 0
    
codec_id: 0x1C (H264)
    
codec_tag: 875967048
    
extradata_size: 0
    
level: -99
    
profile: -99
    
sample_rate: 0
    
----- Video Stream ----------
    
chroma_location: 0
    
color_primaries: 2
    
color_space: 2
    
color_trc: 2
    
field_order: 0
    
format: -1 (NONE)
    
height: 720
    
width: 1280
    
sample_aspect_ratio.den: 1
    
sample_aspect_ratio.num: 0
    
video_delay: 0
    
----------------------------------------
    
stream 3 of 5:
    
----- common ----------
    
bit_rate: 352800
    
bits_per_coded_sample: 16
    
bits_per_raw_sample: 0
    
codec_id: 0x10000 (PCM_S16LE)
    
codec_tag: 1
    
extradata_size: 0
    
level: -99
    
profile: -99
    
sample_rate: 22050
    
----- Audio Stream ----------
    
block_align: 2
    
channels: 1
    
channel_layout: 0
    
color_range: 0
    
frame_size: 0
    
initial_padding: 0
    
seek_preroll: 0
    
trailing_padding: 0
    
----------------------------------------
    
stream 4 of 5:
    
----- common ----------
    
bit_rate: 15625
    
bits_per_coded_sample: 0
    
bits_per_raw_sample: 0
    
codec_id: 0x0 (NONE)
    
codec_tag: 0
    
extradata_size: 0
    
level: -99
    
profile: -99
    
sample_rate: 0
    
----- Subtitle Stream ----------
    
----------------------------------------
    
stream 5 of 5:
    
----- common ----------
    
bit_rate: 33862
    
bits_per_coded_sample: 0
    
bits_per_raw_sample: 0
    
codec_id: 0x0 (NONE)
    
codec_tag: 0
    
extradata_size: 0
    
level: -99
    
profile: -99
    
sample_rate: 0
    
----- Subtitle Stream ----------

  • How to play video file with audio with DearPyGUI (Python) ?

    1er mars 2023, par Vi Tiet

    I'm using DearPyGUI to make a simple media player that can play video file (mp4, etc.) together with it's audio. The pre-requisite is that DearPyGUI is a must, however video feature will not exist until v2.0, which is still far in the future.

    


    Currently, I can only render the frames using OpenCV library for Python, however, the problem is how can I play the audio as well as play it in sync with the output video frames ?

    


    For context, I'm quite new to Python, and I don't know much about video and audio streaming, but I've thought of some approaches to this problem by looking through help posts online (However, I still have no idea how I can implement any of these seamlessly) :

    


      


    1. OpenCV for video frames, and audio ??? some libraries like ffmpeg-python or miniaudio to play sound... (How...?)

      


      2. 


    2. Extract video frames and audio here and then use the raw data to play it (How...?)

      


      3. 


    3. This example here is pretty close to what I want excluding the playing video and audio part, but I have no idea where to go from there. The video stream and the audio stream are instances of ffmpeg.nodes.FilterableStream, and they appear to hold addresses to somewhere. (No idea...)

      


      4. 


    4. Another very close idea is using ffpyplayer I was able to get the video frame. However, the below code yields a blueish purple color tint to the video, and the frame rate is very slow compared to original (So close...)

      


      5. 


    


    import time
import numpy as np
import cv2 as cv
from ffpyplayer.player import MediaPlayer


# https://github.com/Kazuhito00/Image-Processing-Node-Editor/blob/main/node_editor/util.py 
def cv2dpg(frame): 

    data = cv.resize(frame, (VIDEO_WIDTH, VIDEO_HEIGHT))
    data = np.flip(frame, 2)
    data = data.ravel()
    data = np.asfarray(data, dtype=np.float32)

    return np.true_divide(data, 255.0)


# https://stackoverflow.com/questions/59611075/how-would-i-go-about-playing-a-video-stream-with-ffpyplayer
# https://matham.github.io/ffpyplayer/examples.html#examples
def play_video(loaded_file_path):

    global player, is_playing
    player = MediaPlayer(loaded_file_path)

    while is_playing:

        frame, val = player.get_frame()

        if val == 'eof':
            is_playing = False
            break

        elif not frame:
            time.sleep(0.01)

        elif val != 'eof' and frame is not None:
            img, t = frame
            w = img.get_size()[0]
            h = img.get_size()[1]
            cv_mat = np.uint8(np.asarray(list(img.to_bytearray()[0])).reshape((h, w, 3)))
            texture_data = cv2dpg(cv_mat)
            dpg.set_value(VIDEO_CANVAS_TAG, texture_data)

    dpg.set_value(VIDEO_CANVAS_TAG, DEFAULT_VIDEO_TEXTURE)


    


    I still need to do more research, but any pointer to somewhere good to start off (either handling raw data or using different libraries) would be greatly appreciated !

    


    EDIT :
For more context, I'm using raw texture like this example of DearPyGUI official documentation to render the video frames that were extracted in the while loop.

    


  • Undefined symbol despite libraries being linked

    17 septembre 2020, par Areopag

    currently I'm trying to write a JNI function using ffmpeg features, but when I'm trying to run my java executable after a clean compile I get the following error :

    


    /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java: symbol lookup error: /lib/libmediaserv_ffmpeg.so: undefined symbol: _Z19avformat_open_inputPP15AVFormatContextPKcP13AVInputFormatPP12AVDictionary


    


    I can't figure out why ffmpeg is not linked correctly.

    


    mediaserv_ffmpeg.cpp :

    


    #include <iostream>&#xA;#include <libavformat></libavformat>avformat.h>&#xA;#include <libavutil></libavutil>avutil.h>&#xA;&#xA;JNIEXPORT jobject JNICALL Java_mediaserv_ffmpeg_getMetadata&#xA;        (JNIEnv* env, jclass cls, jstring path) { ... }&#xA;</iostream>

    &#xA;

    What I've tried so far is inspecting libmediaserv_ffmpeg.so :

    &#xA;

     nm libmediaserv_ffmpeg.so --format=sysv | grep avformat&#xA;_Z19avformat_open_inputPP15AVFormatContextPKcP13AVInputFormatPP12AVDictionary|                |   U  |            NOTYPE|                |     |*UND*&#xA;_Z20avformat_close_inputPP15AVFormatContext|                |   U  |            NOTYPE|                |     |*UND*&#xA;_Z25avformat_find_stream_infoP15AVFormatContextPP12AVDictionary|                |   U  |            NOTYPE|                |     |*UND*&#xA;

    &#xA;

    Which, I think, is just another way of saying that there are undefined symbols in the .so file.

    &#xA;

    The commands used to build the lib (taken from make VERBOSE=1) :

    &#xA;

    /usr/bin/c&#x2B;&#x2B;  -Dmediaserv_ffmpeg_EXPORTS -I/usr/lib/jvm/java-11-openjdk-amd64/include -I/usr/lib/jvm/java-11-openjdk-amd64/include/linux -I/mnt/g/Workspace/mediaserv/third-party/ffmpeg  -fPIC   -std=gnu&#x2B;&#x2B;1z -o CMakeFiles/mediaserv_ffmpeg.dir/mediaserv_ffmpeg.cpp.o -c /mnt/g/Workspace/mediaserv/third-party/mediaserv_ffmpeg.cpp&#xA;/usr/bin/c&#x2B;&#x2B; -fPIC   -shared -Wl,-soname,libmediaserv_ffmpeg.so -o /mnt/g/Workspace/mediaserv/build/libs/libmediaserv_ffmpeg.so CMakeFiles/mediaserv_ffmpeg.dir/mediaserv_ffmpeg.cpp.o  -Wl,-rpath,/usr/lib/jvm/java-11-openjdk-amd64/lib:/usr/lib/jvm/java-11-openjdk-amd64/lib/server:/mnt/g/Workspace/mediaserv/third-party/ffmpeg/libavutil:/mnt/g/Workspace/mediaserv/third-party/ffmpeg/libavformat /usr/lib/jvm/java-11-openjdk-amd64/lib/libjawt.so /usr/lib/jvm/java-11-openjdk-amd64/lib/server/libjvm.so ../ffmpeg/libavutil/libavutil.so ../ffmpeg/libavformat/libavformat.so&#xA;

    &#xA;

    I've already tried to seek for errors in GCC's trace option for the linker and it lists me which libraries it tries to link / is linking but the result stays the same.

    &#xA;

    /usr/bin/ld: mode elf_x86_64&#xA;/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/crti.o&#xA;/usr/lib/gcc/x86_64-linux-gnu/7/crtbeginS.o&#xA;CMakeFiles/mediaserv_ffmpeg.dir/mediaserv_ffmpeg.cpp.o&#xA;/usr/lib/jvm/java-11-openjdk-amd64/lib/libjawt.so&#xA;/usr/lib/jvm/java-11-openjdk-amd64/lib/server/libjvm.so&#xA;../ffmpeg/libavutil/libavutil.so&#xA;../ffmpeg/libavformat/libavformat.so&#xA;-lstdc&#x2B;&#x2B; (/usr/lib/gcc/x86_64-linux-gnu/7/libstdc&#x2B;&#x2B;.so)&#xA;/lib/x86_64-linux-gnu/libm.so.6&#xA;/lib/x86_64-linux-gnu/libmvec.so.1&#xA;libgcc_s.so.1 (/usr/lib/gcc/x86_64-linux-gnu/7/libgcc_s.so.1)&#xA;/lib/x86_64-linux-gnu/libc.so.6&#xA;/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2&#xA;/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2&#xA;libgcc_s.so.1 (/usr/lib/gcc/x86_64-linux-gnu/7/libgcc_s.so.1)&#xA;/usr/lib/gcc/x86_64-linux-gnu/7/crtendS.o&#xA;/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/crtn.o&#xA;

    &#xA;

    CMakeLists.txt :

    &#xA;

    cmake_minimum_required(VERSION 3.17)&#xA;project(mediaserv_ffmpeg)&#xA;&#xA;set(CMAKE_CXX_STANDARD 17)&#xA;set(BUILD_SHARED_LIBS ON)&#xA;add_library(${PROJECT_NAME} SHARED mediaserv_ffmpeg.cpp mediaserv_ffmpeg.h)&#xA;&#xA;find_package(JNI REQUIRED)&#xA;&#xA;find_path(AVUTIL_INCLUDE_DIR libavutil/avutil.h HINTS ffmpeg REQUIRED)&#xA;find_library(AVUTIL_LIBRARY avutil HINTS ${PROJECT_SOURCE_DIR}/ffmpeg/libavutil PATHS REQUIRED)&#xA;&#xA;find_path(AVFORMAT_INCLUDE_DIR libavformat/avformat.h HINTS ffmpeg REQUIRED)&#xA;find_library(AVFORMAT_LIBRARY avformat HINTS ${PROJECT_SOURCE_DIR}/ffmpeg/libavformat REQUIRED)&#xA;&#xA;target_include_directories(${PROJECT_NAME} PRIVATE ${JNI_INCLUDE_DIRS} ${AVUTIL_INCLUDE_DIR} ${AVFORMAT_INCLUDE_DIR})&#xA;&#xA;target_link_libraries(${PROJECT_NAME} ${JNI_LIBRARIES} ${AVUTIL_LIBRARY} ${AVFORMAT_LIBRARY})&#xA;

    &#xA;

    Neither ffmpeg taken from the official ubuntu bionic repository nor a self-compiled version with configure --enable-shared works for me.

    &#xA;

    Where is my mistake or what could I still inspect ?

    &#xA;

    Thanks in advance.

    &#xA;

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