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  • MediaSPIP v0.2

    21 juin 2013, par

    MediaSPIP 0.2 est la première version de MediaSPIP stable.
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    Le fichier zip ici présent contient uniquement les sources de MediaSPIP en version standalone.
    Comme pour la version précédente, il est nécessaire d’installer manuellement l’ensemble des dépendances logicielles sur le serveur.
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Sur d’autres sites (9285)

  • How to create video using avcodec from jpeg images of type OpenCV::Mat ?

    23 juillet 2015, par theateist

    I have colored jpeg images of OpenCV::Mat type and I create from them video using avcodec. The video that I get is upside-down, black & white and each row of each frame is shifted and I got diagonal line. What could be the reason for such output ?
    Follow this link to watch the video I get using avcodec.
    I’m using acpicture_fill function to create avFrame from cv::Mat frame !

    P.S.
    Each cv::Mat cvFrame has width=810, height=610, step=2432
    I noticed that avFrame (that is filled by acpicture_fill) has linesize[0]=2430
    I tried manually setting avFrame->linesizep0]=2432 and not 2430 but it still didn’t helped.

    ======== CODE =========================================================

    AVCodec *encoder = avcodec_find_encoder(AV_CODEC_ID_H264);
    
AVStream *outStream = avformat_new_stream(outContainer, encoder);
    
avcodec_get_context_defaults3(outStream->codec, encoder);
    

    
outStream->codec->pix_fmt = AV_PIX_FMT_YUV420P;
    
outStream->codec->width = 810;
    
outStream->codec->height = 610;
    
//...
    

    
SwsContext *swsCtx = sws_getContext(outStream->codec->width, outStream->codec->height, PIX_FMT_RGB24,
    
                                    outStream->codec->width, outStream->codec->height,  outStream->codec->pix_fmt, SWS_BICUBIC, NULL, NULL, NULL);
    

    
for (uint i=0; i < frameNums; i++)
    
{
    
    // get frame at location I using OpenCV
    
    cv::Mat cvFrame;
    
    myReader.getFrame(cvFrame, i); 
    
    cv::Size frameSize = cvFrame.size();    
    
    //Each cv::Mat cvFrame has  width=810, height=610, step=2432
    

    

    
1.  // create AVPicture from cv::Mat frame
    
2.  avpicture_fill((AVPicture*)avFrame, cvFrame.data, PIX_FMT_RGB24, outStream->codec->width, outStream->codec->height);
    
3avFrame->width = frameSize.width;
    
4.  avFrame->height = frameSize.height;
    

    
    // rescale to outStream format
    
    sws_scale(swsCtx, avFrame->data, avFrame->linesize, 0, outStream->codec->height, avFrameRescaledFrame->data, avFrameRescaledFrame ->linesize);
    
encoderRescaledFrame->pts=i;
    
avFrameRescaledFrame->width = frameSize.width;
    
    avFrameRescaledFrame->height = frameSize.height;
    

    
av_init_packet(&avEncodedPacket);
    
    avEncodedPacket.data = NULL;
    
    avEncodedPacket.size = 0;
    

    
    // encode rescaled frame
    
    if(avcodec_encode_video2(outStream->codec, &avEncodedPacket, avFrameRescaledFrame, &got_frame) < 0) exit(1);
    
    if(got_frame)
    
    {
    
        if (avEncodedPacket.pts != AV_NOPTS_VALUE)
    
            avEncodedPacket.pts =  av_rescale_q(avEncodedPacket.pts, outStream->codec->time_base, outStream->time_base);
    
        if (avEncodedPacket.dts != AV_NOPTS_VALUE)
    
            avEncodedPacket.dts = av_rescale_q(avEncodedPacket.dts, outStream->codec->time_base, outStream->time_base);
    

    
        // outContainer is "mp4"
    
        av_write_frame(outContainer, & avEncodedPacket);
    

    
        av_free_packet(&encodedPacket);
    
    }
    
}

    UPDATED

    As @Alex suggested I changed the lines 1-4 with the code below

    int width = frameSize.width, height = frameSize.height; 
    
avpicture_alloc((AVPicture*)avFrame, AV_PIX_FMT_RGB24, outStream->codec->width, outStream->codec->height);
    
for (int h = 0; h < height; h++)
    
{
    
     memcpy(&(avFrame->data[0][h*avFrame->linesize[0]]), &(cvFrame.data[h*cvFrame.step]), width*3);
    
}

    The video (here) I get now is almost perfect. It’s NOT upside-down, NOT black & white, BUT it seems that one of the RGB components is missing. Every brown/red colors became blue (in original images it should be vice-verse).
    What could be the problem ? Could rescaling(sws_scale) to AV_PIX_FMT_YUV420P format causes this ?

  • ffmpeg convert wma to mp3 in iOS

    24 janvier 2014, par Albert Zhang

    I want to convert a WMA file to MP3 in iOS. And I have successfully parse the WMA stream to AVFrame through learning the sample code here : http://www.inb.uni-luebeck.de/ boehme/using_libavcodec.html
    But next I don't know how to convert the AVFrame to MP3 file, and I have tried the code like this but it does not work :

    AVCodecContext *outCodecContext = NULL;
    
AVCodec *pCodec = avcodec_find_decoder(AV_CODEC_ID_MP3);
    
if(pCodec == NULL){
    
    fprintf(stderr, "out avcodec_find_decoder error\n");
    
    exit(1);
    
}
    

    
AVCodecContext *pCodecCtx = avcodec_alloc_context3(pCodec);
    

    
if(pCodecCtx == NULL){
    
    fprintf(stderr, "out avcodec_alloc_context3 error\n");
    
    exit(1);
    
}
    

    
if(avcodec_open2(pCodecCtx, pCodec, NULL) < 0){
    
    fprintf(stderr, "out avcodec_open error\n");
    
    exit(1);
    
}
    
outCodecContext = pCodecCtx;
    

    

    
do{
    
    AVPacket packet;
    
    if(av_read_frame(pFormatCtx, &packet) < 0){
    
        break;
    
    }
    

    
    int got_frame_ptr;
    

    
    if(packet.stream_index==videoStream)
    
    {   
    
        avcodec_decode_audio4(pCodecCtx, pFrame, &got_frame_ptr, &packet);
    
        if(got_frame_ptr)
    
        {
    
            AVPacket outPacket;
    
            int out_got_packet_ptr;
    
            avcodec_encode_audio2(outCodecContext, &outPacket, pFrame, &out_got_packet_ptr);
    

    
            [finalData appendBytes:outPacket.data length:outPacket.size];
    
            NSLog(@"finalData len: %d", [finalData length]);
    
        }
    
    }
    
    av_free_packet(&packet);
    

    
}while(true);
    

    
NSString *svfp = [getAppDocumentDirectory() stringByAppendingPathComponent:@"finalData"];
    
[finalData writeToFile:svfp atomically:YES];

    I always get a message in the console :

    [mp3 @ 0xa393200] nb_samples (12288) != frame_size (0) (avcodec_encode_audio2)

    Any one can help ? Thanks.

  • bash script to install / update ffmpeg static builds

    1er mars 2017, par Joakim

    Hi I’m trying to make my first "real" bash script to do some real work than can be executed both manually and through cron jobs.

    The script should download and install the ffmpeg-static-build from https://johnvansickle.com/ffmpeg

    Here is what I’ve got so far :

    #!/bin/bash
    
# Still to come, see if the script runs with root privileges else exit
    
#Download FFMPEG static daily build and it's md5
    
cd ~
    
wget https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz | tar -xf
    
#wget https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz.md5
    
curl -L https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz.md5 | tar -xf | tee -a https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz | cut -d\  -f1 | md5sum > md5sum.txt
    

    

    
#Chech the md5 is currect
    
#md5sum -c MD5SUMS
    
file1="md5sum.txt"
    
file2="ffmpeg-git-64bit-static.tar.xz.md5"
    

    
if ! cmp --silent "$file1" "$file2"; then
    
    echo "md5sum doesn't match...\n exit" >&2
    
    exit 1
    
fi
    

    

    
#tar -xf ffmpeg-*.tar.xz
    
cp ffmpeg-*-static/ff* /usr/bin/
    
cp ffmpeg-*-static/ff* /usr/local/bin/
    
cp ffmpeg-*-static/qt-faststart /usr/bin/
    
cp ffmpeg-*-static/qt-faststart /usr/local/bin/
    
# Consider change second location to use ln -s
    
# Remove downloads and do some clean up
    

    
rm -fr ffmpeg-*
    

    
#EOF

    As you can see in the script i would like to add the md5sum check but it fails (got the md5sum check part from Compare md5 sums in bash script)

    If i remove the md5sum part the script is working, but right now the script fails at the | tar -xf | part with this code

    2017-02-28 00:10:24 (617 KB/s) - ‘ffmpeg-git-64bit-static.tar.xz’ saved [17564756/17564756]
    

    
tar: option requires an argument -- 'f'
    
Try 'tar --help' or 'tar --usage' for more information.
    
tee: 'https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz': No such file or directory
    
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
    
                                 Dload  Upload   Total   Spent    Left  Speed
    
100    65  100    65    0     0     87      0 --:--:-- --:--:-- --:--:--    87
    
(23) Failed writing body
    
md5sum doesn't match...
    
 exit

    As this is my first, I would appreciate any "I’m 4 years old" advices and why

    update

    Have made some changes to the script based on the suggestions in this thread, but my problem is I have no output what so ever at this state :( So I think it’s time to ask for the next clue

    #!/bin/bash
    

    
# version 0.3z
    

    
## Download FFMPEG static daily build and it's md5
    
## 
    
## To make this script working you might need to change the below values
    
## based on whether you are using a 32bit or 64 bit OS
    
## to obtain the right links you have to have a look @ https://johnvansickle.com/ffmpeg/
    
## and then change those below
    
## 
    
## If you are running on a shared server or dowsn't have root priviliges you might need to uncomment
    
## point 5.
    

    

    
# a "~" means running users home folder :) and should be different from destination dir
    
download_dir=~
    

    
# as this can change if the ffmpeg is to be stored on ex. shared server
    
dest_dir=/usr/bin/
    

    
# The version it equal the filename from above link
    
version=ffmpeg-git-64bit-static.tar.xz
    

    
## Do not change anything below here!!
    
source_url=https://johnvansickle.com/ffmpeg/builds/${version}
    
md5_url=https://johnvansickle.com/ffmpeg/builds/${version}.md5
    

    
# Still to come, see if the script runs with write privileges else exit
    

    
# 1. Can we enter download directory else exit
    
cd ${download_dir} ||
    

    
        printf "%s\n" "You can't enter this folder.\nPlease chage download_dir in this script..." >&2
    
        exit 1
    

    
# 2. Check the md5 is correct or have changed from last check
    
## instead of downloading ffmpeg-git-64bit-static.tar.xz every time,
    
## regardless if it is new or not, I recommend only downloading it
    
## if the md5 does not match. Would save John some bandwidth at least
    
## thx for the idea to @LordNeckbeard
    

    

    

    
## So somehow i'll guess some sed or grep only first part is nessesary :(
    
## This is getting more advance than expected for a first time script :/
    

    
if ! diff <(md5sum ${version}) <(curl -s ${md5_url})
    

    
    then
    
        printf "%s\n" "md5sum doesn't match...\n
    
                        Downloading new version" >&2
    
        rm -f ${version} >&2
    
        curl ${source_url} -o ${download_dir}/${version} >&2
    
        #exit 2
    

    
    elif
    
        diff <(md5sum ${version}) <(curl -s ${md5_url})
    
        printf "%s\n" "Nothing new to download" >&2
    
      exit 3
    
fi
    

    
# 3. untar
    
tar -xf ffmpeg-git-*-static.tar.xz
    

    
# 4. Move builds to destination directories
    

    
mv ${download_dir}/ffmpeg-*-static/ff* ${dest_dir}/
    
mv ${download_dir}/ffmpeg-*-static/qt-faststart ${dest_dir}/
    

    
# 5. Make soft links to static builds
    
ln -sfn ${dest_dir}/qt-faststart /usr/local/bin/qt-faststart
    
ln -sfn ${dest_dir}/ffmpeg /usr/local/bin/ffmpeg
    
ln -sfn ${dest_dir}/ffmpeg-10bit /usr/local/bin/ffmpeg-10bit
    
ln -sfn ${dest_dir}/ffprobe /usr/local/bin/ffprobe
    
ln -sfn ${dest_dir}/ffserver /usr/local/bin/ffserver
    

    
# Remove unzipped folder to do some clean up
    

    
rm -fr ffmpeg-git-*-static/
    

    
#EOF

    note : do to some more in depth answering of why not compile from source :
    1. This precompiled is usable on all Linux variations, despite distro and version
    2. It usable on shared hosting servers with ssh access

    UPDATE 2

        #!/bin/bash
    

    
# version 0.4z
    

    
## Download FFMPEG static daily build and it's md5
    
## 
    
## To make this script working you might need to change the below values
    
## based on whether you are using a 32bit or 64 bit OS
    
## to obtain the right links you have to have a look @ https://johnvansickle.com/ffmpeg/
    
## and then change those below
    
## 
    
## Finished and working script should be distributed under GPLv3: free as in freedom
    
## 
    
## If you are running on a shared server or dowsn't have root priviliges you might need to uncomment
    
## point 5.
    

    

    
# a "~" means running users home folder :) and should be different from destination dir
    
download_dir=~
    

    
# as this can change if the ffmpeg is to be stored on ex. shared server
    
dest_dir=/usr/bin/
    

    
# The version it equal the filename from above link
    
version=ffmpeg-git-64bit-static.tar.xz
    

    
## Do not change anything below here!!
    
source_url=https://johnvansickle.com/ffmpeg/builds/${version}
    
md5="curl -s https://johnvansickle.com/ffmpeg/builds/${version}.md5"
    

    
# Still to come, see if the script runs with write privileges else exit
    

    
# 1. Can we enter download directory else exit
    
cd ${download_dir} || 
    
        printf "%s\n" "You can't enter this folder.\nPlease chage download_dir in this script..." >&2
    
        exit 1
    

    
# 2. Check the md5 is correct or have changed from last check
    
## instead of downloading ffmpeg-git-64bit-static.tar.xz every time,
    
## regardless if it is new or not, I recommend only downloading it
    
## if the md5 does not match. Would save John some bandwidth at least
    
## thx for the idea to @LordNeckbeard
    

    
## This is getting more advance than expected for a first time script :/
    

    
if diff <(md5sum ${version}) <(${md5})
    

    
    then
    
        printf "%s\n" "No new version availeble" >&2
    
        exit 1
    

    
elif ! diff <(md5sum ${version}) <(${md5})
    
    then
    
        rm -f ${version}
    
        curl ${source_url} > ${version}
    
        exit 0
    

    
        #only proceed if downloaded version match it's md5
    
        if ! diff <(md5sum ${version}) <(${md5})
    
            then
    
            rm -f ${version}
    
            printf "%s\n" "Downloaded version is damaged, try later\ndamaged version have been deleted" >&2
    
            exit 1
    
        fi
    

    
            # 3. untar
    
            tar -xf ffmpeg-git-*-static.tar.xz
    

    
            # 4. Move builds to destination directories
    
            mv ${download_dir}/ffmpeg-*-static/ff* ${dest_dir}/
    
            mv ${download_dir}/ffmpeg-*-static/qt-faststart ${dest_dir}/
    

    
            # 5. Make soft links to static builds
    
            ln -sfn ${dest_dir}/qt-faststart /usr/local/bin/qt-faststart
    
            ln -sfn ${dest_dir}/ffmpeg /usr/local/bin/ffmpeg
    
            ln -sfn ${dest_dir}/ffmpeg-10bit /usr/local/bin/ffmpeg-10bit
    
            ln -sfn ${dest_dir}/ffprobe /usr/local/bin/ffprobe
    
            ln -sfn ${dest_dir}/ffserver /usr/local/bin/ffserver
    

    
            # Remove unzipped folder to do some clean up
    
            rm -fr ffmpeg-git-*-static/
    
            printf "%s\n" "Going to install new version" >&2
    
            exit 1
    
fi
    
#EOF

    But still having some issues :(

    1. Running this script returns : a blanc shell, but I’ve expected one of the printf statements
    2. When I’m trying to narrow down the problem and going back to basic and trying to run the script with only the "if" part it fails with 44 : Syntax error : "(" unexpected

    3. running the very same "if" part typed directly into the shell/terminal itself it’s all happy !!
      if diff <(md5sum ffmpeg-git-64bit-static.tar.xz) <(curl -s "https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz.md5"); then printf "%s\n" "No new version availeble" >&2; elif ! diff <(md5sum ffmpeg-git-64bit-static.tar.xz) <(curl -s "https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz.md5"); then rm -f ffmpeg-git-64bit-static.tar.xz; curl https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz > ffmpeg-git-64bit-static.tar.xz; printf "%s\n" "Going to install new version" >&2; fi

    4. I’m confused

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