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  • Submit bugs and patches

    13 avril 2011

    Unfortunately a software is never perfect.
    If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
    If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
    You may also (...)

  • Gestion des droits de création et d’édition des objets

    8 février 2011, par

    Par défaut, beaucoup de fonctionnalités sont limitées aux administrateurs mais restent configurables indépendamment pour modifier leur statut minimal d’utilisation notamment : la rédaction de contenus sur le site modifiables dans la gestion des templates de formulaires ; l’ajout de notes aux articles ; l’ajout de légendes et d’annotations sur les images ;

  • Diogene : création de masques spécifiques de formulaires d’édition de contenus

    26 octobre 2010, par

    Diogene est un des plugins ? SPIP activé par défaut (extension) lors de l’initialisation de MediaSPIP.
    A quoi sert ce plugin
    Création de masques de formulaires
    Le plugin Diogène permet de créer des masques de formulaires spécifiques par secteur sur les trois objets spécifiques SPIP que sont : les articles ; les rubriques ; les sites
    Il permet ainsi de définir en fonction d’un secteur particulier, un masque de formulaire par objet, ajoutant ou enlevant ainsi des champs afin de rendre le formulaire (...)

Sur d’autres sites (7145)

  • FFMPEG : How to reduce black sides in a vertical video

    2 juin 2016, par hari92114

    I’m using FFMPEG to rotate a vertical video using the below command

    ffmpeg -i input.mp4 -vf 'transpose=1,scale=-1:1080,pad=1920:1080:656:0,setsar=1' -metadata:s:v:0 rotate=0  output.mp4

    While doing the playback ,most of the screen is occupied by black sides which FFMPEG has added.

    Output image : roated-video

    Is there any provision to reduce them ?

  • H.264 muxing to MP4 from CCTV (HW) encoder using ffmpeg library in C / C++, how to fetch AVCodecContext::extradata

    26 mai 2016, par Dom

    I am trying to mux a video to mp4 file from packets received via SDK API of CCTV camera. The stream from CCTV seems to consist of packets of h264 I and P-frames only (no B-frames).

    The problem is, that the file is not playable in Daum PotPlayer when I leave the AVCodecContext::extradata empty, however, I can play the file in VLC. If I feed the extra data (probably not correctly - I just copy the first 50 bytes from the packet received from the HW encoder), the file is playable in PotPlayer, but not in VLC.

    I do not know, how to prepare the extradata properly.

    The code below shows the muxing.

    void WriteVideo()
    
{
    
    AVFormatContext* formatContext = nullptr;
    
    AVStream* stream = nullptr;
    

    
    int ret = 0;
    

    
    ret = avformat_alloc_output_context2(&formatContext, nullptr, "mp4", OUTPUT_V_FILE_NAME);
    
    if (ret < 0)
    
    {
    
        fprintf(stderr, "Error occurred when allocating output context: %d\n", ret);
    
        return;
    
    }
    

    
    stream = avformat_new_stream(formatContext, nullptr);
    
    if (!stream)
    
    {
    
        avformat_free_context(formatContext);
    
        formatContext = nullptr;
    
        fprintf(stderr, "Error occurred creating new stream");
    
        return;
    
    }
    

    
    stream->codec->codec_tag = 0;
    

    
    if (formatContext->oformat->flags & AVFMT_GLOBALHEADER)
    
    {
    
        stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
    
    }
    

    

    
    stream->codec->codec_type = AVMEDIA_TYPE_VIDEO;
    
    stream->codec->codec_id = AV_CODEC_ID_H264;
    
    stream->codec->pix_fmt = AV_PIX_FMT_YUV420P;
    
    stream->codec->bit_rate = 4096000; // 8192000; // 4096000; // 384000;
    
    stream->codec->width = 1920; // 352
    
    stream->codec->height = 1080; // 288
    
    stream->codec->gop_size = 50;
    

    
    AVRational tb;
    
    tb.num = 1;
    
    tb.den = 25;
    
    stream->codec->time_base = tb;
    
    //stream->codec->field_order = AVFieldOrder::AV_FIELD_UNKNOWN;
    
    //stream->codec->color_primaries = AVColorPrimaries::AVCOL_PRI_BT470BG;
    
    //stream->codec->color_trc = AVColorTransferCharacteristic::AVCOL_TRC_GAMMA22;
    
    //stream->codec->colorspace = AVColorSpace::AVCOL_SPC_BT470BG;
    
    //stream->codec->chroma_sample_location = AVChromaLocation::AVCHROMA_LOC_CENTER;
    
    AVRational aratio;
    
    aratio.num = 1;
    
    aratio.den = 1;
    
    stream->codec->sample_aspect_ratio = aratio;
    
    // stream->codec->delay = 0;
    
    // stream->codec->color_range = AVColorRange::AVCOL_RANGE_MPEG;
    

    
    av_dump_format(formatContext, 0, formatContext->filename, 1);
    

    
    if (!(formatContext->oformat->flags & AVFMT_NOFILE))
    
    {
    
        if (avio_open(&formatContext->pb, formatContext->filename, AVIO_FLAG_WRITE) < 0)
    
        {
    
            avformat_free_context(formatContext);
    
            formatContext = nullptr;
    
            fprintf(stderr, "Error occurred when opening output file.");
    
            return;
    

    
        }
    
    }
    

    
    avformat_write_header(formatContext, nullptr);
    

    
    int frameIdx = 0;
    
    int pts = 0;
    
    int dts = 0;
    
    int pkt_pos = 0;
    
    int size = static_cast<int>(tmpRawFrameBuffer.size());
    

    
    AVPacket pkt = { 0 };
    
    av_init_packet(&amp;pkt);
    

    
    while (frameIdx &lt; size)
    
    {
    
        pkt.data = tmpRawFrameBuffer[frameIdx];
    
        pkt.size = tmpRawFrameSizes[frameIdx];
    

    
        // debug purphose start
    
        FILE* f;
    
        char filename[MAX_PATH];
    
        sprintf_s(filename, MAX_PATH, OUTPUT_PACKET_FILE_PATTERN_NAME, frameIdx);
    
        auto err = fopen_s(&amp;f, filename, "wb");
    
        if (err != 0)
    
        {
    
            fprintf(stderr, "Could not open %s\n", OUTPUT_V_FILE_NAME);
    
            exit(1);
    
        }
    

    
        fflush(stdout);
    
        fwrite(pkt.data, 1, pkt.size, f);
    
        fclose(f);
    
        // debug purphose end
    

    
        if (tmpRawFrameTypes[frameIdx] == VIDEO_I_FRAME)
    
        {
    
            pkt.flags |= AV_PKT_FLAG_KEY;
    
            stream->codec->extradata_size = 50;
    
            stream->codec->extradata = (uint8_t*)av_malloc(stream->codec->extradata_size);
    
            memcpy(stream->codec->extradata, pkt.data, stream->codec->extradata_size);
    
        }
    
        pkt.pts = pts++;
    
        pkt.dts = dts++;
    
        /* rescale output packet timestamp values from codec to stream timebase */
    
        // av_packet_rescale_ts(&amp;pkt, stream->codec->time_base, stream->time_base);
    
        pkt.pts = av_rescale_q(pkt.pts, stream->codec->time_base, stream->time_base);
    
        pkt.dts = av_rescale_q(pkt.dts, stream->codec->time_base, stream->time_base);
    
        pkt.duration = 512; // should be calculated (derived from FPS 25, and 12800)
    
        pkt.pos = -1;
    
        pkt.stream_index = stream->index;
    

    
        auto ret = av_write_frame(formatContext, &amp;pkt);
    
        if (ret &lt; 0)
    
        {
    
            fprintf(stderr, "Error while writing video frame: %d\n", ret);
    
            break;
    
        }
    
        av_packet_unref(&amp;pkt);
    
        ++frameIdx;
    
    }
    

    
    if (formatContext)
    
    {
    
        av_write_trailer(formatContext);
    
        if (!(formatContext->oformat->flags &amp; AVFMT_NOFILE)) avio_close(formatContext->pb); // close the output file
    
        avformat_free_context(formatContext);
    
        formatContext = nullptr;
    
    }
    
}
    
</int>

    It seems, the packet from camera (buffered in tmpRawFrameBuffer vector) contains some headers, but I am not able to parse them, I do not understand the meaning of the header.

    The first bytes of the I-frame packet looks like the dump bellow :

    00 00 01 FC 02 19 F0 87 A0 23 73 41 B6 C0 01 00
    
00 00 00 01 67 4D 00 2A 95 A8 1E 00 89 F9 61 00
    
00 03 00 01 00 00 03 00 32 84 00 00 00 01 68 EE 
    
3C 80 00 00 00 01 06 E5 01 19 80 00 00 00 01 65 
    
B8 00 00 08 C7 B0 23 FF F7 80 EE FE 63 B6 FB F5
    
...

    The first bytes of the first P-frame :

    00 00 01 FD E5 24 00 00 00 00 00 01 61 E0 22 27 
    
FF D6 B0 D7 A4 2B 71 6B 19 C5 87 CA BB 8B BF 60 
    
14 59 B4 00 CC BC 0F C0 9E FD 84 B5 FB C4 83 DB 
    
5A 8B 80 FC EC D6 33 6D DE 10 96 6F 31 41 86 5C 
    
D4 22 F9 33 48 5B CE 77 38 17 0C D6 DD C7 6C E8
    
...

    first bytes of next P-frame :

    00 00 01 FD 5E 2F 00 00 00 00 00 01 61 E0 42 2F 
    
FF E7 06 DD 3C 66 26 15 94 93 7A F1 30 8A 6D B8 
    
AD DD 6B 0F 38 89 1D 1B 5C AC 44 6A D7 D1 21 3B 
    
E2 29 F8 14 BB 98 1C 06 4D B6 10 BB DB B9 CA 4F 
    
0B ED B1 A9 06 78 8C EC 06 6D 9F 4F 79 0C 35 5B
    
...

    ...

    begining of next I-frame :

    00 00 01 FC 02 19 F0 87 A2 23 73 41 75 89 01 00 
    
00 00 00 01 67 4D 00 2A 95 A8 1E 00 89 F9 61 00 
    
00 03 00 01 00 00 03 00 32 84 00 00 00 01 68 EE 
    
3C 80 00 00 00 01 06 E5 01 1B 80 00 00 00 01 65 
    
B8 00 00 0F 07 F0 7F F6 6C 69 43 0F F0 28 DF 97
    
...

    Does anybody know, how to fill correctly the extradata ? I just made a copy of first 50 bytes, but it seems, this is not correct.

    Probably the headers are (AUD)(SPS)(PPS)(I-Slice)(PPS)(P-Slice)(PPS)(P-Slice) ... (AUD)(SPS)(PPS)(I-Slice) (http://stackoverflow.com/a/20686267/1699328), however, I do not know, how to extract data for the

    stream->codec->extradata

    I tried to get some inspiration in this post H.264 muxed to MP4 using libavformat not playing back, but I am not able to figure out what are values of spsFrameLen, ppsFrameLen and spsFrame.

    The result of the muxer (first and last bytes of the mp4 file) :

    00 00 00 20 66 74 79 70 69 73 6F 6D 00 00 02 00 
    
69 73 6F 6D 69 73 6F 32 61 76 63 31 6D 70 34 31 
    
00 00 00 08 66 72 65 65 00 26 2E 6D 6D 64 61 74 
    
00 00 00 0D FC 02 19 F0 87 A0 23 73 41 B6 C0 01 
    
00 00 00 00 16 67 4D 00 2A 95 A8 1E 00 89 F9 61 
    
00 00 03 00 01 00 00 03 00 32 84 00 00 00 04 68 
    
EE 3C 80 00 00 00 05 06 E5 01 19 80 00 01 C0 87 
    
65 B8 00 00 08 C7 B0 23 FF F7 80 EE FE 63 B6 FB 
    
F5 97 A8 6B 48 39 61 99 FD 99 27 41 F2 78 54 EE 
    
D1 38 8E E8 18 DD 05 E4 BA F4 EB 69 CF 91 5C 34
    
...
    
...
    
...
    
95 B8 D8 D4 C3 AF A1 BA AC 28 F0 D4 D4 7C 48 9A 
    
0C A6 8C 4C 98 00 00 05 1E 6D 6F 6F 76 00 00 00 
    
6C 6D 76 68 64 00 00 00 00 00 00 00 00 00 00 00 
    
00 00 00 03 E8 00 00 13 B0 00 01 00 00 01 00 00 
    
00 00 00 00 00 00 00 00 00 00 01 00 00 00 00 00 
    
00 00 00 00 00 00 00 00 00 00 01 00 00 00 00 00 
    
00 00 00 00 00 00 00 00 00 40 00 00 00 00 00 00 
    
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    
00 00 00 00 00 00 00 00 02 00 00 04 48 74 72 61 
    
6B 00 00 00 5C 74 6B 68 64 00 00 00 03 00 00 00 
    
00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 13 
    
B0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    
00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 
    
00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 
    
00 40 00 00 00 07 80 00 00 04 38 00 00 00 00 00 
    
24 65 64 74 73 00 00 00 1C 65 6C 73 74 00 00 00 
    
00 00 00 00 01 00 00 13 B0 00 00 00 00 00 01 00 
    
00 00 00 03 C0 6D 64 69 61 00 00 00 20 6D 64 68 
    
64 00 00 00 00 00 00 00 00 00 00 00 00 00 00 32 
    
00 00 00 FC 00 55 C4 00 00 00 00 00 2D 68 64 6C 
    
72 00 00 00 00 00 00 00 00 76 69 64 65 00 00 00 
    
00 00 00 00 00 00 00 00 00 56 69 64 65 6F 48 61 
    
6E 64 6C 65 72 00 00 00 03 6B 6D 69 6E 66 00 00 
    
00 14 76 6D 68 64 00 00 00 01 00 00 00 00 00 00 
    
00 00 00 00 00 24 64 69 6E 66 00 00 00 1C 64 72 
    
65 66 00 00 00 00 00 00 00 01 00 00 00 0C 75 72 
    
6C 20 00 00 00 01 00 00 03 2B 73 74 62 6C 00 00 
    
00 93 73 74 73 64 00 00 00 00 00 00 00 01 00 00 
    
00 83 61 76 63 31 00 00 00 00 00 00 00 01 00 00 
    
00 00 00 00 00 00 00 00 00 00 00 00 00 00 07 80 
    
04 38 00 48 00 00 00 48 00 00 00 00 00 00 00 01 
    
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    
00 18 FF FF 00 00 00 2D 61 76 63 43 01 4D 00 2A 
    
FF E1 00 16 67 4D 00 2A 95 A8 1E 00 89 F9 61 00 
    
00 03 00 01 00 00 03 00 32 84 01 00 04 68 EE 3C 
    
80 00 00 00 18 73 74 74 73 00 00 00 00 00 00 00 
    
01 00 00 00 7E 00 00 02 00 00 00 00 1C 73 74 73 
    
73 00 00 00 00 00 00 00 03 00 00 00 01 00 00 00 
    
33 00 00 00 65 00 00 00 34 73 74 73 63 00 00 00 
    
00 00 00 00 03 00 00 00 01 00 00 00 3B 00 00 00 
    
01 00 00 00 02 00 00 00 37 00 00 00 01 00 00 00 
    
03 00 00 00 0C 00 00 00 01 00 00 02 0C 73 74 73 
    
7A 00 00 00 00 00 00 00 00 00 00 00 7E 00 01 C0 
    
C7 00 00 24 EE 00 00 2F 67 00 00 1D 83 00 00 2E 
    
8F 00 00 30 B6 00 00 2F 44 00 00 2F 50 00 00 34 
    
6B 00 00 30 BE 00 00 31 0C 00 00 31 E7 00 00 30 
    
EA 00 00 31 4E 00 00 31 A8 00 00 32 21 00 00 31 
    
E6 00 00 31 B5 00 00 31 14 00 00 31 AF 00 00 31 
    
9D 00 00 33 60 00 00 32 11 00 00 32 4C 00 00 31 
    
F0 00 00 32 91 00 00 43 43 00 00 44 29 00 00 44 
    
EC 00 00 44 20 00 00 44 86 00 00 45 AD 00 00 47 
    
47 00 00 46 9F 00 00 46 D9 00 00 47 BE 00 00 48 
    
CD 00 00 3E 50 00 00 40 98 00 00 41 0E 00 00 40 
    
43 00 00 41 07 00 00 41 BB 00 00 41 FF 00 00 30 
    
5E 00 00 33 C7 00 00 34 B7 00 00 33 F1 00 00 33 
    
0D 00 00 32 DB 00 01 89 86 00 00 3B E1 00 00 3C 
    
55 00 00 3C 64 00 00 3C B7 00 00 3C FD 00 00 3E 
    
54 00 00 3E C5 00 00 3E 1C 00 00 3E 94 00 00 3E 
    
44 00 00 3E D7 00 00 3F CC 00 00 3E D6 00 00 40 
    
00 00 00 40 4D 00 00 40 04 00 00 3F A9 00 00 40 
    
82 00 00 41 0F 00 00 41 64 00 00 41 E5 00 00 42 
    
1E 00 00 42 2C 00 00 42 80 00 00 42 4D 00 00 43 
    
9F 00 00 43 DA 00 00 44 45 00 00 44 21 00 00 44 
    
B7 00 00 45 22 00 00 45 E3 00 00 45 BF 00 00 46 
    
18 00 00 47 4B 00 00 45 05 00 00 47 34 00 00 46 
    
60 00 00 46 97 00 00 46 66 00 00 46 29 00 00 46 
    
38 00 00 47 1D 00 00 47 42 00 00 47 18 00 00 47 
    
13 00 00 46 52 00 00 47 48 00 00 46 F8 00 01 BE 
    
E3 00 00 3F 56 00 00 3B 32 00 00 38 F8 00 00 37 
    
56 00 00 36 2D 00 00 35 DA 00 00 34 6B 00 00 3E 
    
BE 00 00 3E B5 00 00 3F 33 00 00 3F AC 00 00 3F 
    
38 00 00 42 32 00 01 1B DC 00 01 80 50 00 01 14 
    
06 00 00 C2 BB 00 00 96 12 00 00 6D EC 00 00 54 
    
E6 00 00 3A AC 00 00 32 00 00 00 2F 0A 00 00 2D 
    
F1 00 00 1B 7F 00 00 00 1C 73 74 63 6F 00 00 00 
    
00 00 00 00 03 00 00 00 30 00 0F DD AB 00 1F 7D 
    
9E 00 00 00 62 75 64 74 61 00 00 00 5A 6D 65 74 
    
61 00 00 00 00 00 00 00 21 68 64 6C 72 00 00 00 
    
00 00 00 00 00 6D 64 69 72 61 70 70 6C 00 00 00 
    
00 00 00 00 00 00 00 00 00 2D 69 6C 73 74 00 00 
    
00 25 A9 74 6F 6F 00 00 00 1D 64 61 74 61 00 00 
    
00 01 00 00 00 00 4C 61 76 66 35 37 2E 32 33 2E 
    
31 30 30

    Thanks a lot for any advices.

  • How to ffmpeg resize 2.7k DJI Phantom Standard video to 1080p good quality ?

    23 mai 2016, par augre

    ffmpeg -i :

    Duration: 00:01:59.99, start: 0.000000, bitrate: 39988 kb/s
    
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 2704x1520 [SAR 1:1 DAR 169:95], 39984 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    
Metadata:
    
  creation_time   : 2016-05-22 11:04:26
    
  handler_name    : DJI.AVC
    
  encoder         : Dji AVC encoder

    I used :

    ffmpeg -i DJI_0002.MOV -vf scale=1920:1080 DJI_0002FullHD.MOV

    But the output quality is much worse than it should be.

    How to improve the quality ?

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