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  • 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.

  • 11 ways Piwik Analytics helps you to protect your visitors privacy

    11 janvier 2017, par InnoCraft — Community

    At Piwik and at InnoCraft, we think Privacy matters. From the beginning, Piwik has had a strong focus on privacy and ensures the privacy of your visitors and analytics data. As a result, Piwik has been recommended as a privacy-compliant analytics tool for example by the Independent Center for Privacy Protection in Germany (ULD) and by the Center for Data Privacy Protection in France (CNIL). In France, Piwik is the only web analytics tool that does not require Cookie Consent.

    Here are some ways how you can ensure your users and visitors privacy by using Piwik.

    1. You own the data

    Whether you host Piwik on premise yourself, managed on premise by InnoCraft, or whether you use our Piwik cloud, when you use Piwik, YOU keep control of your data and nobody else. This also means you can decide where your data should be located physically.

    2. Anonymized IP addresses

    For better privacy by default, Piwik will not record the full IP address of your visitors because otherwise the browsing history could be easily tracked across several days and even across websites within the same Piwik server. Some countries even require to anonymize the IP address, considered Personally Identifiable Information (PII).

    To change the IP anonymization settings go to “Administration > Privacy”. Optionally, you can use the full IP to still get for example accurate location data.

    3. Delete old visitor logs

    The visitor logs contain information all the collected raw data about every visitor and every action. You can configure Piwik to automatically delete logs from the database. When you delete old logs, only the real time and visitor log reports will no longer work for this old time period, all other aggregated reports will still work.

    For privacy reasons, we highly recommend that you keep the detailed Piwik logs for only 3 to 6 months and delete older log data. This has one other nice side effect : it will free significant database space, which will, in turn, slightly increase performance !

    4. Support Do Not Track preference

    Do Not Track enables users to opt out of any tracking by websites they do not visit, including analytics services, advertising networks, and social platforms. By default, Piwik respects users preference and will not track visitors which have specified “I do not want to be tracked” in their web browsers. Get more information about DoNotTrack.

    To make sure Do Not Track is respected, go to “Administration => Privacy”.

    5. Include an Opt-Out Feature on your website or app

    By embedding the Opt-Out feature in your website, you give your visitors the possibility to opt-out of the tracking. When you go to “Administration > Privacy”, you will be able to copy and paste an HTML Iframe code to embed the opt-out feature for example into your privacy policy page or in your ‘Legal’ page. Your users can then click on a link to opt-out.

    On the Piwik Marketplace there are also some plugins available to customize the Opt-Out experience. For example AjaxOptOut and CustomOptOut.

    6. Disable Live features

    The Real-Time, Visitor Log and Visitor Profile features give you insights into the tracked raw data by showing you details about every visitor and every action they performed. To protect the privacy of your visitors you may decide to prevent access to such features by disabling the “Live” plugin in “Administration => Plugins”. This way only aggregated reports will be shown in your Piwik.

    7. Disable fingerprinting across websites

    By default, when one of your visitors visits several of your websites, Piwik will create a fingerprint for this user that will be different across the websites to increase the visitors’ privacy. You can make sure that this feature is disabled by going to “Administration => Config file” and verifying that the value of “enable_fingerprinting_across_websites” is set to zero.

    8. Disable tracking cookies

    Piwik uses cookies to store some information about visitors between visits. In some countries, the legislation requires websites to provide a way for users to opt-out of all tracking, in particular tracking cookies. You can disable cookies by adding one line in the Piwik Javascript code.

    9. Custom development

    Piwik is an open platform that lets you extend and customize the tracking, the reporting and the Piwik user interface to your needs and to protect your visitors’ privacy the way you want or need it. Learn more in the Piwik Developer Zone. You may also have a look at our Piwik Marketplace where you can find several free and premium features to extend your Piwik.

    10. Transparency

    By default, all information and all collected data in your Piwik server are protected and nobody can access it. However, Piwik allows you to optionally make your collected data public and you can export any Piwik report including the whole dashboard to embed it into your website. This way you can show your users exactly which information you track. When you decide to make reports public, we do our best to protect privacy and automatically hide any Personally Identifiable Information such as the Visitor Profile and we make sure to not show any Visitor IP address and the Visitor ID.

    11. Privacy policy

    When you use Piwik to track your visitors, we recommend to update your Privacy Policy to explain how Piwik is used and what data it gathers. We provide a Privacy Policy template for Piwik users that you can copy on your site.

    Continuous privacy improvements

    We are always interested in improving the privacy. If you miss any feature or have an idea on how to improve the privacy, please let us know.

    More information about all the Piwik features

    If you want to learn more about all the features in Piwik, have a look at our User Guides and FAQ entries.

  • ffmpeg "End mismatch 1" warning, jpeg2000 to avi

    11 avril 2023, par jklebes

    Trying to convert a directory of jpeg2000 grayscale images to a video with ffmpeg, I get warnings

    &#xA;

    [0;36m[jpeg2000 @ 0x55d8fa1b68c0] [0m[0;33mEnd mismatch 1&#xA;

    &#xA;

    (and lots of

    &#xA;

    Last message repeated <n> times&#xA;</n>

    &#xA;

    )

    &#xA;

    The command was

    &#xA;

    ffmpeg -y -r 10 -start_number 1 -i <path>/surface_30///img_000%01d.jp2 -vcodec msmpeg4 -vf scale=1920:-1 -q:v 8 <path>//surface_30///surface_30.avi&#xA;</path></path>

    &#xA;

    The output is

    &#xA;

    ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers&#xA;  built with gcc 7.3.0 (crosstool-NG 1.23.0.449-a04d0)&#xA;  configuration: --prefix=/home/jklebes001/miniconda3 --cc=/tmp/build/80754af9/ffmpeg_1587154242452/_build_env/bin/x86_64-conda_cos6-linux-gnu-cc --disable-doc --enable-avresample --enable-gmp --enable-hardcoded-tables --enable-libfreetype --enable-libvpx --enable-pthreads --enable-libopus --enable-postproc --enable-pic --enable-pthreads --enable-shared --enable-static --enable-version3 --enable-zlib --enable-libmp3lame --disable-nonfree --enable-gpl --enable-gnutls --disable-openssl --enable-libopenh264 --enable-libx264&#xA;  libavutil      56. 31.100 / 56. 31.100&#xA;  libavcodec     58. 54.100 / 58. 54.100&#xA;  libavformat    58. 29.100 / 58. 29.100&#xA;  libavdevice    58.  8.100 / 58.  8.100&#xA;  libavfilter     7. 57.100 /  7. 57.100&#xA;  libavresample   4.  0.  0 /  4.  0.  0&#xA;  libswscale      5.  5.100 /  5.  5.100&#xA;  libswresample   3.  5.100 /  3.  5.100&#xA;  libpostproc    55.  5.100 / 55.  5.100&#xA;[0;36m[jpeg2000 @ 0x55cb44144480] [0m[0;33mEnd mismatch 1&#xA;&#xA;[0m    Last message repeated 1 times&#xA;    Last message repeated 2 times&#xA;    Last message repeated 3 times&#xA;

    &#xA;

    ...

    &#xA;

    Last message repeated 73 times&#xA;&#xA;Input #0, image2, from &#x27;<path>//surface_30///img_000%01d.jp2&#x27;:&#xA;&#xA;  Duration: 00:00:00.20, start: 0.000000, bitrate: N/A&#xA;&#xA;    Stream #0:0: Video: jpeg2000, gray, 6737x4869, 25 tbr, 25 tbn, 25 tbc&#xA;&#xA;Stream mapping:&#xA;&#xA;  Stream #0:0 -> #0:0 (jpeg2000 (native) -> msmpeg4v3 (msmpeg4))&#xA;&#xA;Press [q] to stop, [?] for help&#xA;&#xA;[0;36m[jpeg2000 @ 0x55cb4418e200] [0m[0;33mEnd mismatch 1&#xA;&#xA;[0m[0;36m[jpeg2000 @ 0x55cb441900c0] [0m[0;33mEnd mismatch 1&#xA;</path>

    &#xA;

    ...

    &#xA;

    (about 600 lines of "end mismatch" and "last message repeated" cut)

    &#xA;

    ...

    &#xA;

    [0m[0;36m[jpeg2000 @ 0x55cb4418e8c0] [0m[0;33mEnd mismatch 1&#xA;&#xA;[0mOutput #0, avi, to &#x27;<path>/surface_30///surface_30.avi&#x27;:&#xA;&#xA;  Metadata:&#xA;&#xA;    ISFT            : Lavf58.29.100&#xA;&#xA;    Stream #0:0: Video: msmpeg4v3 (msmpeg4) (MP43 / 0x3334504D), yuv420p, 1920x1388, q=2-31, 200 kb/s, 10 fps, 10 tbn, 10 tbc&#xA;&#xA;    Metadata:&#xA;&#xA;      encoder         : Lavc58.54.100 msmpeg4&#xA;&#xA;    Side data:&#xA;&#xA;      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1&#xA;&#xA;frame=    2 fps=0.8 q=8.0 size=       6kB time=00:00:00.20 bitrate= 227.1kbits/s speed=0.0844x    &#xA;frame=    5 fps=1.7 q=8.0 size=       6kB time=00:00:00.50 bitrate=  90.8kbits/s speed=0.172x    &#xA;frame=    5 fps=1.7 q=8.0 Lsize=     213kB time=00:00:00.50 bitrate=3494.7kbits/s speed=0.172x    &#xA;video:208kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.732246%&#xA;</path>

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    What is the meaning of characters like [0 ;33m here ?

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    I thought it might have something to do with bit depth and color format. Setting -pix_fmt gray had no effect, and indeed the format of the jp2 images is already detected as 8-bit gray.

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    The output .avi exists and seems fine.

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    The line was previously used on jpeg files and works fine on jpeg. With jpeg, the output has the line

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    Input #0, image2, from &#x27;<path>/surface_30///img_000%01d.jpeg&#x27;:&#xA;&#xA;  Duration: 00:00:00.16, start: 0.000000, bitrate: N/A&#xA;&#xA;    Stream #0:0: Video: mjpeg (Baseline), gray(bt470bg/unknown/unknown), 6737x4869 [SAR 1:1 DAR 6737:4869], 25 tbr, 25 tbn, 25 tbc&#xA;&#xA;Stream mapping:&#xA;&#xA;  Stream #0:0 -> #0:0 (mjpeg (native) -> msmpeg4v3 (msmpeg4))&#xA;&#xA;Press [q] to stop, [?] for help&#xA;&#xA;Output #0, avi, to &#x27;<path>/surface_30///surface_30.avi&#x27;:&#xA;&#xA;  Metadata:&#xA;&#xA;    ISFT            : Lavf58.29.100&#xA;&#xA;    Stream #0:0: Video: msmpeg4v3 (msmpeg4) (MP43 / 0x3334504D), yuv420p, 6737x4869 [SAR 1:1 DAR 6737:4869], q=2-31, 200 kb/s, 10 fps, 10 tbn, 10 tbc&#xA;&#xA;    Metadata:&#xA;&#xA;      encoder         : Lavc58.54.100 msmpeg4&#xA;&#xA;    Side data:&#xA;&#xA;      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1&#xA;&#xA;frame=    2 fps=0.0 q=8.0 size=    6662kB time=00:00:00.20 bitrate=272859.9kbits/s speed=0.334x    &#xA;frame=    3 fps=2.2 q=10.0 size=   10502kB time=00:00:00.30 bitrate=286764.2kbits/s speed=0.22x    &#xA;frame=    4 fps=1.9 q=12.3 size=   13574kB time=00:00:00.40 bitrate=277987.7kbits/s speed=0.19x    &#xA;frame=    4 fps=1.4 q=12.3 size=   13574kB time=00:00:00.40 bitrate=277987.7kbits/s speed=0.145x    &#xA;frame=    4 fps=1.4 q=12.3 Lsize=   13657kB time=00:00:00.40 bitrate=279702.3kbits/s speed=0.145x    &#xA;video:13652kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.041926%&#xA;</path></path>

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    detecting mjpeg format and similar, but more detailed format gray(bt470bg/unknown/unknown), 6737x4869 [SAR 1:1 DAR 6737:4869].

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    What is the difference when switching input to jp2 ?

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