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  • Why is a file unplayable in Windows Media Player ?

    21 février 2024, par zhang

    I have written some code to generate a MP4 video. This is a simplified version of the code :

    


    #include <iostream>&#xA;#include <fstream>&#xA;#include <cstdio>&#xA;#include <string>&#xA;#include <list>&#xA;#include &#xA;&#xA;extern "C"&#xA;{&#xA;#include "libavformat/avformat.h"&#xA;#include "libavutil/frame.h"&#xA;#include "libavcodec/avcodec.h"&#xA;#include "libavutil/imgutils.h"&#xA;}&#xA;using namespace std;&#xA;&#xA;const int output_width = 180;&#xA;const int output_height = 320;&#xA;&#xA;int main(int argc, char **argv)&#xA;{&#xA;    AVCodec *output_avc = avcodec_find_encoder_by_name("libx264");&#xA;    if (!output_avc)&#xA;        abort();&#xA;    AVCodecContext *output_cc = avcodec_alloc_context3(output_avc);&#xA;    if (!output_cc)&#xA;        abort();&#xA;&#xA;    output_cc->time_base.num = output_cc->time_base.den = 1;&#xA;    output_cc->pix_fmt = AV_PIX_FMT_YUV420P;&#xA;&#xA;    output_cc->width = output_width;&#xA;    output_cc->height = output_height;&#xA;&#xA;    if (avcodec_is_open(output_cc) == 0)&#xA;    {&#xA;        if (avcodec_open2(output_cc, output_avc, 0) &lt; 0)&#xA;            abort();&#xA;    }&#xA;&#xA;    string outf = "res.mp4";&#xA;    AVFormatContext *output_ctx;&#xA;    avformat_alloc_output_context2(&amp;output_ctx, NULL, NULL, outf.c_str());&#xA;    AVStream *out_stream = avformat_new_stream(output_ctx, 0);&#xA;    out_stream->codecpar->codec_id = AV_CODEC_ID_H264;&#xA;    out_stream->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;&#xA;    out_stream->codecpar->codec_tag = 0;&#xA;    out_stream->codecpar->width = output_width;&#xA;    out_stream->codecpar->height = output_height;&#xA;    out_stream->codecpar->format = AV_PIX_FMT_YUV420P;&#xA;    av_dump_format(output_ctx, 0, outf.c_str(), 1);&#xA;    if (!(output_ctx->oformat->flags &amp; AVFMT_NOFILE))&#xA;    {&#xA;        if (avio_open(&amp;output_ctx->pb, outf.c_str(), AVIO_FLAG_WRITE) &lt; 0)&#xA;            abort();&#xA;    }&#xA;    if (avformat_write_header(output_ctx, NULL) &lt; 0)&#xA;        abort();&#xA;&#xA;    AVPacket packet;&#xA;    AVFrame *frame;&#xA;    int fileCount = 0;&#xA;&#xA;    for (int i = 0; i &lt; 100; i&#x2B;&#x2B;)&#xA;    {&#xA;        frame = av_frame_alloc();&#xA;        frame->width = output_width;&#xA;        frame->height = output_height;&#xA;        frame->format = AV_PIX_FMT_YUV420P;&#xA;        if (av_image_alloc(frame->data, frame->linesize, frame->width, frame->height, AV_PIX_FMT_YUV420P, 32) &lt; 0)&#xA;            abort();&#xA;        frame->pts = 60000 * i;&#xA;        frame->pkt_dts = 60000 * i;&#xA;        if (avcodec_send_frame(output_cc, frame) &lt; 0)&#xA;            abort();&#xA;        av_frame_free(&amp;frame);&#xA;&#xA;        av_new_packet(&amp;packet, 0);&#xA;        while (avcodec_receive_packet(output_cc, &amp;packet) >= 0)&#xA;        {&#xA;            packet.pos = -1;&#xA;            packet.dts = 4500 * fileCount;&#xA;            packet.pts = 4500 * fileCount;&#xA;            packet.duration = 4500;&#xA;            av_write_frame(output_ctx, &amp;packet);&#xA;            av_packet_unref(&amp;packet);&#xA;            av_new_packet(&amp;packet, 0);&#xA;            fileCount&#x2B;&#x2B;;&#xA;        }&#xA;        av_packet_unref(&amp;packet);&#xA;    }&#xA;    avcodec_free_context(&amp;output_cc);&#xA;&#xA;    av_write_trailer(output_ctx);&#xA;    if (output_ctx &amp;&amp; !(output_ctx->oformat->flags &amp; AVFMT_NOFILE))&#xA;        avio_close(output_ctx->pb);&#xA;    avformat_free_context(output_ctx);&#xA;}&#xA;</list></string></cstdio></fstream></iostream>

    &#xA;

    Then, I compiled it (with g&#x2B;&#x2B; encode.cpp -lavcodec -lavformat -lavutil -g and libraries are installed via Ubuntu 20.04 apt) and run it. This is the MP4 file I get (2872 bytes, base64 encoded) :

    &#xA;

    AAAAIGZ0eXBpc29tAAACAGlzb21pc28yYXZjMW1wNDEAAAAIZnJlZQAAB39tZGF0AAAAAWdkAAys&#xA;2UMCnn4QAAADABAAAAMAIPFCmWAAAAABaOvjyyLAAAABBgX//6rcRem95tlIt5Ys2CDZI&#x2B;7veDI2&#xA;NCAtIGNvcmUgMTU1IHIyOTE3IDBhODRkOTggLSBILjI2NC9NUEVHLTQgQVZDIGNvZGVjIC0gQ29w&#xA;eWxlZnQgMjAwMy0yMDE4IC0gaHR0cDovL3d3dy52aWRlb2xhbi5vcmcveDI2NC5odG1sIC0gb3B0&#xA;aW9uczogY2FiYWM9MSByZWY9MyBkZWJsb2NrPTE6MDowIGFuYWx5c2U9MHgzOjB4MTEzIG1lPWhl&#xA;eCBzdWJtZT03IHBzeT0xIHBzeV9yZD0xLjAwOjAuMDAgbWl4ZWRfcmVmPTEgbWVfcmFuZ2U9MTYg&#xA;Y2hyb21hX21lPTEgdHJlbGxpcz0xIDh4OGRjdD0xIGNxbT0wIGRlYWR6b25lPTIxLDExIGZhc3Rf&#xA;cHNraXA9MSBjaHJvbWFfcXBfb2Zmc2V0PS0yIHRocmVhZHM9MTAgbG9va2FoZWFkX3RocmVhZHM9&#xA;MSBzbGljZWRfdGhyZWFkcz0wIG5yPTAgZGVjaW1hdGU9MSBpbnRlcmxhY2VkPTAgYmx1cmF5X2Nv&#xA;bXBhdD0wIGNvbnN0cmFpbmVkX2ludHJhPTAgYmZyYW1lcz0zIGJfcHlyYW1pZD0yIGJfYWRhcHQ9&#xA;MSBiX2JpYXM9MCBkaXJlY3Q9MSB3ZWlnaHRiPTEgb3Blbl9nb3A9MCB3ZWlnaHRwPTIga2V5aW50&#xA;PTI1MCBrZXlpbnRfbWluPTEgc2NlbmVjdXQ9NDAgaW50cmFfcmVmcmVzaD0wIHJjX2xvb2thaGVh&#xA;ZD00MCByYz1jcmYgbWJ0cmVlPTEgY3JmPTIzLjAgcWNvbXA9MC42MCBxcG1pbj0wIHFwbWF4PTY5&#xA;IHFwc3RlcD00IGlwX3JhdGlvPTEuNDAgYXE9MToxLjAwAIAAAAFliIQAF//&#x2B;7oK&#x2B;BTeKk2/DVSCr&#xA;MT4MeFdCVv4gBUyU0LeeB3T/sW2Y2XML/dzzR/1dfS/wWmJ&#x2B;KGm0PX/sHuGpnyAn2gs5wsYABhgA&#xA;WoTf&#x2B;9Y7PDk9QANDAAAAAUGaJGxBf/rtlHe1U64AATcAAAABQZ5CeILfbxYfLVgA1IEAAAABAZ5h&#xA;dEFfe7ECY2ABFwAAAAEBnmNqQV8AAAXdAAAAAUGaaEmoQWiZTAgv//7aplgACJkAAAABQZ6GRREs&#xA;Fv8AAAMDuwAAAAEBnqV0QV8AAAXdAAAAAQGep2pBXwAABdwAAAABQZqsSahBbJlMCCn/pl89fETi&#xA;z77HITCNid5IReE1K1v97aqMUAALuAAAAAFBnspFFSwj//KT/ryYOcNSN&#x2B;trDqIVVMoJuQAAAAEB&#xA;nul0QV/Y3j/sYkAS8AAAAAEBnutqQV/YnLf8lQQC4gAAAAFBmvBLqEIQWyFwE9QE8wCG/4899h7r&#xA;ur/hzq5kViiXU1N/7bVj0xCq2NuW3nBS6YfDQ992r2uqpbMofO1lE5tnQK9JUQ5YGQAAAAFBnw5F&#xA;FSxf9fg4AYHw/MtxZuh3cyjYZEvBAAAAAQGfLXRBX9j1VS/3qogFxQAAAAEBny9qQV/YoOAr/sYk&#xA;AS8AAAABQZs0S6hCEFsgjBdQXMAgp/&#x2B;h1f9/vbVRigABdwAAAAFBn1JFFSwj/wAFJQAAAAEBn3F0&#xA;QV/XxXD/9jEgCXgAAAABAZ9zakFf2CYBX/YxIAl4AAAAAUGbeEuoQhBbI8FVBUwCGf&#x2B;cVtZB6o&#x2B;w&#xA;AAd1AAAAAUGflkUVLF/5hTWAMD4fmW4s3Q7uZRsMiXgAAAABAZ&#x2B;1dEFf2PnD/9jEgCXhAAAAAQGf&#xA;t2pBX9ig4Cv&#x2B;xiQBLwAAAAFBm7xLqEIQWyHwTNBMUAgl/5uKXHNoSDz2kspLKh1/aGf97VTrgABL&#xA;wAAAAAFBn9pFFSwj/wAFJQAAAAEBn/l0QV/Y9mTr/eqiAXEAAAABAZ/7akFf2PyAa/9LVQC4gQAA&#xA;AAFBm&#x2B;BLqEIQWyGwGtQGswCF/40iq4lIKUsvpwcj71B5AACtgQAAAAFBnh5FFSxf&#x2B;YU3S0ZHIuL8&#xA;nYrTAtHfPEvAAAAAAQGePXRBX9guMnX&#x2B;9VEAuIAAAAABAZ4/akFf2KDgK/7GJAEvAAAAAUGaJEuo&#xA;QhBbIbCTQkUAgj&#x2B;ZGG6&#x2B;9qp1wAAl4AAAAAFBnkJFFSwj/wAFJQAAAAEBnmF0QV/Y9mTr/eqiAXEA&#xA;AAABAZ5jakFf2PyAa/9LVQC4gQAAAAFBmmhLqEIQWyFwN1A3MAhf/40jE99QeQAArYEAAAABQZ6G&#xA;RRUsX/X4OAGB8PzLcWbIzTkgw4Q&#x2B;YQAAAAEBnqV0QV/YLjJ1/vVRALiBAAAAAQGep2pBX9ig4Cv&#x2B;&#xA;xiQBLwAAAAFBmqxLqEIQWyGwk0JFAII/mRhuvvaqdcAAJeAAAAABQZ7KRRUsI/8ABSUAAAABAZ7p&#xA;dEFf2PZk6/3qogFxAAAAAQGe62pBX9j8gGv/S1UAuIAAAAABQZrwS6hCEFshcBTUBTMAhP&#x2B;CU2ym&#xA;36ypkZobj4/dQd9&#x2B;Isf9z8aAAKmBAAADkW1vb3YAAABsbXZoZAAAAAAAAAAAAAAAAAAAA&#x2B;gAAAj8&#xA;AAEAAAEAAAAAAAAAAAAAAAABAAAAAAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAQAAAAAAAAAAA&#xA;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAIAAAK7dHJhawAAAFx0a2hkAAAAAwAAAAAAAAAAAAAAAQAA&#xA;AAAAAAj8AAAAAAAAAAAAAAAAAAAAAAABAAAAAAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAQAAA&#xA;AAC0AAABQAAAAAAAJGVkdHMAAAAcZWxzdAAAAAAAAAABAAAI/AAAAAAAAQAAAAACM21kaWEAAAAg&#xA;bWRoZAAAAAAAAAAAAAAAAAABX5AAAyiYVcQAAAAAAC1oZGxyAAAAAAAAAAB2aWRlAAAAAAAAAAAA&#xA;AAAAVmlkZW9IYW5kbGVyAAAAAd5taW5mAAAAFHZtaGQAAAABAAAAAAAAAAAAAAAkZGluZgAAABxk&#xA;cmVmAAAAAAAAAAEAAAAMdXJsIAAAAAEAAAGec3RibAAAAG5zdHNkAAAAAAAAAAEAAABeYXZjMQAA&#xA;AAAAAAABAAAAAAAAAAAAAAAAAAAAAAC0AUAASAAAAEgAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAA&#xA;AAAAAAAAAAAAAAAAAAAAABj//wAAAAhhdmNDAAAAGHN0dHMAAAAAAAAAAQAAAC4AABGUAAAAFHN0&#xA;c3MAAAAAAAAAAQAAAAEAAAAcc3RzYwAAAAAAAAABAAAAAQAAAC4AAAABAAAAzHN0c3oAAAAAAAAA&#xA;AAAAAC4AAAMzAAAAFAAAABIAAAARAAAADgAAABcAAAARAAAADgAAAA4AAAAsAAAAHgAAABIAAAAS&#xA;AAAASwAAAB0AAAATAAAAEwAAACAAAAAPAAAAEwAAABMAAAAeAAAAHQAAABMAAAATAAAALQAAAA8A&#xA;AAATAAAAFAAAACcAAAAdAAAAFAAAABMAAAAfAAAADwAAABMAAAAUAAAAHwAAAB0AAAAUAAAAEwAA&#xA;AB8AAAAPAAAAEwAAABQAAAAuAAAAFHN0Y28AAAAAAAAAAQAAADAAAABidWR0YQAAAFptZXRhAAAA&#xA;AAAAACFoZGxyAAAAAAAAAABtZGlyYXBwbAAAAAAAAAAAAAAAAC1pbHN0AAAAJal0b28AAAAdZGF0&#xA;YQAAAAEAAAAATGF2ZjU4LjI5LjEwMA==&#xA;

    &#xA;

    And I try to play it in Media Player in Windows 11. It can not play at all and fails with a 0xC00D36C4 error.

    &#xA;

    Later I compiled and run the same code in Ubuntu 22.04. This time I got a 3161 byte file (base64 encoded) which can be correctly played in Media Player :

    &#xA;

    AAAAIGZ0eXBpc29tAAACAGlzb21pc28yYXZjMW1wNDEAAAAIZnJlZQAACF5tZGF0AAAAGWdkAAys&#xA;2UMCnn4QAAADABAAAAMAIPFCmWAAAAAGaOvjyyLAAAACrgYF//&#x2B;q3EXpvebZSLeWLNgg2SPu73gy&#xA;NjQgLSBjb3JlIDE2MyByMzA2MCA1ZGI2YWE2IC0gSC4yNjQvTVBFRy00IEFWQyBjb2RlYyAtIENv&#xA;cHlsZWZ0IDIwMDMtMjAyMSAtIGh0dHA6Ly93d3cudmlkZW9sYW4ub3JnL3gyNjQuaHRtbCAtIG9w&#xA;dGlvbnM6IGNhYmFjPTEgcmVmPTMgZGVibG9jaz0xOjA6MCBhbmFseXNlPTB4MzoweDExMyBtZT1o&#xA;ZXggc3VibWU9NyBwc3k9MSBwc3lfcmQ9MS4wMDowLjAwIG1peGVkX3JlZj0xIG1lX3JhbmdlPTE2&#xA;IGNocm9tYV9tZT0xIHRyZWxsaXM9MSA4eDhkY3Q9MSBjcW09MCBkZWFkem9uZT0yMSwxMSBmYXN0&#xA;X3Bza2lwPTEgY2hyb21hX3FwX29mZnNldD0tMiB0aHJlYWRzPTEwIGxvb2thaGVhZF90aHJlYWRz&#xA;PTEgc2xpY2VkX3RocmVhZHM9MCBucj0wIGRlY2ltYXRlPTEgaW50ZXJsYWNlZD0wIGJsdXJheV9j&#xA;b21wYXQ9MCBjb25zdHJhaW5lZF9pbnRyYT0wIGJmcmFtZXM9MyBiX3B5cmFtaWQ9MiBiX2FkYXB0&#xA;PTEgYl9iaWFzPTAgZGlyZWN0PTEgd2VpZ2h0Yj0xIG9wZW5fZ29wPTAgd2VpZ2h0cD0yIGtleWlu&#xA;dD0yNTAga2V5aW50X21pbj0xIHNjZW5lY3V0PTQwIGludHJhX3JlZnJlc2g9MCByY19sb29rYWhl&#xA;YWQ9NDAgcmM9Y3JmIG1idHJlZT0xIGNyZj0yMy4wIHFjb21wPTAuNjAgcXBtaW49MCBxcG1heD02&#xA;OSBxcHN0ZXA9NCBpcF9yYXRpbz0xLjQwIGFxPTE6MS4wMACAAAAAWmWIhAAV//7sz34FN2u2Mv14&#xA;OUV1GW52wf6mv09Y/&#x2B;Eq5ywBqFdjI7RiQruDqkHmD84Ah&#x2B;1pD&#x2B;u&#x2B;Ju9pbKoJmVnS6c&#x2B;DhXKzmU8A&#xA;AEJAA5Q0japbJSyuwAA24QAAAENBmiRsR/93Hj0GFYn&#x2B;ROeWur9cQ/zaceE37Gsw8XYMMBmtQahK&#xA;nnp6wFvNgAvbtn&#x2B;cxJ0Z91z2CA/nTap57PBeAAesAAAAC0GeQniN//WveLD/AAAACwGeYXRE//Lq&#xA;lyJeAAAACQGeY2pE/wAOWQAAAKRBmmhJqEFomUwIb/&#x2B;HBst5Vmv/hAk6mKwl1nhLEgC5JEPr5DCU&#xA;VnJmIORbRW23GIPDEuLFYpgAjTnwfchYIZFeHox/487bPMhsWqRfuupsl62bRlu2PFr1K57YcLnJ&#xA;b11Jv4VSXcVpsCeBYsxz7wYLcP8NN3T/QIszVyDj25ai291KJSbITxeer9CGz7TrMDp&#x2B;pqxqSvAl&#xA;U5fHF71S9I2H4oAccQAAAA1BnoZFESxv&#x2B;GoYwGVBAAAACQGepXRE/wAOWQAAAAsBnqdqRP/42vcB&#xA;ZQAAAEVBmqxJqEFsmUwIb//lIJwN4SH/2GHrfrkLLPBTCyfxRkCimcDT8zltZqnYDd2ZQPZxyWfN&#xA;ki4FupTgFvWOPfeoPoAAZ8AAAAAKQZ7KRRUsTwAOWQAAAAsBnul0S//ReV8XcAAAAAsBnutqS//W&#xA;sO0OmAAAACNBmvBJqEFsmUwIb//mvXwNPF1YZuydPMtlZpns/upv8AAM&#x2B;QAAACZBnw5FFSxP0Ikp&#xA;wuqTXmwEu&#x2B;OiB8CYQNYpaRkGb5/5RmPwl&#x2B;sYEQAAAAsBny10S//ReV8XcQAAAAkBny9qS/8AFJAA&#xA;AAAiQZs0SahBbJlMCGf/5Y/igCxy3DGPU&#x2B;M7b/99B91N&#x2B;gABxwAAAApBn1JFFSxPAA5ZAAAACwGf&#xA;cXRL/9F5XxdwAAAACwGfc2pL/9aw7Q6YAAAAJUGbeEmoQWyZTAhn/&#x2B;WP4oplmHh5dfVuNLjT8oT6&#xA;g/vUHsAAM&#x2B;EAAAAXQZ&#x2B;WRRUsT9JR1ZIMzs5XvDHwkvx&#x2B;sYEAAAAJAZ&#x2B;1dEv/ABSRAAAACwGft2pL&#xA;/9aw7Q6ZAAAAJkGbvEmoQWyZTAhn/&#x2B;WP4oxs8pNOGFNfSEOsZkgpGffuyAUAAOOAAAAAF0Gf2kUV&#xA;LE/SUWxSC3GeGyx8TNUf6xgRAAAACwGf&#x2B;XRL/9F5XxdwAAAACQGf&#x2B;2pL/wAUkQAAACZBm&#x2B;BJqEFs&#xA;mUwIX//goPeWk2SzeFEEGglcichS/FxJ/umLgABCwQAAAApBnh5FFSxPAA5YAAAACwGePXRL/9F5&#xA;XxdwAAAACwGeP2pL/9aw7Q6ZAAAAI0GaJEmoQWyZTAhf/&#x2B;Cg9mxhlMc0k8Yr1&#x2B;brXCEPvPx4AAz4&#xA;AAAAFkGeQkUVLE/SUWxSC3GeGyx5H0P1jAkAAAAJAZ5hdEv/ABSQAAAACwGeY2pL/9aw7Q6ZAAAA&#xA;JUGaaEmoQWyZTAhX/934FxaYaAYDmnHH4&#x2B;UwBaTcxW&#x2B;79/AAMWEAAAAWQZ6GRRUsT9JR1ZjbylIX&#xA;k3pEqIaFFQAAAAsBnqV0S//ReV8XcQAAAAkBnqdqS/8AFJAAAABHQZqsSahBbJlMCE//2hrhlW8w&#xA;qe7XMWJEx94kdXYQ9HRCQyVTdH4DhBK&#x2B;sOJ4AzLYtJsG08L95F&#x2B;uMqHODHeWVpY&#x2B;5tIAAQcAAAAV&#xA;QZ7KRRUsT9JRbFIKsqjUxE0DDQopAAAAIgGe6XRL/89KTt634hrgmPLOKW2Z10f5uKzr2C0EdNV3&#xA;4hYAAAALAZ7rakv/1rDtDpgAAAA0QZrwSahBbJlMCEf/2wXAE5vb0nGTGKtYx9JkEQt4dxtmo6f2&#xA;fWM6KXXZ/LgcMPb3AAAYsQAAA9Ntb292AAAAbG12aGQAAAAAAAAAAAAAAAAAAAPoAAAI/AABAAAB&#xA;AAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAA&#xA;AAAAAAAAAAAAAAAAAAAAAAACAAAC/XRyYWsAAABcdGtoZAAAAAMAAAAAAAAAAAAAAAEAAAAAAAAI&#xA;/AAAAAAAAAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAEAAAAAAtAAA&#xA;AUAAAAAAACRlZHRzAAAAHGVsc3QAAAAAAAAAAQAACPwAAAAAAAEAAAAAAnVtZGlhAAAAIG1kaGQA&#xA;AAAAAAAAAAAAAAAAAV&#x2B;QAAMomFXEAAAAAAAtaGRscgAAAAAAAAAAdmlkZQAAAAAAAAAAAAAAAFZp&#xA;ZGVvSGFuZGxlcgAAAAIgbWluZgAAABR2bWhkAAAAAQAAAAAAAAAAAAAAJGRpbmYAAAAcZHJlZgAA&#xA;AAAAAAABAAAADHVybCAAAAABAAAB4HN0YmwAAACwc3RzZAAAAAAAAAABAAAAoGF2YzEAAAAAAAAA&#xA;AQAAAAAAAAAAAAAAAAAAAAAAtAFAAEgAAABIAAAAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&#xA;AAAAAAAAAAAAAAAY//8AAAA2YXZjQwFkAAz/4QAZZ2QADKzZQwKefhAAAAMAEAAAAwAg8UKZYAEA&#xA;Bmjr48siwP34&#x2B;AAAAAAUYnRydAAAAAAAABz&#x2B;AAAc/gAAABhzdHRzAAAAAAAAAAEAAAAuAAARlAAA&#xA;ABRzdHNzAAAAAAAAAAEAAAABAAAAHHN0c2MAAAAAAAAAAQAAAAEAAAAuAAAAAQAAAMxzdHN6AAAA&#xA;AAAAAAAAAAAuAAADNwAAAEcAAAAPAAAADwAAAA0AAACoAAAAEQAAAA0AAAAPAAAASQAAAA4AAAAP&#xA;AAAADwAAACcAAAAqAAAADwAAAA0AAAAmAAAADgAAAA8AAAAPAAAAKQAAABsAAAANAAAADwAAACoA&#xA;AAAbAAAADwAAAA0AAAAqAAAADgAAAA8AAAAPAAAAJwAAABoAAAANAAAADwAAACkAAAAaAAAADwAA&#xA;AA0AAABLAAAAGQAAACYAAAAPAAAAOAAAABRzdGNvAAAAAAAAAAEAAAAwAAAAYnVkdGEAAABabWV0&#xA;YQAAAAAAAAAhaGRscgAAAAAAAAAAbWRpcmFwcGwAAAAAAAAAAAAAAAAtaWxzdAAAACWpdG9vAAAA&#xA;HWRhdGEAAAABAAAAAExhdmY1OC43Ni4xMDA=&#xA;

    &#xA;

  • Why is a file unplayable in Windows Media Player ?

    21 février 2024, par zhang

    I have written some code to generate a MP4 video. This is a simplified version of the code :

    &#xA;

    #include <iostream>&#xA;#include <fstream>&#xA;#include <cstdio>&#xA;#include <string>&#xA;#include <list>&#xA;#include &#xA;&#xA;extern "C"&#xA;{&#xA;#include "libavformat/avformat.h"&#xA;#include "libavutil/frame.h"&#xA;#include "libavcodec/avcodec.h"&#xA;#include "libavutil/imgutils.h"&#xA;}&#xA;using namespace std;&#xA;&#xA;const int output_width = 180;&#xA;const int output_height = 320;&#xA;&#xA;int main(int argc, char **argv)&#xA;{&#xA;    AVCodec *output_avc = avcodec_find_encoder_by_name("libx264");&#xA;    if (!output_avc)&#xA;        abort();&#xA;    AVCodecContext *output_cc = avcodec_alloc_context3(output_avc);&#xA;    if (!output_cc)&#xA;        abort();&#xA;&#xA;    output_cc->time_base.num = output_cc->time_base.den = 1;&#xA;    output_cc->pix_fmt = AV_PIX_FMT_YUV420P;&#xA;&#xA;    output_cc->width = output_width;&#xA;    output_cc->height = output_height;&#xA;&#xA;    if (avcodec_is_open(output_cc) == 0)&#xA;    {&#xA;        if (avcodec_open2(output_cc, output_avc, 0) &lt; 0)&#xA;            abort();&#xA;    }&#xA;&#xA;    string outf = "res.mp4";&#xA;    AVFormatContext *output_ctx;&#xA;    avformat_alloc_output_context2(&amp;output_ctx, NULL, NULL, outf.c_str());&#xA;    AVStream *out_stream = avformat_new_stream(output_ctx, 0);&#xA;    out_stream->codecpar->codec_id = AV_CODEC_ID_H264;&#xA;    out_stream->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;&#xA;    out_stream->codecpar->codec_tag = 0;&#xA;    out_stream->codecpar->width = output_width;&#xA;    out_stream->codecpar->height = output_height;&#xA;    out_stream->codecpar->format = AV_PIX_FMT_YUV420P;&#xA;    av_dump_format(output_ctx, 0, outf.c_str(), 1);&#xA;    if (!(output_ctx->oformat->flags &amp; AVFMT_NOFILE))&#xA;    {&#xA;        if (avio_open(&amp;output_ctx->pb, outf.c_str(), AVIO_FLAG_WRITE) &lt; 0)&#xA;            abort();&#xA;    }&#xA;    if (avformat_write_header(output_ctx, NULL) &lt; 0)&#xA;        abort();&#xA;&#xA;    AVPacket packet;&#xA;    AVFrame *frame;&#xA;    int fileCount = 0;&#xA;&#xA;    for (int i = 0; i &lt; 100; i&#x2B;&#x2B;)&#xA;    {&#xA;        frame = av_frame_alloc();&#xA;        frame->width = output_width;&#xA;        frame->height = output_height;&#xA;        frame->format = AV_PIX_FMT_YUV420P;&#xA;        if (av_image_alloc(frame->data, frame->linesize, frame->width, frame->height, AV_PIX_FMT_YUV420P, 32) &lt; 0)&#xA;            abort();&#xA;        frame->pts = 60000 * i;&#xA;        frame->pkt_dts = 60000 * i;&#xA;        if (avcodec_send_frame(output_cc, frame) &lt; 0)&#xA;            abort();&#xA;        av_frame_free(&amp;frame);&#xA;&#xA;        av_new_packet(&amp;packet, 0);&#xA;        while (avcodec_receive_packet(output_cc, &amp;packet) >= 0)&#xA;        {&#xA;            packet.pos = -1;&#xA;            packet.dts = 4500 * fileCount;&#xA;            packet.pts = 4500 * fileCount;&#xA;            packet.duration = 4500;&#xA;            av_write_frame(output_ctx, &amp;packet);&#xA;            av_packet_unref(&amp;packet);&#xA;            av_new_packet(&amp;packet, 0);&#xA;            fileCount&#x2B;&#x2B;;&#xA;        }&#xA;        av_packet_unref(&amp;packet);&#xA;    }&#xA;    avcodec_free_context(&amp;output_cc);&#xA;&#xA;    av_write_trailer(output_ctx);&#xA;    if (output_ctx &amp;&amp; !(output_ctx->oformat->flags &amp; AVFMT_NOFILE))&#xA;        avio_close(output_ctx->pb);&#xA;    avformat_free_context(output_ctx);&#xA;}&#xA;</list></string></cstdio></fstream></iostream>

    &#xA;

    Then, I compiled it (with g&#x2B;&#x2B; encode.cpp -lavcodec -lavformat -lavutil -g and libraries are installed via Ubuntu 20.04 apt) and run it. This is the MP4 file I get (2872 bytes, base64 encoded) :

    &#xA;

    AAAAIGZ0eXBpc29tAAACAGlzb21pc28yYXZjMW1wNDEAAAAIZnJlZQAAB39tZGF0AAAAAWdkAAys&#xA;2UMCnn4QAAADABAAAAMAIPFCmWAAAAABaOvjyyLAAAABBgX//6rcRem95tlIt5Ys2CDZI&#x2B;7veDI2&#xA;NCAtIGNvcmUgMTU1IHIyOTE3IDBhODRkOTggLSBILjI2NC9NUEVHLTQgQVZDIGNvZGVjIC0gQ29w&#xA;eWxlZnQgMjAwMy0yMDE4IC0gaHR0cDovL3d3dy52aWRlb2xhbi5vcmcveDI2NC5odG1sIC0gb3B0&#xA;aW9uczogY2FiYWM9MSByZWY9MyBkZWJsb2NrPTE6MDowIGFuYWx5c2U9MHgzOjB4MTEzIG1lPWhl&#xA;eCBzdWJtZT03IHBzeT0xIHBzeV9yZD0xLjAwOjAuMDAgbWl4ZWRfcmVmPTEgbWVfcmFuZ2U9MTYg&#xA;Y2hyb21hX21lPTEgdHJlbGxpcz0xIDh4OGRjdD0xIGNxbT0wIGRlYWR6b25lPTIxLDExIGZhc3Rf&#xA;cHNraXA9MSBjaHJvbWFfcXBfb2Zmc2V0PS0yIHRocmVhZHM9MTAgbG9va2FoZWFkX3RocmVhZHM9&#xA;MSBzbGljZWRfdGhyZWFkcz0wIG5yPTAgZGVjaW1hdGU9MSBpbnRlcmxhY2VkPTAgYmx1cmF5X2Nv&#xA;bXBhdD0wIGNvbnN0cmFpbmVkX2ludHJhPTAgYmZyYW1lcz0zIGJfcHlyYW1pZD0yIGJfYWRhcHQ9&#xA;MSBiX2JpYXM9MCBkaXJlY3Q9MSB3ZWlnaHRiPTEgb3Blbl9nb3A9MCB3ZWlnaHRwPTIga2V5aW50&#xA;PTI1MCBrZXlpbnRfbWluPTEgc2NlbmVjdXQ9NDAgaW50cmFfcmVmcmVzaD0wIHJjX2xvb2thaGVh&#xA;ZD00MCByYz1jcmYgbWJ0cmVlPTEgY3JmPTIzLjAgcWNvbXA9MC42MCBxcG1pbj0wIHFwbWF4PTY5&#xA;IHFwc3RlcD00IGlwX3JhdGlvPTEuNDAgYXE9MToxLjAwAIAAAAFliIQAF//&#x2B;7oK&#x2B;BTeKk2/DVSCr&#xA;MT4MeFdCVv4gBUyU0LeeB3T/sW2Y2XML/dzzR/1dfS/wWmJ&#x2B;KGm0PX/sHuGpnyAn2gs5wsYABhgA&#xA;WoTf&#x2B;9Y7PDk9QANDAAAAAUGaJGxBf/rtlHe1U64AATcAAAABQZ5CeILfbxYfLVgA1IEAAAABAZ5h&#xA;dEFfe7ECY2ABFwAAAAEBnmNqQV8AAAXdAAAAAUGaaEmoQWiZTAgv//7aplgACJkAAAABQZ6GRREs&#xA;Fv8AAAMDuwAAAAEBnqV0QV8AAAXdAAAAAQGep2pBXwAABdwAAAABQZqsSahBbJlMCCn/pl89fETi&#xA;z77HITCNid5IReE1K1v97aqMUAALuAAAAAFBnspFFSwj//KT/ryYOcNSN&#x2B;trDqIVVMoJuQAAAAEB&#xA;nul0QV/Y3j/sYkAS8AAAAAEBnutqQV/YnLf8lQQC4gAAAAFBmvBLqEIQWyFwE9QE8wCG/4899h7r&#xA;ur/hzq5kViiXU1N/7bVj0xCq2NuW3nBS6YfDQ992r2uqpbMofO1lE5tnQK9JUQ5YGQAAAAFBnw5F&#xA;FSxf9fg4AYHw/MtxZuh3cyjYZEvBAAAAAQGfLXRBX9j1VS/3qogFxQAAAAEBny9qQV/YoOAr/sYk&#xA;AS8AAAABQZs0S6hCEFsgjBdQXMAgp/&#x2B;h1f9/vbVRigABdwAAAAFBn1JFFSwj/wAFJQAAAAEBn3F0&#xA;QV/XxXD/9jEgCXgAAAABAZ9zakFf2CYBX/YxIAl4AAAAAUGbeEuoQhBbI8FVBUwCGf&#x2B;cVtZB6o&#x2B;w&#xA;AAd1AAAAAUGflkUVLF/5hTWAMD4fmW4s3Q7uZRsMiXgAAAABAZ&#x2B;1dEFf2PnD/9jEgCXhAAAAAQGf&#xA;t2pBX9ig4Cv&#x2B;xiQBLwAAAAFBm7xLqEIQWyHwTNBMUAgl/5uKXHNoSDz2kspLKh1/aGf97VTrgABL&#xA;wAAAAAFBn9pFFSwj/wAFJQAAAAEBn/l0QV/Y9mTr/eqiAXEAAAABAZ/7akFf2PyAa/9LVQC4gQAA&#xA;AAFBm&#x2B;BLqEIQWyGwGtQGswCF/40iq4lIKUsvpwcj71B5AACtgQAAAAFBnh5FFSxf&#x2B;YU3S0ZHIuL8&#xA;nYrTAtHfPEvAAAAAAQGePXRBX9guMnX&#x2B;9VEAuIAAAAABAZ4/akFf2KDgK/7GJAEvAAAAAUGaJEuo&#xA;QhBbIbCTQkUAgj&#x2B;ZGG6&#x2B;9qp1wAAl4AAAAAFBnkJFFSwj/wAFJQAAAAEBnmF0QV/Y9mTr/eqiAXEA&#xA;AAABAZ5jakFf2PyAa/9LVQC4gQAAAAFBmmhLqEIQWyFwN1A3MAhf/40jE99QeQAArYEAAAABQZ6G&#xA;RRUsX/X4OAGB8PzLcWbIzTkgw4Q&#x2B;YQAAAAEBnqV0QV/YLjJ1/vVRALiBAAAAAQGep2pBX9ig4Cv&#x2B;&#xA;xiQBLwAAAAFBmqxLqEIQWyGwk0JFAII/mRhuvvaqdcAAJeAAAAABQZ7KRRUsI/8ABSUAAAABAZ7p&#xA;dEFf2PZk6/3qogFxAAAAAQGe62pBX9j8gGv/S1UAuIAAAAABQZrwS6hCEFshcBTUBTMAhP&#x2B;CU2ym&#xA;36ypkZobj4/dQd9&#x2B;Isf9z8aAAKmBAAADkW1vb3YAAABsbXZoZAAAAAAAAAAAAAAAAAAAA&#x2B;gAAAj8&#xA;AAEAAAEAAAAAAAAAAAAAAAABAAAAAAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAQAAAAAAAAAAA&#xA;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAIAAAK7dHJhawAAAFx0a2hkAAAAAwAAAAAAAAAAAAAAAQAA&#xA;AAAAAAj8AAAAAAAAAAAAAAAAAAAAAAABAAAAAAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAQAAA&#xA;AAC0AAABQAAAAAAAJGVkdHMAAAAcZWxzdAAAAAAAAAABAAAI/AAAAAAAAQAAAAACM21kaWEAAAAg&#xA;bWRoZAAAAAAAAAAAAAAAAAABX5AAAyiYVcQAAAAAAC1oZGxyAAAAAAAAAAB2aWRlAAAAAAAAAAAA&#xA;AAAAVmlkZW9IYW5kbGVyAAAAAd5taW5mAAAAFHZtaGQAAAABAAAAAAAAAAAAAAAkZGluZgAAABxk&#xA;cmVmAAAAAAAAAAEAAAAMdXJsIAAAAAEAAAGec3RibAAAAG5zdHNkAAAAAAAAAAEAAABeYXZjMQAA&#xA;AAAAAAABAAAAAAAAAAAAAAAAAAAAAAC0AUAASAAAAEgAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAA&#xA;AAAAAAAAAAAAAAAAAAAAABj//wAAAAhhdmNDAAAAGHN0dHMAAAAAAAAAAQAAAC4AABGUAAAAFHN0&#xA;c3MAAAAAAAAAAQAAAAEAAAAcc3RzYwAAAAAAAAABAAAAAQAAAC4AAAABAAAAzHN0c3oAAAAAAAAA&#xA;AAAAAC4AAAMzAAAAFAAAABIAAAARAAAADgAAABcAAAARAAAADgAAAA4AAAAsAAAAHgAAABIAAAAS&#xA;AAAASwAAAB0AAAATAAAAEwAAACAAAAAPAAAAEwAAABMAAAAeAAAAHQAAABMAAAATAAAALQAAAA8A&#xA;AAATAAAAFAAAACcAAAAdAAAAFAAAABMAAAAfAAAADwAAABMAAAAUAAAAHwAAAB0AAAAUAAAAEwAA&#xA;AB8AAAAPAAAAEwAAABQAAAAuAAAAFHN0Y28AAAAAAAAAAQAAADAAAABidWR0YQAAAFptZXRhAAAA&#xA;AAAAACFoZGxyAAAAAAAAAABtZGlyYXBwbAAAAAAAAAAAAAAAAC1pbHN0AAAAJal0b28AAAAdZGF0&#xA;YQAAAAEAAAAATGF2ZjU4LjI5LjEwMA==&#xA;

    &#xA;

    And I try to play it in Media Player in Windows 11. It can not play at all and fails with a 0xC00D36C4 error.

    &#xA;

    Later I compiled and run the same code in Ubuntu 22.04. This time I got a 3161 byte file (base64 encoded) which can be correctly played in Media Player :

    &#xA;

    AAAAIGZ0eXBpc29tAAACAGlzb21pc28yYXZjMW1wNDEAAAAIZnJlZQAACF5tZGF0AAAAGWdkAAys&#xA;2UMCnn4QAAADABAAAAMAIPFCmWAAAAAGaOvjyyLAAAACrgYF//&#x2B;q3EXpvebZSLeWLNgg2SPu73gy&#xA;NjQgLSBjb3JlIDE2MyByMzA2MCA1ZGI2YWE2IC0gSC4yNjQvTVBFRy00IEFWQyBjb2RlYyAtIENv&#xA;cHlsZWZ0IDIwMDMtMjAyMSAtIGh0dHA6Ly93d3cudmlkZW9sYW4ub3JnL3gyNjQuaHRtbCAtIG9w&#xA;dGlvbnM6IGNhYmFjPTEgcmVmPTMgZGVibG9jaz0xOjA6MCBhbmFseXNlPTB4MzoweDExMyBtZT1o&#xA;ZXggc3VibWU9NyBwc3k9MSBwc3lfcmQ9MS4wMDowLjAwIG1peGVkX3JlZj0xIG1lX3JhbmdlPTE2&#xA;IGNocm9tYV9tZT0xIHRyZWxsaXM9MSA4eDhkY3Q9MSBjcW09MCBkZWFkem9uZT0yMSwxMSBmYXN0&#xA;X3Bza2lwPTEgY2hyb21hX3FwX29mZnNldD0tMiB0aHJlYWRzPTEwIGxvb2thaGVhZF90aHJlYWRz&#xA;PTEgc2xpY2VkX3RocmVhZHM9MCBucj0wIGRlY2ltYXRlPTEgaW50ZXJsYWNlZD0wIGJsdXJheV9j&#xA;b21wYXQ9MCBjb25zdHJhaW5lZF9pbnRyYT0wIGJmcmFtZXM9MyBiX3B5cmFtaWQ9MiBiX2FkYXB0&#xA;PTEgYl9iaWFzPTAgZGlyZWN0PTEgd2VpZ2h0Yj0xIG9wZW5fZ29wPTAgd2VpZ2h0cD0yIGtleWlu&#xA;dD0yNTAga2V5aW50X21pbj0xIHNjZW5lY3V0PTQwIGludHJhX3JlZnJlc2g9MCByY19sb29rYWhl&#xA;YWQ9NDAgcmM9Y3JmIG1idHJlZT0xIGNyZj0yMy4wIHFjb21wPTAuNjAgcXBtaW49MCBxcG1heD02&#xA;OSBxcHN0ZXA9NCBpcF9yYXRpbz0xLjQwIGFxPTE6MS4wMACAAAAAWmWIhAAV//7sz34FN2u2Mv14&#xA;OUV1GW52wf6mv09Y/&#x2B;Eq5ywBqFdjI7RiQruDqkHmD84Ah&#x2B;1pD&#x2B;u&#x2B;Ju9pbKoJmVnS6c&#x2B;DhXKzmU8A&#xA;AEJAA5Q0japbJSyuwAA24QAAAENBmiRsR/93Hj0GFYn&#x2B;ROeWur9cQ/zaceE37Gsw8XYMMBmtQahK&#xA;nnp6wFvNgAvbtn&#x2B;cxJ0Z91z2CA/nTap57PBeAAesAAAAC0GeQniN//WveLD/AAAACwGeYXRE//Lq&#xA;lyJeAAAACQGeY2pE/wAOWQAAAKRBmmhJqEFomUwIb/&#x2B;HBst5Vmv/hAk6mKwl1nhLEgC5JEPr5DCU&#xA;VnJmIORbRW23GIPDEuLFYpgAjTnwfchYIZFeHox/487bPMhsWqRfuupsl62bRlu2PFr1K57YcLnJ&#xA;b11Jv4VSXcVpsCeBYsxz7wYLcP8NN3T/QIszVyDj25ai291KJSbITxeer9CGz7TrMDp&#x2B;pqxqSvAl&#xA;U5fHF71S9I2H4oAccQAAAA1BnoZFESxv&#x2B;GoYwGVBAAAACQGepXRE/wAOWQAAAAsBnqdqRP/42vcB&#xA;ZQAAAEVBmqxJqEFsmUwIb//lIJwN4SH/2GHrfrkLLPBTCyfxRkCimcDT8zltZqnYDd2ZQPZxyWfN&#xA;ki4FupTgFvWOPfeoPoAAZ8AAAAAKQZ7KRRUsTwAOWQAAAAsBnul0S//ReV8XcAAAAAsBnutqS//W&#xA;sO0OmAAAACNBmvBJqEFsmUwIb//mvXwNPF1YZuydPMtlZpns/upv8AAM&#x2B;QAAACZBnw5FFSxP0Ikp&#xA;wuqTXmwEu&#x2B;OiB8CYQNYpaRkGb5/5RmPwl&#x2B;sYEQAAAAsBny10S//ReV8XcQAAAAkBny9qS/8AFJAA&#xA;AAAiQZs0SahBbJlMCGf/5Y/igCxy3DGPU&#x2B;M7b/99B91N&#x2B;gABxwAAAApBn1JFFSxPAA5ZAAAACwGf&#xA;cXRL/9F5XxdwAAAACwGfc2pL/9aw7Q6YAAAAJUGbeEmoQWyZTAhn/&#x2B;WP4oplmHh5dfVuNLjT8oT6&#xA;g/vUHsAAM&#x2B;EAAAAXQZ&#x2B;WRRUsT9JR1ZIMzs5XvDHwkvx&#x2B;sYEAAAAJAZ&#x2B;1dEv/ABSRAAAACwGft2pL&#xA;/9aw7Q6ZAAAAJkGbvEmoQWyZTAhn/&#x2B;WP4oxs8pNOGFNfSEOsZkgpGffuyAUAAOOAAAAAF0Gf2kUV&#xA;LE/SUWxSC3GeGyx8TNUf6xgRAAAACwGf&#x2B;XRL/9F5XxdwAAAACQGf&#x2B;2pL/wAUkQAAACZBm&#x2B;BJqEFs&#xA;mUwIX//goPeWk2SzeFEEGglcichS/FxJ/umLgABCwQAAAApBnh5FFSxPAA5YAAAACwGePXRL/9F5&#xA;XxdwAAAACwGeP2pL/9aw7Q6ZAAAAI0GaJEmoQWyZTAhf/&#x2B;Cg9mxhlMc0k8Yr1&#x2B;brXCEPvPx4AAz4&#xA;AAAAFkGeQkUVLE/SUWxSC3GeGyx5H0P1jAkAAAAJAZ5hdEv/ABSQAAAACwGeY2pL/9aw7Q6ZAAAA&#xA;JUGaaEmoQWyZTAhX/934FxaYaAYDmnHH4&#x2B;UwBaTcxW&#x2B;79/AAMWEAAAAWQZ6GRRUsT9JR1ZjbylIX&#xA;k3pEqIaFFQAAAAsBnqV0S//ReV8XcQAAAAkBnqdqS/8AFJAAAABHQZqsSahBbJlMCE//2hrhlW8w&#xA;qe7XMWJEx94kdXYQ9HRCQyVTdH4DhBK&#x2B;sOJ4AzLYtJsG08L95F&#x2B;uMqHODHeWVpY&#x2B;5tIAAQcAAAAV&#xA;QZ7KRRUsT9JRbFIKsqjUxE0DDQopAAAAIgGe6XRL/89KTt634hrgmPLOKW2Z10f5uKzr2C0EdNV3&#xA;4hYAAAALAZ7rakv/1rDtDpgAAAA0QZrwSahBbJlMCEf/2wXAE5vb0nGTGKtYx9JkEQt4dxtmo6f2&#xA;fWM6KXXZ/LgcMPb3AAAYsQAAA9Ntb292AAAAbG12aGQAAAAAAAAAAAAAAAAAAAPoAAAI/AABAAAB&#xA;AAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAA&#xA;AAAAAAAAAAAAAAAAAAAAAAACAAAC/XRyYWsAAABcdGtoZAAAAAMAAAAAAAAAAAAAAAEAAAAAAAAI&#xA;/AAAAAAAAAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAEAAAAAAtAAA&#xA;AUAAAAAAACRlZHRzAAAAHGVsc3QAAAAAAAAAAQAACPwAAAAAAAEAAAAAAnVtZGlhAAAAIG1kaGQA&#xA;AAAAAAAAAAAAAAAAAV&#x2B;QAAMomFXEAAAAAAAtaGRscgAAAAAAAAAAdmlkZQAAAAAAAAAAAAAAAFZp&#xA;ZGVvSGFuZGxlcgAAAAIgbWluZgAAABR2bWhkAAAAAQAAAAAAAAAAAAAAJGRpbmYAAAAcZHJlZgAA&#xA;AAAAAAABAAAADHVybCAAAAABAAAB4HN0YmwAAACwc3RzZAAAAAAAAAABAAAAoGF2YzEAAAAAAAAA&#xA;AQAAAAAAAAAAAAAAAAAAAAAAtAFAAEgAAABIAAAAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&#xA;AAAAAAAAAAAAAAAY//8AAAA2YXZjQwFkAAz/4QAZZ2QADKzZQwKefhAAAAMAEAAAAwAg8UKZYAEA&#xA;Bmjr48siwP34&#x2B;AAAAAAUYnRydAAAAAAAABz&#x2B;AAAc/gAAABhzdHRzAAAAAAAAAAEAAAAuAAARlAAA&#xA;ABRzdHNzAAAAAAAAAAEAAAABAAAAHHN0c2MAAAAAAAAAAQAAAAEAAAAuAAAAAQAAAMxzdHN6AAAA&#xA;AAAAAAAAAAAuAAADNwAAAEcAAAAPAAAADwAAAA0AAACoAAAAEQAAAA0AAAAPAAAASQAAAA4AAAAP&#xA;AAAADwAAACcAAAAqAAAADwAAAA0AAAAmAAAADgAAAA8AAAAPAAAAKQAAABsAAAANAAAADwAAACoA&#xA;AAAbAAAADwAAAA0AAAAqAAAADgAAAA8AAAAPAAAAJwAAABoAAAANAAAADwAAACkAAAAaAAAADwAA&#xA;AA0AAABLAAAAGQAAACYAAAAPAAAAOAAAABRzdGNvAAAAAAAAAAEAAAAwAAAAYnVkdGEAAABabWV0&#xA;YQAAAAAAAAAhaGRscgAAAAAAAAAAbWRpcmFwcGwAAAAAAAAAAAAAAAAtaWxzdAAAACWpdG9vAAAA&#xA;HWRhdGEAAAABAAAAAExhdmY1OC43Ni4xMDA=&#xA;

    &#xA;

  • Prepare mp4 videos for Media Source Extensions API using ffmpeg

    6 février 2018, par ler

    This command produce init.mp4 + bunch of m4s files, i’m trying to play them using MSE :

    ffmpeg -i <input file="file" /> -f hls -hls_segment_type fmp4 -c:v copy playlist.m3u8

    This is the client side code i’m using :

    var socket = io();
    
var video = document.querySelector('video');
    
var mimeCodec = 'video/mp4; codecs="avc1.64000d,mp4a.40.2"'; 
    
if ('MediaSource' in window &amp;&amp; MediaSource.isTypeSupported(mimeCodec)) {
    
    var mediaSource = new MediaSource;
    
    video.src = URL.createObjectURL(mediaSource);
    
    mediaSource.addEventListener('sourceopen', sourceOpen);
    
} else {
    
    console.error('Unsupported MIME type or codec: ', mimeCodec);
    
}
    
function sourceOpen (_) {
    
  var mediaSource = this;
    
  var sourceBuffer = mediaSource.addSourceBuffer(mimeCodec);
    
  sourceBuffer.mode = 'sequence'; 
    
  socket.on('broadcast', function (newPiece) {
    
      // here i'm getting the buffer of the video  == buffer
    
      sourceBuffer.addEventListener('updateend', function (_) {
    
        video.play().then(function() { }).catch(function(error) { });
    
      });
    
      sourceBuffer.appendBuffer(buffer); // when the seconde video comes i append it's buffer
    
  })
    
};

    Everything works fine when i send init.mp4 file followed by playlist0.m4s, playlist1.m4s, playlist2.m4s, .....
    But when i try to play init.mp4 file followed immediately 6,7,8 not 0,1,2 meaning playlist6.m4s, playlist7.m4s, playlist8.m4s, ...., it didn’t work.
    I don’t know why, this supposed to be live video, the viewer that is watching the live from the beginning gets init.mp4, playlist0.m4s, playlist1.m4s, playlist2.m4s, .....
    Someone that came after 5 minutes gets something like this init.mp4, playlist32.m4s, playlist33.m4s, playlist34.m4s, .... and so on, but so far it works only for the viewer that get’s init.mp4, playlist0.m4s, playlist1.m4s, playlist2.m4s, ..... the video can’t play for the others

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