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• FFMPEG- how to set presentation timestamp of a second video while merging a second video side-by-side with a first video

  14 octobre 2020, par Sankalpa Sarkar

  I was trying to merge a second video into a first video, side-by-side in a stacked fashion as a self-interest work. The twist is the video is a recording of a video call, where a second user might join at a later stage than the first user. The cumulative recording of the video call must reflect that the second user joins at a later stage than the first user. For this, I am using this code :

  


  DIFF=$(($start_ts-$BASEts))
DIFFms=`echo "scale=0;$DIFF/1000" | bc`
DIFFs=`echo "scale=4;$DIFF/1000000" | bc`
ffmpeg -i $a.webm -i b.webm -filter_complex \
    "[0]pad=2*iw:1*ih[l];[1]setpts=PTS-STARTPTS+$DIFFs/TB[1v]; [l][1v]overlay=x=W/2[v]; \
    [1]adelay=$DIFFms|$DIFFms[1a]; \
    [0][1a]amix=inputs=2[a]" \
    -map "[v]" -map "[a]" -vcodec libvpx -cpu-used -5 -deadline realtime finalOutput.webm


  


  However, the error being thrown here is :

  


  [Parsed_setpts_1 @ 0x55ada9df1dc0] [Eval @ 0x7ffff35acb60] Undefined constant or missing '(' in '/TB'
[Parsed_setpts_1 @ 0x55ada9df1dc0] Error while parsing expression 'PTS-STARTPTS+/TB'
[AVFilterGraph @ 0x55ada9d6c2a0] Error initializing filter 'setpts' with args 'PTS-STARTPTS+/TB'
Error initializing complex filters.
Invalid argument


  


  It is unable to read the $DIFFs variable at all, is what I figured. Can anybody help me out here ?

  


• Can not use the jsmpeg in react "Unexpected use of 'self'"

  5 mai 2020, par Muhammad Anas Khan

  code that i want to convert in React

  



   &#xA;    &#xA;    <code class="echappe-js">&lt;script type=&quot;text/javascript&quot; src='http://stackoverflow.com/feeds/tag/jsmpeg.min.js'&gt;&lt;/script&gt;&#xA;&#xA;    &lt;script type=&quot;text/javascript&quot;&gt;&amp;#xA;      var canvas = document.getElementById(&quot;videoCanvas&quot;);&amp;#xA;      console.log(document.location.hostname);&amp;#xA;     var url = &quot;ws://localhost:9999/&quot;;&amp;#xA;    &lt;/script&gt;&#xA;    &#xA;&#xA;

  



  Can not change it to react format.When i try to convert it is giving jsmpeg error 
i.e

  



  code that i tried but get an error

  



  import React from &#x27;react&#x27;;&#xA;import ReactDOM from &#x27;react-dom&#x27;;&#xA;import "./jsmpeg.min.js"&#xA;const App =()=>{&#xA;    return(&#xA;        <h1>Hello</h1>&#xA;    )&#xA;}&#xA;&#xA;&#xA;ReactDOM.render(<app></app>,document.getElementById(&#x27;root&#x27;));&#xA;

  



  Error

  



  /src/jsmpeg.min.js
Line 606:9 : Unexpected use of 'self' no-restricted-globals
 Line 2771:13 : Expected an assignment or function call and instead saw an expression no-unused-expressions

  



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• vulkan : Fix win/i386 calling convention

  5 mars 2023, par Martin Storsjö

  vulkan : Fix win/i386 calling convention
  This fixes the following error when compiling with a modern
  
  version of Clang for Windows/i386 :
  src/libavutil/hwcontext_vulkan.c:738:32 : error : incompatible function pointer types initializing 'PFN_vkDebugUtilsMessengerCallbackEXT' (aka 'unsigned int (*)(enum VkDebugUtilsMessageSeverityFlagBitsEXT, unsigned int, const struct VkDebugUtilsMessengerCallbackDataEXT *, void *) __attribute__((stdcall))') with an expression of type 'VkBool32 (VkDebugUtilsMessageSeverityFlagBitsEXT, VkDebugUtilsMessageTypeFlagsEXT, const VkDebugUtilsMessengerCallbackDataEXT *, void *)' (aka 'unsigned int (enum VkDebugUtilsMessageSeverityFlagBitsEXT, unsigned int, const struct VkDebugUtilsMessengerCallbackDataEXT *, void *)') [-Wincompatible-function-pointer-types]
  
              .pfnUserCallback = vk_dbg_callback,
  
                                 ^ 
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavutil/hwcontext_vulkan.c