follow this steps: https://userbase.kde.org/Kdenlive/Manual/Windows_Issues#Kdenlive_crash_or_green_Monitor

If Kdenlive still crashes, please check if you get a crash log: hit Windows-key+r -> eventvwr -> in the Event Viewer -> check the log inside Critical and Error. Post the error which Kdenlive is involved.

Nome do Log:   Application
Fonte:         Application Error
Data:          14/01/2019 13:43:19
Identificação do Evento:1000
Categoria da Tarefa:(100)
Nível:         Erro
Palavras-chave:Clássico
Usuário:       N/D
Computador:    PEDROKA
Descrição:
Nome de aplicativo com falha: kdenlive.exe, versão: 0.0.0.0, carimbo de hora: 0x00000000
Nome do módulo de falhas: kdenlive.exe, versão: 0.0.0.0, carimbo de hora: 0x00000000
Código de exceção: 0xc000041d
Deslocamento com falha: 0x000000000025c140
Identificação do processo com falha: 0x11a0
Hora de início do aplicativo com falha: 0x01d4ac1e76038d42
Caminho do aplicativo com falha: C:\Program Files\kdenlive\bin\kdenlive.exe
FCaminho do módulo de falhas: C:\Program Files\kdenlive\bin\kdenlive.exe
Identificação do Relatório: 1d7f4b32-1813-11e9-8665-7054d28af562
XML de Evento:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Application Error" />
    <EventID Qualifiers="0">1000</EventID>
    <Level>2</Level>
    <Task>100</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2019-01-14T15:43:19.000000000Z" />
    <EventRecordID>14809</EventRecordID>
    <Channel>Application</Channel>
    <Computer>PEDROKA</Computer>
    <Security />
  </System>
  <EventData>
    <Data>kdenlive.exe</Data>
    <Data>0.0.0.0</Data>
    <Data>00000000</Data>
    <Data>kdenlive.exe</Data>
    <Data>0.0.0.0</Data>
    <Data>00000000</Data>
    <Data>c000041d</Data>
    <Data>000000000025c140</Data>
    <Data>11a0</Data>
    <Data>01d4ac1e76038d42</Data>
    <Data>C:\Program Files\kdenlive\bin\kdenlive.exe</Data>
    <Data>C:\Program Files\kdenlive\bin\kdenlive.exe</Data>
    <Data>1d7f4b32-1813-11e9-8665-7054d28af562</Data>
  </EventData>
</Event>

The ExceptionCode 0xc000041d may occur due to “due to early thread created by app“. 

Make sure you set processing thread in Kdenlive to 1: CTRL+SHIFT+, (comma) -> environment -> Processing thread -> set to 1. 

Right click and start Kdenlive as administrator.

Please test whether this is still happening with a current version (https://kdenlive.org/en/download/) and the tips above.

Afterwards please update this bug.

Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!

This bug has been in NEEDSINFO status with no change for at least
30 days. The bug is now closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

Thank you for helping us make KDE software even better for everyone!