I was editing a video for my friend when I got this odd message in rendering. Can someone tell me what it means? Thanks in advance.
Rendering of C:/Users/Matthew/Desktop/Doodle Derby 2 Final.webm crashed

[mp3 @ 0000000002c69b40] Estimating duration from bitrate, this may be inaccurate [mp3 @ 0000000005fc5700] Estimating duration from bitrate, this may be inaccurate [mp3 @ 0000000006282980] Estimating duration from bitrate, this may be inaccurate [mp3 @ 0000000006116dc0] Estimating duration from bitrate, this may be inaccurate [mp3 @ 0000000002c6e940] Estimating duration from bitrate, this may be inaccurate [mp3 @ 000000000cf8b4c0] Estimating duration from bitrate, this may be inaccurate [mp3 @ 0000000006111f40] Estimating duration from bitrate, this may be inaccurate [mp3 @ 0000000006186340] Estimating duration from bitrate, this may be inaccurate [mp3 @ 0000000006186340] Estimating duration from bitrate, this may be inaccurate [mp3 @ 000000000cbf9d80] Estimating duration from bitrate, this may be inaccurate [mp3 @ 000000000cab1840] Estimating duration from bitrate, this may be inaccurate [mp3 @ 000000000cbfa1c0] Estimating duration from bitrate, this may be inaccurate [mp3 @ 0000000021bf9280] Estimating duration from bitrate, this may be inaccurate [mp3 @ 0000000002ba4100] Estimating duration from bitrate, this may be inaccurate [mp3 @ 0000000021802980] Estimating duration from bitrate, this may be inaccurate [mp3 @ 000000000cbfb180] Estimating duration from bitrate, this may be inaccurate [mp3 @ 0000000002ba4100] Estimating duration from bitrate, this may be inaccurate [mp3 @ 000000002b7cf940] Estimating duration from bitrate, this may be inaccurate [mp3 @ 0000000016846940] Estimating duration from bitrate, this may be inaccurate [mp3 @ 00000000219be8c0] Estimating duration from bitrate, this may be inaccurate [mp3 @ 0000000021802980] Estimating duration from bitrate, this may be inaccurate [mp3 @ 00000000219becc0] Estimating duration from bitrate, this may be inaccurate [mp3 @ 0000000002ba4100] Estimating duration from bitrate, this may be inaccurate [mp3 @ 0000000006185f40] Estimating duration from bitrate, this may be inaccurate [mp3 @ 0000000015e87040] Estimating duration from bitrate, this may be inaccurate [mp3 @ 000000002b7cf940] Estimating duration from bitrate, this may be inaccurate [mp3 @ 000000002b7cf940] Estimating duration from bitrate, this may be inaccurate [mp3 @ 0000000022322940] Estimating duration from bitrate, this may be inaccurate [mp3 @ 000000002c19e640] Estimating duration from bitrate, this may be inaccurate [mp3 @ 000000004163c980] Estimating duration from bitrate, this may be inaccurate [mp3 @ 000000002c19e640] Estimating duration from bitrate, this may be inaccurate [mp3 @ 0000000022322040] Estimating duration from bitrate, this may be inaccurate [mp3 @ 0000000040c41280] Estimating duration from bitrate, this may be inaccurate [mp3 @ 00000000223224c0] Estimating duration from bitrate, this may be inaccurate [mp3 @ 000000002bdb0040] Estimating duration from bitrate, this may be inaccurate [mp3 @ 0000000022322040] Estimating duration from bitrate, this may be inaccurate
[webm @ 0000000000e72400] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead. [webm @ 0000000000e72400] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead. Current Frame: 25, percentage: 0
Assertion fctx->async_lock failed at C:/Craft/BC/windows-mingw_64-gcc/build/libs/ffmpeg/work/ffmpeg-4.2/libavcodec/pthread_frame.c:155