Some video formats hold some important information in memory until the recording is complete.
This means in the event of a power outage or system failure these recordings may be corrupt and difficult to recover.
TIP: Use the "New File Every" option to create new recordings at regular intervals so if one file is lost in event of a power outage, the majority of the recording can be recovered.
The following table describes the fault tolerance of each recording format supported by vMix:
Type  | 
File Format  | 
Fault Tolerant?  | 
vMix AVI  | 
AVI  | 
Yes  | 
AVI  | 
AVI  | 
No  | 
AVI  | 
MKV  | 
Yes  | 
MPEG-2  | 
MPG  | 
Yes  | 
MPEG-2  | 
TS  | 
Yes  | 
MP4  | 
MP4  | 
No  | 
MP4  | 
MP4   | 
Yes  | 
WMV  | 
WMV  | 
Yes  | 
FFMPEG  | 
MXF  | 
Yes  | 
FFMPEG  | 
MOV  | 
Yes  | 
FFMPEG  | 
MP4  | 
Yes  | 
FFMPEG  | 
MOV (Indexed)  | 
No  | 
FFMPEG  | 
MP4 (Indexed)  | 
No  | 
vMix AVI is the best fault tolerant format out of the above.