Attempting to Merge Multiple FLV Videos

[Evan102]

https://wiki.videolan.org/How_to_Merge_ ... le_Videos/
I have 4 flv files I'm trying to merge. This is their Codec Media Information:

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Stream 0 Type: Video Codec: H264 - MPEG-4 AVC (part 10) (avc1) Resolution: 1280x720 Frame rate: 29.969996 Stream 1 Type: Audio Codec: MPEG AAC Audio (mp4a) Sample Rate: 48000 Hz Bits per sample: 16

I've tried using this command

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vlc 1.flv 2.flv 3.flv 4.flv --sout "#gather:std{access=file,mux=avi,dst=all.avi}" --sout-keep

It outputs a video missing audio.

I've tried converting each video before joining them but I've found converting them to mp4 makes the audio sound crappy. Is there a better format I could convert them to before joining them?