With Converter App, you can convert 3GPP files into many other formats:
3GPP to MP4 | 3GPP to MP3 | 3GPP to MOV | 3GPP to WEBM | 3GPP to MKV | 3GPP to AVI | 3GPP to WAV | 3GPP to M4A
→ All 3GPP Converters
If you want to keep working with your final FLV, try:
FLV to MP4 | FLV to MP3 | FLV to MOV | FLV to WEBM | FLV to WAV | FLV to M4A | FLV to AVI | FLV to TEXT
→ All FLV Converters