One cool thing about MPEG Stream Clip is that it can actually fix a bad video timeline which has broken time code and would otherwise drop all video after the time code break but Streamclip will rebuild all time code breaks so those programs that error out on some videos Streamclip can fix it. Oh yes I have also used MPEG StreamClip as it can remux and works on Mac but I don't think it is as compatible or fast like Handbrake or Brorsoft. It can handle a long list of formats like FLV, MP4, MOV, MKV, MTS, M2TS, ASF, WMV, AVI, and more, including converting MP4 to FLV and vice versa. Free FLV Converter is the easy-to-use video converting software. What you will need is the MP4 to FLV converter. I can't say enough about Handbrake because it makes the best compatible and quality transcodes and does a great job on batch processing but is no where near as fast as remuxing. To convert MP4 to FLV, no special tech knowledge is required. Find the FLV videos you intend to convert, select and open them. Then click the Add File(s) menu at top of the window to trigger the open-file dialog. Launch the best free FLV to MP4 converter after you installed it on your PC.

I prefer Handbrake if you actually have to transcode and still want quality but Brorsoft is quick and processes 4 at a time. Step 1: Install Free FLV to MP4 Converter. It just takes everything from any nested folders and remuxes them into one folder. In this case, you need a Handbrake alternative like MacX Video Converter Pro to convert MP4 to AVI format to resolve the Handbrake MP4 to AVI errors. I haven't figured out how to do multiple folders and have it recreate the separate multiple folders on the output though. (Here is an edit it in remembrance) I used to use 'Remux' on the Mac and I see that it is still out there albeit it is a newer version. I can't remember which one I use on Mac but if I remember I will come back and edit it in. I don't think they have it for Mac though. Brorsoft Video Converter, yes I know, I had to spend about $30 but it really does a great job Remuxing and batch processing.

Handbrake flv to mp4