Concatenating videos troubles - ffmpeg

[dmennenoh]

I am recording video from a web cam using Adobe Media Server. Recording to .flv at 640x360

I have another set of already recorded .flv files - also at 640x360, and output from Premiere.

I am trying to use FFMPEG to concat them into one video using a file list text file.

When I run the ffmpeg command I get many errors about missing headers, 0x0 frame size, etc. on the second (AMS recorded) flv.

The resulting video plays the pre-recorded one and then gets totally distorted when playing the AMS one.

I have tried using the -re (reEncode) option of FFMPEG, also with no luck.

I do realize that the pre-recorded ones use ON2VP6 and the AMS ones use I think Sorenson Spark, but have also tried converting the flv to mp4 and then using a pre-recorded mp4 to concat and still garbage.

So - what I need is - does anyone know how I can stitch/concatenate videos together on the fly - some from Premiere, some from AMS? It seems like it should be so easy.

[dmennenoh]

FYI - got it working using the concat filter as opposed to the concat demuxer. Well, mostly working - everything plays and sounds and looks good - just at the start of the videos from AMS there is a 2-3 second pause and then it plays fine.