A .TREC file is a proprietary video recording format used exclusively by TinyMOS cameras, specifically the Tiny1 and TinyMOS NANO cameras. These cameras are designed for astro-photography and low-light video recording.
ffmpeg -i input.trec -c copy output.mp4 If that fails, try forcing demuxer: .trec video
ffmpeg -f h264 -i input.trec -c copy output.mp4 Some older .TREC files are actually renamed .mov or .mp4 . Try: .trec video
ffmpeg -f h264 -framerate 30 -i input.trec -c:v libx264 -pix_fmt yuv420p output.mp4 If it's Motion JPEG: .trec video