VideoEncodingTips

MTS to webm

Used ffmpeg to concatenate the files without reencoding (codec copy):

ffmpeg -f concat -i files -c copy whole.mts

where files contains:

file 00001.MTS
file 00002.MTS

etc.

Used gstreamer to convert to webm. This was after failed (i.e. success but garbage output - small random squares) attempts with both mencoder and ffmpeg:

gst-launch-0.10 filesrc location=whole.mts ! decodebin name=demux ! queue ! ffmpegcolorspace ! vp8enc ! webmmux name=mux ! filesink location=whole.webm demux. ! queue ! progressreport ! audioconvert ! audioresample ! vorbisenc ! mux.

Then used ffmpeg to cut without copy, this is almost instantaneous on a SSD drive (whole.webm is 914M):

ffmpeg -i whole.webm -ss 00:12:55 -to 20:07 -codec copy 03_EWB_Oren.webm

cropping with ffmpeg

ffmpeg -i atlassian_jira_workflow_graph_view_guides_demonstration_20150305_orig.webm -vf "crop=1920:1200:0:0" test.webm