vp8

As your input file report a strange frame rate value 1k fps coming from the tbs and tbr value (look here for their definition) the encoder generate a different result, 16k tbn, 1k tbc (default) So by calling : ffmpeg -fflags +genpts -i 1.webm -r 24 1.mp4 You configure ffmpeg to generate new pts (a.k.a … Read more