3/1/2023 0 Comments Ffmpeg mp4 faststartError setting option movflags to value frag_keyframe+empty_moov. Unable to parse option value "frag_keyframe+empty_moov" System running ubuntu 12.04圆4 with avconv version 0.8.1-4:0.8.1-0ubuntu1.Ĭommand: avconv -i 1081_20111227200000.mpg -f mp4 -movflags frag_keyframe+empty_moov -c:v libx264 -c:a copy output.mp4Įrror: Undefined constant or missing '(' in 'frag_keyframe' I have exhausted google and myself searching for answers and have come up blank so any help would be greatly appreciated. Below is my command, and the error output it generates. I believe I have followed the avconv instructions ( ) on how to convert a file, but continue to get errors that indicate the encoder does not understand the parameters. I read on avconv docs that "The mov/mp4/ismv muxer supports fragmentation." which can put a "fake" mov atom at the start of the file and then puts a new one at each keyframe throughout the file so the video can be streamed while it is being transcoded or if the conversion is interrupted. Even using conversion tools that put the "mov atom" at the start of the file for quick streaming require that the entire mp4 be encoded before that happens. Converting to an mp4 is simple, however, the entire file must be converted first before it is usable. I am trying to convert mythtv recorded mpg (mpeg2) files into streamable mp4 files.
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