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• FFmpeg's -movflags produces invalid duration in [moov] box

  31 août 2016, par LYF

  I am trying to make an MP4 file suitable for HTML5 streaming. I am trying to mux an FLV file into a fragmented MP4, with correct metadata in its first moov box.

  I used the command line parameters in this article on the MDN :

  ffmpeg -i h264aac.flv -c copy -movflags frag_keyframe+empty_moov fragmented.mp4

  Then I fed this fragmented.mp4 slowly into an HTML5 SourceBuffer. The video played for one second and stopped. (stopped at its second key frame ?)

  I looked at the MP4 file in Bento’s mp4info tool and found that there is an incorrect duration in the moov box :

  Movie:
  
  duration:   0 ms
  
  time scale: 1000
  
  fragments:  yes

  Then I tried :

  ffmpeg -i h264aac.flv -c copy -movflags frag_keyframe+faststart new_fragmented.mp4

  However, the new_fragmented.mp4 only has 5 seconds. It should have 90 seconds.

  > mp4info new_fragmented.mp4
  
  
  
  Movie:
  
  duration:   5182 ms
  
  time scale: 1000
  
  fragments:  yes

  I also found on stackoverflow a working movflags used in live streaming :

  -movflags empty_moov+omit_tfhd_offset+frag_keyframe+default_base_moof

  Now the video can be played, but the player does not know the video’s duration until the video is completely downloaded.

  > mp4info stackoverflowSolution.mp4
  
  
  
  duration:   0 ms
  
  fragments:  yes
  
  
  
  Codecs String: avc1.640028
  
  Codecs String: mp4a.40.2

  My goal is make an MP4 file that can be played and has a correct duration when I stream it. I tried switching parameters, adding and removing + signs, but there are too many combinations, and I was not lucky enough to run into a working one by guessing.

  I can generate a fully playable and glitch-less MP4 file using mp4fragment, but I would like to know how to do so in FFmpeg.

• FFmpeg -movflags produces invalid duration in MP4 [moov] box

  31 août 2016, par LYF

  I am trying to make an MP4 file suitable for HTML5 streaming. I am trying to mux an FLV file into a fragmented MP4, with correct metadata in its first moov box.

  I used the command line parameters in this article on the MDN :

  ffmpeg -i h264aac.flv -c copy -movflags frag_keyframe+empty_moov fragmented.mp4

  Then I fed this fragmented.mp4 slowly into an HTML5 SourceBuffer. The video played for one second and stopped. (stopped at its second key frame ?)

  I looked at the MP4 file in Bento’s mp4info tool and found that there is an incorrect duration in the moov box :

  Movie:
  
  duration:   0 ms
  
  time scale: 1000
  
  fragments:  yes

  Then I tried :

  ffmpeg -i h264aac.flv -c copy -movflags frag_keyframe+faststart new_fragmented.mp4

  However, the new_fragmented.mp4 only has 5 seconds. It should have 90 seconds.

  > mp4info new_fragmented.mp4
  
  
  
  Movie:
  
  duration:   5182 ms
  
  time scale: 1000
  
  fragments:  yes

  I also found on stackoverflow a working movflags used in live streaming :

  -movflags empty_moov+omit_tfhd_offset+frag_keyframe+default_base_moof

  Now the video can be played, but the player does not know the video’s duration until the video is completely downloaded.

  > mp4info stackoverflowSolution.mp4
  
  
  
  duration:   0 ms
  
  fragments:  yes
  
  
  
  Codecs String: avc1.640028
  
  Codecs String: mp4a.40.2

  My goal is to make an MP4 file that can be played and has a correct duration when I stream it. I tried switching parameters, adding and removing + signs, but there are too many combinations, and I was not lucky enough to run into a working one by guessing.

  I can generate a fully playable and glitch-less MP4 file using mp4fragment, but I would like to know how to do so in FFmpeg.

• How to convert an mjpeg live video format to h.264 format using ffmpeg without increasing the playback speed

  7 janvier 2020, par Greeshma R

  I have a live mjpeg video stream that I need to be recorded and play in a browser. I am using FFmpeg to record from the HTTP URL using the below command.

  ffmpeg -i http://127.0.0.1:5005/hdmi/vflipped/1 -c:v copy Output.mp4

  But the recorded video Output.mp4 is not getting played in any browser. (tried with chrome and firefox)
  On a search I just found few suggestions to convert the mjpeg codec to h.264 codec.
  So I have converted the mjpeg format to h.264 format to get played in a browser using the below command.

  ffmpeg -i http://127.0.0.1:5005/hdmi/vflipped/1 -vcodec libx264 output.mp4

  But this increased the speed of the recorded video.

  Can anyone suggest any other way to play the recorded video in the browser ?