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• Use FFMPEG to create video from jpeg, and index using vlc

  16 novembre 2011, par Greg

  OpenSuse 11.4
  FFMEG 0.8.5

  I'm using FFMPEG to create a 5 minute mpeg from about 2100 individual jpegs (7fps). I've been using the following command (OpenSuse 11.4)
  /usr/bin/ffmpeg -y -r 7.01 -i %03d-capture.jpg -s 800x600 -r 25 Event-3692-r1-s1-3.mpg

  Now I Try to open the file (In windows XP with VLC 1.1.11 Player).
  Media->AdvancedFileOpen
  *I select "Show more options" and set StartTime to 5s. I expect that the video should start 5 seconds in, but instead it starts at a seemingling random (although consistent) time of 30 seconds in.

  I also tried changing ffmpeg command to :
  /usr/bin/ffmpeg -sameq -y -r 7.01 -i %03d-capture.jpg -s 800x600 -r 25 Event-3692-r1-s1-3.mpg
  *This result in about a constant 2x offset (5sec => 10sec) (10s => 20s) etc. But filesize is also about 6x larger, which is a strain on my storage.

  I also tried
  /usr/bin/ffmpeg -y -r 7.01 -i %03d-capture.jpg -s 800x600 -r 25 -f mpegts Event-3692-r1-s1-3.mpg
  *This result in vlc not indexing at all into my video. Also not desired. Anybody have any clues what is going on here. It is very important for me to be able to use this VLC feature and have it work correctly.

  Thanks in advance

• FFmpeg : Reading data from 2 FIFO

  21 septembre 2019, par user3497661

  I am working with FFmpeg 4.1.3. I am trying to read video from one named pipe and audio from another named pipe and creating a new output file. There are 2 RTP processes reading data over the network and writing it to these pipes.

  I am using following commandline
  ffmpeg -report -i /tmp/audio_pipe.pcmu -i /tmp/video_pipe.h264 -y output.ts
  When I try to receive from individual pipes,
  (ffmpeg -report -i /tmp/audio_pipe.pcmu -y output.ts), it works but using 2 pipes in the same command line seems to block.
  I found some 7 year old ticket https://trac.ffmpeg.org/ticket/1663. It says that multiple pipes do not work with FFmpeg.

  I would like to know if input using multiple pipes works with FFmpeg now and if yes, how to achieve it.

• Detect duplicate frames to create seamless loops in FFMPEG

  19 septembre 2017, par Yasath Dias

  I feel like this should be possible, after I saw a method created with MoviePy for Python (this article). Essentially, I want to import an MP4 at 1920x1080 with say 12000kbps bitrate and have FFMPEG detect when there are duplicate frames that aren’t consecutive and export each one of these small sequences to small individual MP4 files that loop seamlessly (the first frame is almost the same as the last frame like this one).

  A 1920x1080 file may be far too large (in resolution) to process, so I would be fine with downscaling that to around 120px wide. Also, I know that FFMPEG can detect duplicate frames because I’ve often used mpdecimate previously.

  I hope I described the issue well enough, but will be willing to clarify, of course :)