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• Running ffmpeg command in Android gives Protocol not found error for image path

  29 mars 2019, par Abdul Mateen

  I am trying to use ffmpeg from Android command line to convert images into video. I have stored my sequence of images on sdcard. When I run ffmpeg command to convert images into video, ffmpeg command give me error Protocol not found.

  My command is like this :

  /data/data/package/files/ffmpeg -r 40 -qscale 2 -i /mnt/sdcard/images/img%d.jpg /mnt/sdcard/images/finalvideo.mp4

  Error is like this /mnt/sdcard/vid.mp4: Protocol not found

  I found the same error message mentioned in error.c file. But I am not getting the type of error and condition when it throws the error. Also when I run ffmpeg command i.e. ffmpeg -protocols from Android and Linux, the number of supported protocols are not same.

  I found file and many protocols missing in Android.

• avformat/concat : Check protocol prefix

  20 janvier 2016, par Michael Niedermayer

  avformat/concat : Check protocol prefix
  Reviewed-by : Andreas Cadhalpun <andreas.cadhalpun@googlemail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/concat.c

• FFmpeg concat protocol and keyframes

  11 janvier 2023, par Rems

  I am trying to use to the concat protocol but I have troubles with keyframes

  


  I use this ffprobe command to visualize the keyframes pts of my videos :

  


  ffprobe -loglevel error -select_streams v:0 -show_entries packet=pts_time,flags -of csv=print_section=0 inout.mp4  | awk -F',' '/K/ {print $1}'

  


  Here is my process : I have the original video, with these keyframes :

  


  0.000000 5.000000 9.760000 14.240000  18.440000 ...

  


  I trim the first 5 seconds, so the output has these keyframes :

  


  0.000000 4.760000 9.240000 13.440000 ...

  


  I create a 5 seconds video by looping an image, with the same parameters/codec... that were used to produce the original video. This video just has one keyframe at 0.000000

  


  Then I concat this video with the trimmed video like this :

  


  ffmpeg -f concat -safe 0 -i list.txt -c copy -shortest  output.mp4 -y

  


  But when I look for the keyframes of the output video, I get this :

  


  0.021016 5.035000 9.795000 14.275000 ...

  


  Is this behavior normal ? Should I add a parameter to handle keyframes during concatenation ? Thanks