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• java.lang.NoClassDefFoundError : java.lang.ClassNotFoundException : org.bytedeco.javacpp.avutil

  7 avril 2016, par Saty

  I am finding this weird issue, I am using this(https://github.com/Bilibili/ijkplayer) library to play the RTMP. My App also includes the option to stream video as well for that I am using opencv and ffmpeg. I have included the below jar files to my libs folder for the streaming purpose and it was working well, I have added files from ijkplayer and its keep telling the error message

  If I make separate project for both, they are working !!

  ffmpeg-android-arm.jar
  ffmpeg-android-x86.jar
  ffmpeg.jar
  javacpp.jar
  javacv.jar
  opencv-android-arm.jar
  opencv-android-x86.jar
  opencv.jar
  videoinput.jar

  I am thinking that there must be a clash because both using FFMpeg so how can i detect that clash and resolve it ?

• How do I set total file duration generating a piped mp4 with ffmpeg ?

  9 avril 2021, par Mikhail Novikov

  My task is to generate (by piping, so that a file can be played at the same time with generation) an mp4 file which is a part of a larger file, with the result looking like a static file link, being seekable before it fully loads (i.e. supporting range headers).

  


  Here is how I do it now :

  


  ffmpeg -ss $1 -i teststream_hls1_replay.mp4 -t $2 -timecode $3 \
       -codec copy -movflags frag_keyframe+faststart -f mp4 pipe:1


  


  Result is OK (video starts from the right point) except the player does not see the total duration of a file so a controlbar looks weird, and seeking isn't possible properly, just because the controlbar jumps all the time.

  


  How do I indicate to ffmpeg that it has to set moov atom to contain right duration ?

  


  Basically the question boils down to : how do I force set some arbitrary duration of file in a moov atom, when I am generating a fragmented mp4 ? ffmpeg will not get know how long will it be, so explainably it can't do it itself, but I know... is there a command line parameters to specify a 'forced duration' ?

  


• ffmpeg empty video with low frame rate

  27 avril 2013, par Marco Gagliardi

  I've just downloaded ffmpeg since it seems to perfectly match my needs (make a video from a set of pictures). I'm currently playing around with some examples just to get started and there's something weird happening that I can't explain.
  I'm trying this command (provided in the official documentation) :

  ffmpeg -f image2 -pattern_type glob -i 'foo-*.jpeg' -r 12 -s WxH foo.avi

  on a data set of 10 jpg pictures (of course I changed the pattern with '*.jpg'). The video seems to be encoded correctly but it's simply too fast to be sure about that (anyway it stops on the last frame that corresponds to the last picture). In order to get a longer video i thought to low the frame rate from 12 to 1 (one sec each picture) or 0.5 (2 sec each one) and so on.. no way ! with low rate values even if the video is played the pictures are simply not displayed. The player (VLC in my case) just shows a blank/empty video for a few seconds.

  Am I making something wrong or have I misunderstood the -r parameter ? Is it something related to codecs involved ? Finally.. How can i get each picture displayed for 1 or 2 seconds ?

  Thank you !