Newest 'ffmpeg' Questions - Stack Overflow

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• Android FFMpeg No such file or directory error

  2 juin 2016, par GuyZ

  I am using ffmpeg for android (using the gradle plugin 'com.writingminds:FFmpegAndroid:0.3.2') and I am trying to crop a video to a 16:9 (w:h) ratio. The original video is 1080:1920 (w:h). When I execute the command I get an IOException No such file or directory.

  The command I am using:

  -i /storage/emulated/0/Movies/MyApp/result_joined.mp4 -vf crop=1080:607   -preset ultrafast /storage/emulated/0/Movies/MyApp/result_cropped.mp4
  

  The exception:

  java.io.IOException: Error running exec(). Command: 
  [/data/user/0/my.package.name/files/ffmpeg, -i, /storage/emulated/0/Movies/MyApp/result_joined.mp4, -vf, crop=1080:607, -preset, ultrafast, /storage/emulated/0/Movies/MyApp/result_cropped.mp4] Working Directory: null Environment: null
  Caused by: java.io.IOException: No such file or directory
  

  After searching several stack overflow questions with no help. I also tried to save files to internal storage instead of external storage. Same result

  Any help?

• How to record video from rtsp url of camera using ffmpeg libraries

  2 juin 2016, par samm

  Can anyone tell me How to record video from rtsp url of live camera using ffmpeg libraries in windows platform. in command line we are doing in this way

  ffmpeg -i rtsp://url -vcodec copy -b:v 2108k -t 10 -f avi out.avi

  but I want to do this using ffmpeg library functions.

  thanks in advance

• Conversion of H.264 media file to mp4

  2 juin 2016, par arceus

  I have a raw h264 file which I want to convert to mp4 format so that I can play them in any video player.But I am getting many errors when I use ffmpeg for this task. I have used the following command line to convert to mp4.

  ffmpeg -f h264 -i input.264 -vcodec output.mp4
  

  Below are the errors I get.

  missing picture in access unit with size 3273224
  no frame
  decoding for stream 0 failed
  could not find codec parameters for stream 0
  

  When I probe using ffprobe input.264 I get these errors.

  Missing picture in access unit with size 3273224
  No start code found
  Error splitting the input into NAL units
  decoding for stream 0 failed
  could not find codec parameters for stream 0
  

  I have checked other similar problems in this site but could not find the solution.I have added the file at http://s000.tinyupload.com/index.php?file_id=81246308569166574331

  Have a look at the video.

• ffmpeg concat poduces DTS out of order errors

  2 juin 2016, par Andy

  I'm following the documentation on how to concatenate files with ffmpeg but during the process I'm seeing lots of warning and the output video stops after the first chunk but the audio keeps on playing.

  This is the command I'm using to concatenate the files:

  ffmpeg -f concat -i mylist.txt -c copy output.webm
  

  This are the warnings I'm seeing:

  [concat @ 0x7fee11822a00] DTS 0 < 2500 out of order
  [webm @ 0x7fee11011000] Non-monotonous DTS in output stream 0:0; previous: 2500, current: 0; changing to 2500. This may result in incorrect timestamps in the output file.
  

  The video files are coming from an external source. My current solution is to re-encode every file sepeatly to mp4 and then to concatenate them together and then to re-encode the complete file back to webm. That, of cause, that takes some significant time but I can't find another solution.

• Unknown encoder libvpx [duplicate]

  2 juin 2016, par Justin Tullock

  This question already has an answer here:

  • Error ffmpeg and libvpx to convert to webm [closed] 1 answer

  I'm trying to convert gif to webm files. I use

  ffmpeg -i gif.gif -c:v libvpx -crf 12 -b:v 500K webm.webm
  

  which tells me Unknown encoder 'libvpx'

  But when I search libvpx, this is the output

  ========================= N/S matched: libvpx==========================
  libvpx-devel.i686 : Development files for libvpx
  libvpx-devel.x86_64 : Development files for libvpx
  libvpx.i686 : VP8 Video Codec SDK
  libvpx.x86_64 : VP8 Video Codec SDK
  libvpx-utils.x86_64 : VP8 utilities and tools
  

  So I did compile ffmpeg with libvpx correctly? Or did I miss something? Thank you for your help.