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• JavaCV RedHat Linux 6.6 x64 NoClassDefFound : Could not initialize class org.bytedeco.javacpp.avutil

  28 novembre 2015, par ChrisGeo

  I want to run a simple .flv to .mp4 conversion on a Linux machine

  Till now I was including the following dependencies and it was working fine on Ubuntu 12.x and CentOS

  <dependency>
  
     <groupid>org.bytedeco.javacpp-presets</groupid>
  
     <artifactid>ffmpeg</artifactid>
  
     <version>2.7.1-1.0</version>
  
     <classifier>linux-x86_64</classifier>
  
  </dependency>

  Red Hat uname -a

  x86_64 #1 SMP Tue Sep 16 01:56:35 EDT 2014 x86_64 x86_64 x86_64 GNU/Linux
  
  
  
  Red Hat lsb_release -a
  
  LSB Version:    :base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch
  
  Distributor ID: RedHatEnterpriseServer
  
  Description:    Red Hat Enterprise Linux Server release 6.6 (Santiago)
  
  Release:        6.6
  
  Codename:       Santiago

  CentOS uname -a

  .x86_64 #1 SMP Tue Nov 3 19:10:07 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

  However when trying it in RedHat Linux I get the following exceptions

  Application startup failed

  java.lang.NoClassDefFoundError: Could not initialize class org.bytedeco.javacpp.avutil
  
      at java.lang.Class.forName0(Native Method)
  
      at java.lang.Class.forName(Class.java:270)
  
      at org.bytedeco.javacpp.Loader.load(Loader.java:390)
  
      at org.bytedeco.javacpp.Loader.load(Loader.java:358)
  
      at org.bytedeco.javacpp.avformat$AVFormatContext.<clinit>(avformat.java:2539)
  
      at org.bytedeco.javacv.FFmpegFrameGrabber.startUnsafe(FFmpegFrameGrabber.java:383)
  
      at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:377)
  
      at com.example.Application.convert(Application.java:53)
  
      at com.example.Application.run(Application.java:103)
  
      at org.springframework.boot.SpringApplication.runCommandLineRunners(SpringApplication.java:674)
  
      at org.springframework.boot.SpringApplication.afterRefresh(SpringApplication.java:693)
  
      at org.springframework.boot.SpringApplication.run(SpringApplication.java:322)
  
      at org.springframework.boot.SpringApplication.run(SpringApplication.java:969)
  
      at org.springframework.boot.SpringApplication.run(SpringApplication.java:958)
  
      at com.example.Application.main(Application.java:28)
  
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
  
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  
      at java.lang.reflect.Method.invoke(Method.java:606)
  
      at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:53)
  
      at java.lang.Thread.run(Thread.java:745)
  
  </clinit>

  I tried with 32 bit version :

  <dependency>
  
     <groupid>org.bytedeco.javacpp-presets</groupid>
  
     <artifactid>ffmpeg</artifactid>
  
     <version>2.7.1-1.0</version>
  
     <classifier>linux-x86</classifier>
  
  </dependency>

  Same result.

  Then I tried with simply

  org.bytedeco
  javacv
  1.0

  and mvn package -Dplatform.dependencies=true so I got ALL dependencies.

  Still the same. Any one have an idea what I’m doing wrong ?

• Is it possible to merge multiple FFMPEG commands (cuts, slow down, watermark) into one in order to increase performance ?

  14 novembre 2022, par Nectarie PF

  I wrote a small piece of software in PHP, using FFMPEG commands via shell exec. The final purpose is to take a 7 seconds MP4 file from a GoPro and transform it in order to achieve a sort of boomerang effect :

  


  

  • crop the video to 1080 width/height

  


  


  ffmpeg -i ./files/video_small/$latestVideo -filter:v \"crop=1080:1080:420:0\" ./files/video_small/outcrop_$cod.mp4 2>&1");


  


  

  • first second should run normally

  


  


  ffmpeg.exe -t 1 -i ./files/video_small/outcrop_$cod.mp4 ./files/video_small/out1_$cod.mp4 2>&1");


  


  

  • the next two seconds will run at slow motion with a 2x factor

  


  


  ffmpeg.exe -ss 00:00:01 -t 2 -i ./files/video_small/outcrop_$cod.mp4 -filter_complex \"[0:v]setpts=2*PTS[v]\" -map \"[v]\" ./files/video_small/out2_$cod.mp4 2>&1");


  


  

  • the next second will speed up at 4x factor

  


  


  ffmpeg.exe -ss 00:00:03 -t 1 -i ./files/video_small/outcrop_$cod.mp4 -filter_complex \"[0:v]setpts=0.25*PTS[v]\" -map \"[v]\" ./files/video_small/out3_$cod.mp4 2>&1");


  


  

  • the next 2 seconds again slow motion

  


  


  ffmpeg.exe -ss 00:00:04 -t 2 -i ./files/video_small/outcrop_$cod.mp4 -filter_complex \"[0:v]setpts=2*PTS[v]\" -map \"[v]\" ./files/video_small/out4_$cod.mp4 2>&1");


  


  

  • final second again normal speed

  


  


  ffmpeg.exe -ss 00:00:06 -i ./files/video_small/outcrop_$cod.mp4 ./files/video_small/out5_$cod.mp4 2>&1");


  


  

  • concatenate the above parts to achieve the modified clip

  


  


  ffmpeg.exe -f concat -i ./files/video_small/files_$cod.txt -c copy  ./files/video_small/output1_$cod.mp4 2>&1");


  


  

  • then append the resulting clip in reverse

  


  


  ffmpeg -i ./files/video_small/output1_$cod.mp4 -filter_complex \"[0:v]reverse,fifo[r];[0:v][r] concat=n=2:v=1 [v]\" -map \"[v]\" ./files/video_small/output2_$cod.mp4 2>&1");


  


  

  • add watermark

  


  


  ffmpeg -i ./files/video_small/output2_$cod.mp4 -i ./files/watermark-video1080.png -filter_complex \"[0:v][1:v]overlay=(W-w)/2:10[outv]\" -map [outv] -c:v libx264 -crf 22 -preset veryfast ./files/video_small/output3_$cod.mp4 2>&1");


  


  

  • add audio (we can discard the original audio in any of the above steps)

  


  


  ffmpeg -i ./files/video_small/output3_$cod.mp4 -i ./files/video_small/sound-hip-hop.mp3 -map 0 -map 1:a -c:v copy -shortest ./files/video_small/output_final_$latestVideo 2>&1");


  


  Right now it runs ok, but I have a problem with performance, the whole process lasts about 50 seconds on my 8th gen i7.

  


  I am very new to the capabilities of ffmpeg and I was wondering if any of the below commands can be optimized or if any of the steps can be merged into one, as I can see the syntax is quite powerful.

  


  Thanks !

  


  I was expecting this to run a little bit faster, ideally half the time it takes right now.
As far as I have observed, the longest part is appending the resulting clip in reverse, perhaps I am adding something too heavy and unnecessary in the reverse filter.

  


• What is the best way to capture a screenshot from a udp stream ?

  8 novembre 2017, par yash17

  I’m trying to capture a screenshot from a udp stream using ffmpeg in a Ubuntu 14.04 System.
  Following is the command

  ffmpeg -y -i udp_ip -vframes 1 -q:v 1 test.png

  But the image captured is of very poor resolution and I observed a lag while taking the screenshot.

  Please suggest a best tool or a way to take a screenshot in the fastest way and also of the best image resolution possible.

  edit :
  log files

  ffmpeg version 3.3.2 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  
    configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libtheora --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab --enable-libwavpack --enable-nvenc
  
    libavutil      55. 58.100 / 55. 58.100
  
    libavcodec     57. 89.100 / 57. 89.100
  
    libavformat    57. 71.100 / 57. 71.100
  
    libavdevice    57.  6.100 / 57.  6.100
  
    libavfilter     6. 82.100 /  6. 82.100
  
    libavresample   3.  5.  0 /  3.  5.  0
  
    libswscale      4.  6.100 /  4.  6.100
  
    libswresample   2.  7.100 /  2.  7.100
  
    libpostproc    54.  5.100 / 54.  5.100
  
  [mpeg2video @ 0x390cc60] Invalid frame dimensions 0x0.
  
      Last message repeated 7 times
  
  Input #0, mpegts, from 'udp://@xxx.xx.xx.xx:xxxx':
  
    Duration: N/A, start: 144.130744, bitrate: 4128 kb/s
  
    Program 1 
  
      Metadata:
  
        service_name    : Program-1   
  
        service_provider: Encoder 
  
      Stream #0:0[0x42]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 720x576 [SAR 16:15 DAR 4:3], 4000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1[0x43]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 128 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg2video (native) -> png (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, image2, to 'player.png':
  
    Metadata:
  
      encoder         : Lavf57.71.100
  
      Stream #0:0: Video: png, rgb24, 720x576 [SAR 16:15 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc57.89.100 png
  
  frame=    1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A dup=1 drop=1 speed=0.729x    
  
  video:777kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown