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• Fixing a corrupted .MP4 file. which might be a 3gp file

  2 juin 2020, par Tendekai Muchenje

  I have a file called input.MP4 and it is corrupted. It's from a CCTV camera. I tried everything, ffmpeg, VLC convert, no luck. However, I used mediainfo and exiftool and extracted the following info. I am wondering if someone can figure out if I can use any of this info to fix it or convert it to a usable format. I have a copy of it here on my Google Drive

  



  mediainfo gave me this :

  



  General
Complete name                       : input.MP4
Format                              : MPEG-4
Format profile                      : 3GPP Media Release 5
Codec ID                            : 3gp5 (3gp5/3gp4/avc1/mp42/isom)
File size                           : 5.77 MiB
IsTruncated                         : Yes


  



  exiftool gave me this :

  



  ExifTool Version Number          : 10.80
File Name                        : input.MP4
Directory                        : /home/tendi/Downloads
File Size                        : 5.8 MB
File Modification Date/Time      : 2018:07:21 19:09:03-04:00
File Access Date/Time            : 2018:07:21 19:30:48-04:00
File Inode Change Date/Time      : 2018:07:21 19:30:48-04:00
File Permissions                 : rw-rw-r--
File Type                        : 3GP
File Type Extension              : 3gp
MIME Type                        : video/3gpp
Major Brand                      : 3GPP Media (.3GP) Release 5
Minor Version                    : 0.0.0
Compatible Brands                : 3gp5, 3gp4, avc1, mp42, isom
Movie Data Size                  : 5899106
Movie Data Offset                : 44


  



  Any suggestions ?

  


• Unable to find a suitable output format while cutting video

  22 juillet 2018, par Java Android

  I am using below command to cut video-

  String complexCommand = new String[]{"-y", "-i", yourRealPath, "-ss", "" + startMs / 1000, "-t", "" + (endMs - startMs) / 1000, "-c", "copy", filePath};

  I got below error -

  "ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers\n
  built with gcc 4.8 (GCC)\n configuration : —target-os=linux
  —cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi-
  —arch=arm —cpu=cortex-a8 —enable-runtime-cpudetect —sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot
  —enable-pic —enable-libx264 —enable-libass —enable-libfreetype —enable-libfribidi —enable-libmp3lame —enable-fontconfig —enable-pthreads —disable-debug —disable-ffserver —enable-version3 —enable-hardcoded-tables —disable-ffplay —disable-ffprobe —enable-gpl —enable-yasm —disable-doc —disable-shared —enable-static —pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config —prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a —extra-cflags=’-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include
  -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all’ —extra-ldflags=’-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib
  -Wl,-z,relro -Wl,-z,now -pie’ —extra-libs=’-lpng -lexpat -lm’ —extra-cxxflags=\n libavutil 55. 17.103 / 55. 17.103\n libavcodec 57. 24.102 / 57. 24.102\n libavformat 57. 25.100 /
  57. 25.100\n libavdevice 57. 0.101 / 57. 0.101\n libavfilter 6. 31.100 / 6. 31.100\n libswscale 4. 0.100 / 4. 0.100\n libswresample 2. 0.101 / 2. 0.101\n libpostproc 54. 0.100 /
  54. 0.100\nInput #0, mov,mp4,m4a,3gp,3g2,mj2, from ’/storage/emulated/0/Download/file3gpp.3gpp’ :\n Metadata :\n
  major_brand : 3gp4\n minor_version : 0\n
  compatible_brands : isom3gp4\n creation_time : 2018-04-09
  12:04:29\n com.android.version : 7.1.1\n Duration : 00:00:04.88,
  start : 0.000000, bitrate : 1425 kb/s\n Stream #0:0(eng) : Audio : aac
  (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 96 kb/s (default)\n
  Metadata :\n creation_time : 2018-04-09 12:04:29\n
  handler_name : SoundHandle\n[NULL @ 0xf622a600] Unable to find a
  suitable output format for
  ’/storage/emulated/0/Movies/cut_video.3gpp’\n/storage/emulated/0/Movies/cut_video.3gpp :
  Invalid argument\n"

  Why am i getting this error and how can i resolve it ?

• Ubuntu 16.04 + OpenCV + FFMPEG + CUDA don't open default camera

  20 juillet 2018, par Newton Pasqualini Filho

  I am trying to work with accelerated OpenCV using my own build of FFMPEG with CUDA support for GPU video processing using Python.

  My application must support any kind of video devices, including USB and IP cameras.

  I have a config file parsed with ConfigParser that loads the camera device path, as described in OpenCV documentation we can access usb camera by index number and for IP camera we use RTSP protocol so the path could be sometimes 0 or rtsp://192.168.1.2/0.

  To force the use of FFMPEG behind OpenCV I am trying to open the video capture stream like bellow :

  video_capture = cv.VideoCapture()
  
  stream_opened = video_capture.open(camera_path, cv.CAP_FFMPEG)

  The problem is when I try to open the default USB camera camera_path = 0 the video_capture.open method always returns false, but when it is a RTSP like camera_path = "rtsp://192.168.1.2/1" it open the video capture stream ok.

  When I let OpenCV decide what backend will be used it calls to GStreammer and it opens the capture stream like this :

  video_capture = cv.VideoCapture(camera_path)

  I suspect that FFMPEG does not have any support for capture video from a USB camera, does it ? Is there some missing feature to my ffmpeg build ?

  ffmpeg version N-91487-g1809f1c Copyright (c) 2000-2018 the FFmpeg developers
  
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  
  configuration: --prefix=/usr --pkg-config-flags=--static --enable-cuda-sdk --enable-cuvid --enable-libnpp --extra-cflags=-I/usr/local/cuda/include/ --extra-ldflags=-L/usr/local/cuda/lib64/ --nvccflags='-gencode arch=compute_61,code=sm_61 -O2' --enable-gpl --enable-libass --enable-libfdk-aac --enable-libx264 --extra-libs=-lpthread --enable-libx265 --enable-nvenc --enable-nonfree
  
  libavutil      56. 18.102 / 56. 18.102
  
  libavcodec     58. 21.105 / 58. 21.105
  
  libavformat    58. 17.101 / 58. 17.101
  
  libavdevice    58.  4.101 / 58.  4.101
  
  libavfilter     7. 26.100 /  7. 26.100
  
  libswscale      5.  2.100 /  5.  2.100
  
  libswresample   3.  2.100 /  3.  2.100
  
  libpostproc    55.  2.100 / 55.  2.100
  
  Hyper fast Audio and Video encoder
  
  usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...