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• Multiple image and multiple mp3 to mkv

  25 janvier 2019, par hafsel

  I need your help.

  image-folder >

  image1.jpg

  image2.jpg

  image3.jpg

  mp3-folder >

  mp31.mp3

  mp32.mp3

  mp33.mp3

  How can I combine them?

  image1.jpg + mp31.mp3 = video1.mkv

  image2.jpg + mp32.mp3 = video2.mkv

  image3.jpg + mp33.mp3 = video3.mkv

  My codes working for single image and multiple mp3.

  for %%a in ("*.mp3") do ffmpeg -loop 1 -framerate 1 -i image.jpg -i "%%a" -c:v libx264 -preset veryslow -crf 0 -c:a copy -shortest "out\%%~na.mkv"
  

  Please help me!

• Copy PTS from original video stream to processed video stream using ffmpeg and opencv

  25 janvier 2019, par Krishna Prasad Yellapragada

  I have two video files in webm format. First is the original video, captured using Chrome's MediaRecorder API. The second is a processed video generated by processing each frame of the original video using OpenCV. How do I override the PTS of frames in processed video with PTS from original video. The number of frames between the two is same.

  The processed video is generated from a sequence of images using ffmpeg.

  ffmpeg -i frames/frame_%d.png -pix_fmt yuv420p ffmpeg-cfr.mp4
  

  This results in a CFR of 25fps. I have tried using the steps from the link, Can I create a VFR video from timestamped images?. This only works on mp4 videos, and not on webm. The process of encoding to MP4 and converting back to webm results in very bad video quality and takes 3x time for each video.

  Along with the sequence of images, I am also writing the PTS of the original video for each frame in a timecodes.txt file. Are there any options in ffmpeg similar to mp4fpsmod (https://github.com/nu774/mp4fpsmod)? I expect that when I dump block-wise timestamps in webm for original video and processed video, the PTS for each block match between the two.

• GSM HR decode visual studio

  25 janvier 2019, par Acrobat

  I use FFmpeg to decode AMR-NB. GSM-HR decoding is required (half rate 112 bit). Please tell me the library for GSM-HR decoding for visual studio c ++.

• Finding ffmpeg installed version

  25 janvier 2019, par JBWanscher

  I have a cross machine script which needs to detect the version of ffmpeg as a regular version string (e.g. 2.3.8-1 or 4.1.3-0). The command

  ffmpeg -version 
  

  returns a host of most likely very relevant information to others, but this is much more than what I need.

  ffmpeg version 2.8.15-0ubuntu0.16.04.1 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 --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  libavutil      54. 31.100 / 54. 31.100
  libavcodec     56. 60.100 / 56. 60.100
  libavformat    56. 40.101 / 56. 40.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 40.101 /  5. 40.101
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.101 /  1.  2.101
  libpostproc    53.  3.100 / 53.  3.100
  

• How to compress video at client side before uploading it to server without installing anything at client side ?

  25 janvier 2019, par Harpreet singh Bains

  We have application in which client have to upload video using interface so we just want to compress that video at client side before upload it to server , without installing anything at client machine . It this possible ,if possible then how??

  i have used ffmpeg javascript compiles code too but for that also we have to install ffmpeg locally.