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• How to iterate over a certain patter of file names to use it on FFMPEG and PowerShell

  26 novembre 2019, par Francisco Laferrière

  I’m fairly inexperienced with PowerShell and I use it in certain occasions when I need to have total control of the conversion needed.
  So, I am facing a problem where I have a collection of 20 videos. All share the same number pattern from 1300 to 1319, and I want to convert the whole collection of "MOV" files into "MP4" files using this command :
  ffmpeg -i my-video-1300.mov -vcodec h264 -acodec mp2 my-video-1300.mp4

  Is there a way to use a Regular Expression, wildcard, or whatever name is given to simply create a single line conversion command.
  My idea of what it "should look like" is :
  ffmpeg -i my-video-13[00-19].mov -vcodec h264 -acodec mp2 my-video-13[00-19].mp4

  Of course this last line doesn’t work, but I would like to learn the correct way of doing it.
  Thanks.

• Videos written with moviepy on amazon aws S3 are empty

  10 avril 2019, par cellistigs

  I am working on processing a dataset of large videos ( 100 GB) for a collaborative project. To make it easier to share data and results, I am keeping all videos remotely on an amazon S3 bucket, and processing it by mounting the bucket on an EC2 instance.

  One of the processing steps I am trying to do involves cropping the videos, and rewriting them into smaller segments. I am doing this with moviepy, splitting the video with the subclip method and calling :

  subclip.write_videofile("PathtoS3Bucket"+VideoName.split('.')[0]+'part' +str(segment)+ '.mp4',codec = 'mpeg4',bitrate = "1500k",threads = 2)

  I found that when the videos are too large (parameters set as above) calls to this function will sometimes generate empty files in my S3 bucket ( 10% of the time). Does anyone have insight into features of moviepy/ffmpeg/S3 that would lead to this ?

• php - convert avi to mp4, webm and flv using ffmpeg command

  5 juin 2015, par Aisha

  My problem is I am trying to convert and upload videos into three formats at upload button. I am stuck at the very first step when i am trying to convert avi to mp4, webm and flv. I have tried various commands to convert in to mp4 and webm but nothing worked. its converting to flv smoothly. i searched a lot on internet but none of the commands worked. i have set execution_time to 0 and set_time_limit(0) as well for unlimited execution time. here are the commands i tried to convert in to mp4 and webm

  **For mp4:**
  
  
  
  exec("ffmpeg -i input.avi -c:v libx264 -crf 19 output.mp4");
  
  exec("ffmpeg -i input.avi -c:v libx264 -pix_fmt yuv420p output.mp4");
  
  exec("ffmpeg -i input.avi -c:v libx264 -c:a libfaac \ -movflags +faststart output.mp4");
  
  
  
  **For webm** 
  
  passthru("ffmpeg -i input.avi output.webm");
  
  passthru("ffmpeg -i input.avi -b 1500k -vcodec libvpx -acodec libvorbis -ab 160000 -f webm -g 30 output.webm");

  Note :
  For avi to mp4 files that are less than 1mb are converting successfully but more than 1mb files are showing its converting but its size is 0bytes.

  Similarly, i am facing a problem in converting mp4 to flv. Some files are converting and some are not. Some of the large files are converting but some small files are not converting. It was strange. there was no problem of permission or php configuration settings all was fine. I tried renaming a file which was not converting and it got uploaded. I am confused why this happened.

  Any help for both the issues is highly appreciated.

  Thanks in advance.

  Edited
  /bin$ ffmpeg -v
  ffmpeg version 0.10.15 Copyright (c) 2000-2014 the FFmpeg developers
  built on Aug 30 2014 15:49:19 with gcc 4.4.7 20120313 (Red Hat 4.4.7-3)
  configuration : —prefix=/usr —bindir=/usr/bin —datadir=/usr/share/ffmpeg —incdir=/usr/include/ffmpeg —libdir=/usr/lib64 —mandir=/usr/share/man —arch=x86_64 —extra-cflags=’-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector —param=ssp-buffer-size=4 -m64 -mtune=generic’ —enable-bzlib —disable-crystalhd —enable-gnutls —enable-libass —enable-libcdio —enable-libcelt —enable-libdc1394 —disable-indev=jack —enable-libfreetype —enable-libgsm —enable-libmp3lame —enable-openal —enable-libopenjpeg —enable-libpulse —enable-librtmp —enable-libschroedinger —enable-libspeex —enable-libtheora —enable-libvorbis —enable-libv4l2 —enable-libx264 —enable-libxvid —enable-x11grab —enable-avfilter —enable-postproc —enable-pthreads —disable-static —enable-shared —enable-gpl —disable-debug —disable-stripping —shlibdir=/usr/lib64 —enable-runtime-cpudetect
  libavutil 51. 35.100 / 51. 35.100
  libavcodec 53. 61.100 / 53. 61.100
  libavformat 53. 32.100 / 53. 32.100
  libavdevice 53. 4.100 / 53. 4.100
  libavfilter 2. 61.100 / 2. 61.100
  libswscale 2. 1.100 / 2. 1.100
  libswresample 0. 6.100 / 0. 6.100
  libpostproc 52. 0.100 / 52. 0.100
  Missing argument for option ’v’