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• Why does FFMPEG reports the wrong duration ?

  20 octobre 2011, par Adrian Lynch

  I have an oldish build of FFMPEG that I can't easily change.

  We use FFMPEG to find the duration of video and sound files. So far it has been working wonderfully.

  Recently on an uploaded file, FFMPEG has reported a 30 second file as being 5 minutes 30 seconds in length.

  Could it be something wrong with the file rather than FFMPEG ?

  If I use FFMPEG to convert to another file, the duration is restored.

  In case it matters, ffmpeg -i 'path to the file' produces :

      FFmpeg version Sherpya-r15618, Copyright (c) 2000-2008 Fabrice Bellard, et al.
        libavutil     49.11. 0 / 49.11. 0
        libavcodec    52. 0. 0 / 52. 0. 0
        libavformat   52.22. 1 / 52.22. 1
        libavdevice   52. 1. 0 / 52. 1. 0
        libswscale     0. 6. 1 /  0. 6. 1
        libpostproc   51. 2. 0 / 51. 2. 0
        built on Oct 14 2008 23:43:47, gcc : 4.2.5 20080919 (prerelease) [Sherpya]
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'H :\path\to\file.mov' :
        Duration : 00:05:35.00, start : 0.000000, bitrate : 1223 kb/s
          Stream #0.0(eng) : Audio : aac, 44100 Hz, stereo, s16
          Stream #0.1(eng) : Video : h264, yuv420p, 720x576, 25.00 tb(r)
      Must supply at least one output file
  

  It's that very command I use to then extract the duration with RegEx.

  Does anyone have a nice application that can do what I'm trying above but get it right 100% of the time ?

• Working way to make video from images in C#

  29 août 2011, par Jim Mischel

  Does anybody have a known reliable way to create a video from a series of image files ? Before you mod me down for not searching for the answer before posting the question, and before you fire off a simple message like "use FFMPEG," read the rest of this message.

  I'm trying to create a video, it doesn't matter too much what format as long as it's widely supported, from a series of images (.jpg, .bmp, etc.). My platform is Windows Server 2008, 64-bit. If I can make the video from within my C# program, that's great, but I'm not averse to writing a series of image files to a directory and then firing off an external program to make a video from those images.

  The only constraints are : it must work on my Windows Server 2008 system, and be scriptable. That is, no GUI programs that require operator intervention.

  I found a number of similar questions on StackOverflow, and have tried several of the solutions, all with varying degrees of frustration and none with anything like success.

  FFMPEG looks like a great program. Maybe it is, on Linux. The two Windows builds I downloaded are broken. Given this command line :

    ffmpeg -r 1 -f image2 -i jpeg\*.jpg video.avi

  One of the builds reads the images and then crashes due to data execution prevention. The other reads the first file and then spits out an error message that says "cannot find suitable codec for file jpeg/image2.jpg". Helpful, that. In any case, FFMPEG looks like a non-starter under Windows.

  One answer to a previous posting recommended Splicer . It looks like pretty good code. I compiled the samples and tried to run, but got some cryptic error message about a file not found. It looks like a COM class isn't registered. I suppose I need to install something (DirectShow, maybe, although I thought that was already installed ?). Depending on what's required, I might have a difficult time justifying its installation on a server. ("What ? Why do you need that on a server ?")

  Another answer suggested the AviFile library from Code Project. That looks simple enough : a wrapper around the Windows AviFile subsystem. Except that the AVI files the package creates appear to have all of the frames, but only the first frame shows when I play the AVI in Windows Media Player. Well, that and if you try to create a compressed video, the program throws an exception.

  So, I'm left wondering if there is a good, reliable way to do what I want : on a Windows system, create an AVI or other common video file format from a series of images, either through a .NET API or using an external program. Any help ?

• Error while transcoding using FFMPEG from MXF to mp4

  27 mai 2015, par jasper

  I am using FFmpeg 0.6.3 in command line to transcode files from one format to another in windows server 2008.But when i try to convert mxf file to mp4 format. i am getting the following error message

  ffmpeg error while opening encoder for output stream #0.1 - maybe incorrect parameters such as bit_rate, rate, width or height

  ffmpeg command that is used to transcode
  ffmpeg -y -i "inputfile.mxf" -t 30 -s 640x360 output.mp4 -t 30 -s 1280x720 output2.mp4