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• FFmpeg can't access file in Dropbox on Ubuntu 12.04

  30 juin 2015, par afterglowlee

  I have installed FFmpeg on Ubuntu 12.04. When I use ffmpeg -i command to check some video file online, it works :

  ffmpeg -i http://techslides.com/demos/sample-videos/small.mp4

  However, when I check a public file hosted in my Dropbox it gives ’No such file or directory error’ :

  ffmpeg -i https://dl.dropboxusercontent.com/u/51617581/bigbuck.webm

  and the error is :

  https://dl.dropboxusercontent.com/u/51617581/bigbuck.webm : No such
  file or directory

  and here is the version info of the ffmpeg installation :

  ffmpeg version 0.8.17-4:0.8.17-0ubuntu0.12.04.1, Copyright (c)
  2000-2014 the Libav developers built on Mar 16 2015 13:26:50 with
  gcc 4.6.3

  I have also tried both files on my Mac 10.10 laptop, and both of them work fine. Could anyone suggest where is the problem ? Many thanks.

• Best Codec and Pixel Formats to use in FFMPEG Pipeline

  19 décembre 2022, par user20623229

  I have created an FFMPEG Pipeline to stream video frames to an RTSP server. The frames are RGB frames with 3 dimensions. My pipeline command is as follows :

  


  openPipeLine = _popen("ffmpeg -f rawvideo -r 30 -video_size 720x1280 -pixel_format bgr24 -i pipe: -vcodec libx264 -crf 24 -pix_fmt yuv420p -f rtsp rtsp://localHost:8554/mystream", "w");


  


  I can barely make out the picture when I connect to the server via VLC Media. The colors seem scrambled. I've attached a sample image and the output on the server.

  


  Are there any recommended Codec's that I can use to solve this ? Perhaps the pixel format should be changed. I'm currently using a Codec and pixel format that I found online without knowing if these are the best options.
original frame
server output

  


  Thank you very much.

  


• ffmpeg convert video to size 275x157 pixels [closed]

  21 janvier 2024, par degr

  I want to make video of exact size 275x157, but ffmpeg always make it 274x156.

  


  So far I try next list of commands :

  


  //it from my opinion, it should make vide of my size, and add padding if necessary, but result is same - 274x156
ffmpeg -i ScreenRecorderProject7.mkv  -strict -2 -filter:v "pad=275:157:(275-iw*min(275/iw\,157/ih))/2:(157-ih*min(275/iw\,157/ih))/2" WrathTrailer1334x750.mp4

//more advanced variant of previous command, not work also
ffmpeg -i ScreenRecorderProject7.mkv  -strict -2 -filter:v "pad=275:157:(275-iw*min(275/iw\,157/ih))/2:(157-ih*min(275/iw\,157/ih))/2" WrathTrailer1334x750.mp4

//it told width is not divisible by 2
ffmpeg -i ScreenRecorderProject5.mkv -strict -2 -vf scale=275x157 -aspect 1.75259 output.mp4

//in description it was mentioned it add 1px pad, but I feel it is wrong; result incorrect
ffmpeg -i ScreenRecorderProject5.mkv -strict -2 -vf pad="width=ceil(iw/2)*2:height=ceil(ih/2)*2" output.mp4


  


  Also I try to do so with movavi video editor, streamlabs and couple online video converters and always I'm getting wrong resolution. Cant understand what is wrong with that numbers