[FFmpeg-user] Poor quality of screencast 1920x1200 on Linux

Bogdan Lotko boguslaw.lotko at chello.at
Mon Apr 28 23:14:01 CEST 2014


I've tried to make a screencast to demonstrate a running software.
I am working on SLES11 installed on Lenovo W500 laptop. The screen 
resolution is 1920x1200.
I've compiled and installed libx264 (/usr/local/lib) and ffmpeg with 
libx264 of course.

I've tried to use following commands:
ffmpeg -f x11grab -r 30 -s 1920x1200 -vb 2000 -i :0.0  -threads 0 
ffmpeg -f x11grab -s 1920x1200 -framerate 25 -vb 2000 -i :0.0 -vb 2000  
ffmpeg -framerate 30 -video_size 1920x1200 -f x11grab -vb 2000 -i :0.0 
-vcodec libx264 -crf 0 -preset ultrafast output.xxx

where xxx was:
  -  mkv
  - flv
  - mp4 (with -vcodec libx264 -crf 0 -preset ultrafast was not readable)
  - avi

I've also tried all above commands with the frame rate 25.

With some exceptions (last command and mp4 output file) I've got usable 
output files, but the quality was a big problem: blurred pixels - so 
that the texts were hardly readable, and
video seems to run too fast (the second is not critical)

My questions:
  - Is it at all possible to make the screencasts with so high screen 
  - If yest how to do it?
  - I am absolutely new in this topics, so please write me  what kind of 
input do you need to be able to help me?

thank you in advance for your help,

with best regards


*Bogdan Lotko*

b.lotko at chello.at
Phone: +43 1 2852458
Mobile: +43 676 6615012

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