[FFmpeg-trac] #4594(undetermined:new): Files created are the same size regardless of quality settings

FFmpeg trac at avcodec.org
Fri Jun 5 23:32:46 CEST 2015


#4594: Files created are the same size regardless of quality settings
-------------------------------------+-------------------------------------
             Reporter:  illumilore   |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 When running"
 ~/src/ffmpeg/ffmpeg -f pulse -i default -f video4linux2 -input_format
 mjpeg -s 960x720 -r 5 -i /dev/video0 -acodec vorbis -vcodec libx264
 -preset ultrafast -tune zerolatency -map 0:a -map 1:v
 http://127.0.0.1:8090/cam.ffm -f segment -segment_time 3600
 -segment_atclocktime 1 -reset_timestamps 1 -vcodec libx264 -r 5 -s 960x720
 -crf 40 -tune zerolatency -strict -2 -vf
 "drawtext='fontfile=/usr/share/fonts/truetype/DejaVuSans.ttf:fontcolor=white:fontsize=30:x=1:y=2:shadowx=1:shadowy=1:text=%{localtime\:%Y-%m-%d
 %H\\\\\:%M\\\\\:%S}'" -strftime 1 -acodec copy
 "/media/cam/%Y-%m-%d_%H-%M.mkv"

 that will create files that are 650MB, while using -crf 32 will also
 create files that are 650MB,even though the former is lower quality and
 should create much smaller files.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4594>
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