Don't you need to pass in some quality parameters for the codec? Also, I'd use avconv rather than mencoder myself. Try something like: avconv -i input.mkv -filter scale=960:540 -codec:a ac3 -b:a 192k -codec:v libx264 -profile:v high -crf 22 output.mkv But play with the -crf parameter to change quality level. You can also specific min and max bitrates. T On 24 February 2014 13:09, Carl Turney <carl@boms.com.au> wrote:
Hi All,
I've got a 3.9 GB video file that I want to reduce significantly in size.
I noticed the Nautilus >> Properties >> Audio/Video Properties on this file said the resolution was 1920 by 1080.
So I searched the web and found the suggestion to use mencoder -- which was already installed in my system.
Set the resolution to 960 x 540 and expected an output file of a bit more than 1/4 of the original file size.
Quite surprised to see that the output increased in size to 4.8 GB!
Any hints on how I can resize the resulting file down to about a quarter of the original?
I've got AVIDemux, GStreamer plugins and codecs, movieplayer, smplayer, pitivi, transmageddon, VLC media player, and apparently mencoder.
Thanks a lot,
Carl Bayswater
Here's the command I gave:
mencoder TWYDS1.mkv -vf scale=960:540 -oac pcm -ovc copy -o TWYDS2.mkv
Here's the resulting output:
MEncoder SVN-r1.0~rc3+svn20090426-4.4.3 (C) 2000-2009 MPlayer Team
WARNING: OUTPUT FILE FORMAT IS _AVI_. See -of help. success: format: 0 data: 0x0 - 0xf6de8583 [mkv] Track ID 1: video (V_MPEG4/ISO/AVC), -vid 0 [mkv] Track ID 2: audio (A_AAC), -aid 0, -alang eng [mkv] Will play video track 1. Matroska file format detected. VIDEO: [avc1] 1920x1080 24bpp 25.000 fps 0.0 kbps ( 0.0 kbyte/s) [V] filefmt:31 fourcc:0x31637661 size:1920x1080 fps:25.000 ftime:=0.0400 ========================================================================== Opening audio decoder: [faad] AAC (MPEG2/4 Advanced Audio Coding) FAAD: compressed input bitrate missing, assuming 128kbit/s! AUDIO: 48000 Hz, 2 ch, s16le, 128.0 kbit/8.33% (ratio: 16000->192000) Selected audio codec: [faad] afm: faad (FAAD AAC (MPEG-2/MPEG-4 Audio)) ========================================================================== videocodec: framecopy (1920x1080 24bpp fourcc=31637661) Writing header... ODML: Aspect information not (yet?) available or unspecified, not writing vprp header. Writing header... ODML: Aspect information not (yet?) available or unspecified, not writing vprp header. Pos: 1.4s 35f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.080 [152:1536] Skipping frame! ODML: Starting new RIFF chunk at 1023MB.: 3min 4834mb A-V:0.042 [6154:1536]] ODML: Starting new RIFF chunk at 2047MB.: 2min 4881mb A-V:0.043 [5848:1536] Pos:3390.6s 84765f (61%) 462.47fps Trem: 1min 4871mb A-V:0.080 [5901:1536] Skipping frame! ODML: Starting new RIFF chunk at 3071MB.: 1min 4870mb A-V:0.043 [5913:1536] ODML: Starting new RIFF chunk at 4095MB.: 0min 4899mb A-V:0.028 [5732:1536] Writing index...97f (99%) 474.61fps Trem: 0min 4925mb A-V:0.024 [5575:1536] Writing header... ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
Video stream: 5575.664 kbit/s (696957 B/s) size: 4047792233 bytes 5807.800 secs 145197 frames
Audio stream: 1536.000 kbit/s (192000 B/s) size: 1114841088 bytes 5806.464 secs
luv-main mailing list luv-main@luv.asn.au http://lists.luv.asn.au/listinfo/luv-main
-- Turning and turning in the widening gyre The falcon cannot hear the falconer Things fall apart; the center cannot hold Mere anarchy is loosed upon the world