Hi All, Toby, thanks for that suggestion (below). However... Would like to try aconv, but don't have it installed. Tried searching for it using Synaptic Package Manager, and found nothing. Have got lots of repositories added to my system, including all the ones recommended by MediBuntu. Am running Ubuntu 10.4 (Lucid). Yeah, yeah. Not running the latest version. (Will do a complete system rebuild after 14.4 gets to the 14.4.1 stage in July(?). Not looking forward to re-tweaking every setting on every application, and re-installing every codec and neat little extra utility.) In the mean time, anyone else have suggestions to my original post? Thanks very much. Carl On 24/02/14 16:04, Toby Corkindale wrote:
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
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