he1ix' blog

• select your preferred pictures and copy them to a separate folder
• start digikam and select all pictures
• use ‘Image‘ -> ‘Auto Rotate/Flip using EXIF Information‘ to correct the orientation of the images (this is required since otherwise the resizing step will produce bad results)
• open ‘Batch‘ -> ‘Resize Images‘
• select ‘Type‘ : Proportional (2-dim) with the options width=1024, height=720, border=0
• click ‘Apply‘

my panasonic dmc-fx10 produces videos in apple’s quicktime-format (.MOV), which are quite huge so i’d like to recompress the files on my desktop, preferrably without losing (too much) of the alread not-so-good quality…

for tasks like this, i prefer using avidemux, since i don’t have to bother with all the possible (and impossible!) combinations of mencoder’s commandline options… unfortunately, avidemux can’t read the files produced by the cam directly, it quits with an /assertion error/

thus, the files need to be converted first. to do this, i use the above mentioned without the huge bunch of options:

mencoder $file -oac pcm -ovc raw -o ${file/MOV/RAW}

now avidemux can work on the raw video-files and produce much smaller files than the cam directly (oh wonder…)

some experimenting show the following settings lead to satisfying results:

VIDEO: MPEG-4 AVC (x264)
Encoding Mode: Two Pass - Average Bitrate
Average bitrate (kb/s): 1800

yes, i know… one could simply look up the parameters for mencoder and do the whole stuff in one step… maybe later

Neben avidemux und pspvc kann man (IMHO am besten) mit dem Mencoder Videos für die Playstation Portable umkodieren, die resultierende Datei muss als M4V####.MP4 ins passende Verzeichnis auf der PSP kopiert werden:

mencoder -ofps 30000/1001 -af lavcresample=24000 -srate 24000 \
-vf harddup,scale=368:208 -of lavf -oac lavc -ovc lavc -lavcopts \
aglobal=1:vglobal=1:vcodec=mpeg4:acodec=libfaac:abitrate=64:vbitrate=768 \
-lavfopts format=psp \
-info "name=Movie Title" \
-o <M4V.OUTPUTFILE.MP4> \
<INPUTFILE>

Mit dem folgenden Befehl wird noch das dazugehörige Thumbnail erstellt, das als M4V####.THM abgelegt werden muss (seektime ist in Sekunden, Dezimalwerte gehen auch).

ffmpeg -y -i <M4V.INPUTFILE.MP4> \
-f image2 -vframes 1 -s 160x120 \
-an <M4V.OUTPUTFILE.THM> \
-ss <SEEKTIME>

Zusätzliche Infos gibt’s im movingparts-blog