This forum has been archived. All content is frozen. Please use KDE Discuss instead.

DNxHD rendering vs. transcoding

Tags: None
(comma "," separated)
thomi_ch
Registered Member
Posts
2
Karma
0

DNxHD rendering vs. transcoding

Wed Jan 20, 2010 11:01 pm
Hello

I playing around with MTS files.
My MTS files are from a sony cam: HDR-XR500VE, AVCHD, 1080 Full HD.
To work with my clips in kdenlive, i know, that it's better to use MOV files.. so installed the DNxHD render profiles.

Now i found different quality between rendering the time line with a single MTS file with lossless DNxHD and transcoding the same MTS file with DNxHD.

Rendering: DNxHD 1920x1080 220Mb/s Options: s=1920x1080 aspect=@16/9 b=220000k vcodec=dnxhd acodec=pcm_s16le
Transcoding: DNxHD 1920x1080 60i/30p 220Mb/s Options: -s 1920x1080 -r pal -b 220000k -threads 2 -vcodec dnxhd -acodec copy %1.mov

If i render the MTS file with above settings/profile, i get a perfect quality to use in kdenlive.
If i transcode the same MTS with above transcode profile.. it get waves in the MOV file (see attached files, just screenshots)... and the file size is different then that one i have created with the render profile.

Can someone explain that.. give me more information how to really convert my MTS to MOV without waves.. and without adding each one to the timeline and render each one it self?.. have a lot of MTS files.. so i need a batch processing something else..

Thanks for Information..

thomi


ddennedy
Registered Member
Posts
1315
Karma
1

Re: DNxHD rendering vs. transcoding

Mon Feb 01, 2010 8:43 am
Unfortunately, it seems that the transcode loses the information that the video is interlaced. Then, when kdenlive loads it, it thinks that it is progressive scanning, and does not deinterlace it. Rendering it causes it to be deinterlaced depending on your project or render settings.

The fix is to change the transcode profile to add "-flags +ildct+ilme". This means I need to revise the transcode profiles and split them to create progressive and interlaced ones.




Bookmarks



Who is online

Registered users: abc72656, Bing [Bot], daret, Google [Bot], Sogou [Bot], Yahoo [Bot]