Folks,

I have a serious problem with rendering: I get `wavy' output, and due to my lack of knowledge I ask here for help how to avoid it.

mplayer gives this information about the input stream (which is raw DV):

libavformat file format detected.
[dv @ 0x90cbcd0] Estimating duration from bitrate, this may be inaccurate
[lavf] stream 0: video (dvvideo), -vid 0
[lavf] stream 1: audio (pcm_s16le), -aid 0
VIDEO: [dvsd] 720x576 0bpp 25.000 fps 28800.0 kbps (3515.6 kbyte/s)
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffdv] vfm: ffmpeg (FFmpeg DV)
==========================================================================
==========================================================================
Opening audio decoder: [pcm] Uncompressed PCM audio decoder
AUDIO: 48000 Hz, 2 ch, s16le, 1536.0 kbit/100.00% (ratio: 192000->192000)
Selected audio codec: [pcm] afm: pcm (Uncompressed PCM)
==========================================================================
AO: [oss] 48000Hz 2ch s16le (2 bytes per sample)

Here's a (cut) frame from the original DV:

http://yfrog.com/2fdvoriginalcutp

Starting a new project in kdenlive, using `768x576 4:3 PAL' as the profile (this should exactly fit the data from the stream, I believe), and rendering the input stream back to raw DV, 4:3 PAL, no other rendering option set, without applying any filter or transition (mplayer gives exactly the same information as for the input DV file), I get this:

http://yfrog.com/mwdvoutputcutp

My questions are:

. What is the right term for this distortion or problem?

. Why is this so? What is causing this?

. How can I avoid it?

I forgot to mention:

Qt: 4.7.1
KDE: 4.5.80 (4.6 Beta1)
Kdenlive: 0.7.8

I'm pretty sure this is caused by the interlaced input. This itself is not a problem, but then you scale the video, apparently before deinterlacing it (or without deinterlacing at all … did you select a progressive or an interlaced profile?).

ffmpeg says the stream is 720x576 and not 768x576.

Well, yes, the 720x576 -> 768x576 scaling is done by mplayer to correct the video aspect. However, both the input and output video have the same real 720x576 dimension, so no scaling is applied, I think.

The 768x576 4:3 PAL profile uses `progressive'. However, while rendering, I tried both the `interlaced' and `progressive' radio buttons, both in both cases I get the wavy output.

It seems that I miss something...

Fortunately, I found the solution: I have to use the profile DV/DVD PAL instead; somehow I missed this previously.

Thanks for the help!