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Zubziro
Apprentice
Joined: 21 Sep 2005
Posts: 248
Location: Sweden
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 Posted: Tue Nov 25, 2008 9:39 pm Post subject: [SOLVED] DV to mpeg2 without deinterlance possible ? |
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HI
I have a number of DV files with 50i rate, is there any way to convert those to intelaced "as is" mpeg ?
tried with ffmpeg:
| Code: |
ffmpeg -threads 2 -i $input_file -sameq -target pal-dvd $mpeg_name
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but result looks strange on TV it's like movie become 25fsp
ffmpeg says:
| Code: |
Input #0, dv, from '/serve/videoarchive/original/othem/othem49.dv':
Duration: 01:30:26.56, start: 0.000000, bitrate: 28800 kb/s
Stream #0.0: Video: dvvideo, yuv420p, 720x576, 28800 kb/s, 25.00 tb(r)
Stream #0.1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
File '/serve/videoarchive/processed/videowork/othem/othem49.mpeg' already exists. Overwrite ? [y/N] y
Output #0, dvd, to '/serve/videoarchive/processed/videowork/othem/othem49.mpeg':
Stream #0.0: Video: mpeg2video, yuv420p, 720x576 [PAR 59:54 DAR 295:216], q=2-31, 6000 kb/s, 25.00 tb(c)
Stream #0.1: Audio: ac3, 48000 Hz, stereo, s16, 448 kb/s
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Any ideas ??
Thanks
Last edited by Zubziro on Fri Nov 28, 2008 6:54 am; edited 1 time in total |
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flybynite
l33t
Joined: 06 Dec 2002
Posts: 620
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| Posted: Wed Nov 26, 2008 12:04 am Post subject: Re: DV to mpeg2 without deinterlance possible ? |
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| Zubziro wrote: |
but result looks strange on TV it's like movie become 25fsp
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I've been caught by this before 
both ffmpeg and mencoder have a default output framerate so by not specifying one, it used the default of 25fps.
| Quote: | `-r fps'
Set frame rate (Hz value, fraction or abbreviation), (default = 25).
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Zubziro
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Joined: 21 Sep 2005
Posts: 248
Location: Sweden
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| Posted: Wed Nov 26, 2008 8:29 am Post subject: Re: DV to mpeg2 without deinterlance possible ? |
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| flybynite wrote: | | Zubziro wrote: |
but result looks strange on TV it's like movie become 25fsp
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I've been caught by this before
both ffmpeg and mencoder have a default output framerate so by not specifying one, it used the default of 25fps.
| Quote: | `-r fps'
Set frame rate (Hz value, fraction or abbreviation), (default = 25).
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Thanks for answer !!
I rtied to run:
| Quote: | | ffmpeg -threads 2 -r 50 -i $input_file -sameq -target pal-dvd -r 50 $mpeg_name |
But output is still strange, it's looks like input DV defaults to 25fps anyway but output is 50fps 
| Code: |
Input #0, dv, from '/serve/videoarchive/original/othem/othem5.dv':
Duration: 00:31:17.20, start: 0.000000, bitrate: 28800 kb/s
Stream #0.0: Video: dvvideo, yuv420p, 720x576, 28800 kb/s, 25.00 tb(r)
Stream #0.1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
File '/serve/videoarchive/processed/videowork/othem/othem5.mpeg' already exists. Overwrite ? [y/N] y
Output #0, dvd, to '/serve/videoarchive/processed/videowork/othem/othem5.mpeg':
Stream #0.0: Video: mpeg2video, yuv420p, 720x576 [PAR 59:54 DAR 295:216], q=2-31, 6000 kb/s, 50.00 tb(c)
Stream #0.1: Audio: ac3, 48000 Hz, stereo, s16, 448 kb/s
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Any sugesstion would be appreciated. |
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fangorn
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Joined: 31 Jul 2004
Posts: 1886
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| Posted: Wed Nov 26, 2008 11:57 am Post subject: |
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Are you using dv streams directly or are you using avi container?
AVI only supports full frame AFAIK.
Use dvgrab to store RAW DV stream to harddisk for a test.
Also MPEG2 is _capable_ of handling interlaced material. But I don't know if there are special parameters that have to be set for a specific encoder. Try different encoders with different settings (lavc or mpeg2enc IIRC).
Edit:
On second thought I think I remember reading something that DV is specified with full frames with either 25 fps for PAL or 30 fps for NTSC. As it uses a JPEG algorithm to compress the single frames this also makes sense. So there would be only full frames in the source material.
My DV camera has a deinterlacer built in, but that does not always produce good picture. As I mostly used it to record analog video I have quite some experience with interlacing artifacts. So I started always deinterlacing the material accepting the slight blur it adds to the picture.
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Video Encoding scripts collection | Project page |
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Zubziro
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Joined: 21 Sep 2005
Posts: 248
Location: Sweden
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| Posted: Wed Nov 26, 2008 2:26 pm Post subject: |
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Thanks for you answers.
I tried many apps with different settings without success
I just put it this way:
Is there anybody who knows how to convert 50i DV (thi is actualy quicktime DV file) to 50i mpeg2 with best possible quality ?
I'm not so familliar with transcoding and already spend about 2 weeks of trying
Thanks |
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Zubziro
Apprentice
Joined: 21 Sep 2005
Posts: 248
Location: Sweden
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| Posted: Fri Nov 28, 2008 6:54 am Post subject: |
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| Zubziro wrote: | Thanks for you answers.
I tried many apps with different settings without success
I just put it this way:
Is there anybody who knows how to convert 50i DV (thi is actualy quicktime DV file) to 50i mpeg2 with best possible quality ?
I'm not so familliar with transcoding and already spend about 2 weeks of trying
Thanks |
It looks like I finaly did it:
| Code: |
ffmpeg -threads 2 -top -1 -i $inputfile -sameq -target pal-dvd -flags ilme $outputfile
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`-top n'
top=1/bottom=0/auto=-1 field first
`-ilme'
Force interlacing support in encoder (MPEG-2 and MPEG-4 only). Use this option if your input file is interlaced and you want to keep the interlaced format for minimum losses. The alternative is to deinterlace the input stream with `-deinterlace', but deinterlacing introduces losses.
This produces highesh quality of mpeg2 video compatible with DVD whit "amazing" process speed of 1fps on my 3,2 Ghz SMP server. So be patient |
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