[NTLUG:Discuss] Resolved ... sort of ... Re: OT Kdenlive

[Fred James]

Wayne Walker wrote:
> On Fri, Jun 25, 2010 at 11:38:25PM -0500, Fred James wrote:
>   
>> Oops ... I think I see the problem ...
>>    format=avi vcodec=dvvideo ildct=1 pix_fmt=yuv411p
>> acodec=pcm_s16le size=720x480 profile=dv_ntsc
>> ... but if I change size to size=320x240, or 320x200, or 360x240, I
>> get a 9.6 KB file that of course doesn't work
>>
>> Any hints ... googling hasn't helped so far
>>     
>
> Major hint:
>
> mpeg, mov, and avi are envelope formats.  like tar, ar, and zip (w/o the
> compression).  mpeg, mov, and avi do not define the audio and video
> codecs used to encode the audio and video streams.
>
> mpeg2, mpeg3, mpeg4, mjpeg, etc. are video codecs, they define the
> quality and size of the video stream.
>
> mp3, aac, ogg, etc. are audio codecs, they define the
> quality and size of the audio stream.
>
>   
>> Regard
>> Fred James
>>
>> Fred James wrote:
>>     
>>> I have an avi file from my camera that 23.4 MB (320x240)
>>> I used Kdenlive to cut the clip into 2 parts, and exported the
>>> parts as avi again
>>> Each of the parts was larger than the original by about half again
>>>
>>> I used Kdenlive to export the same original file as mpeg (320x200
>>> - high quality)
>>> The resulting mpeg file is less than one third the size of the original
>>>
>>> Am I doing something wrong?
>>> Regards
>>> Fred James
>>>       
OT resolved ... sort of ... it seems that there is more latitude in 
copying and editing the mpeg formats than there might be for the DV 
(AVI) formats in Kdenlive, and I have found a result that satisfies my 
needs by doing that. The original camera output is 320x240 and Kdenlive 
(for avi) wants to make that 720x480 or (for mpeg) 320x200, neither of 
which match the original proportions all that closely. But adding a 
custom output format that is a copy of one of the mpeg formats, and 
changing the ratio to match the original ... Bingo! Don't know why that 
wouldn't work for avi, but I have what I want ... smaller files, 
original ratio, commonly accepted format ... Thanks
Regards
Fred James