Re: [Mjpeg-users] glav error opening .avi file

[Bernhard P. <ber...@gr...>]

Hallo,

I digged it up from a older mail:
Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID /
0x44495658),
yuv420p, 800x592 [SAR 1:1 DAR 50:37], 896 kb/s, 30 fps, 30 tbr, 30 tbn,

I'm not sure what kind source you have: because the size is with 800x592 
a little bit strange. That is neither PAL not NTSC or SECAM

If you want to encode the result for video please try a command like 
that assuming you have a 4:3 source:
 > cat stream.yuv │ yuvscaler -O DVD | yuv2lav -I 0 -q 90 -f q -o
video_without_sound.qt &

Depending on the source video you might need to add the -n p/s/n 
p=pal,s=secam,n=ntsc switch to yuvscaler.

If it lookes strange please add the output from the commands to the 
mail. Add to yuvscaler and yuv2lav: -v 2 so the output is more verbose.



Janos G Komaromi wrote:
> Sorry to bother this community again with a follow up question:
> 
> Now that glav works I have visually noticed a difference between the
> original (compressed) file and the glav-compatible (huge) file. In
> order to confirm my suspicion I issued the command:
> ffprobe -v error -show_format -show_streams <both versions>
> and compared the outputs - see attached diff.txt file.
> 
> It is obvious that
> (a) width and height ratio is changed (lines 12-13 vs 19-20);
> (b) yuv420p vs yuvj422p (lines 26 vs 33) - maybe not relevant for visual
> appearance;
> (c) time base (lines 42 vs 44) - this explains the bloated size, do we
> need this, and if not, how to leave it as original?
> 
> Obviously, only item (a) is important, the rest is mainly for my
> curiosity and better understanding of the digital video concepts.
> 
> Janos
> 
> 
> On Wed, 19 Oct 2022 14:36:58 -0400
> "Janos G. Komaromi" <ja...@ja...> wrote:
> 
>> Thanks. Yes, glav works with -a 0.
>>
>> As far as /dev/dsp is concerned I may have to recompile kernel to
>> include oss drivers. I'll keep on working the sound part, but for my
>> most immediate editing tasks sound output is not that important.
>>
>> Thanks again for all you support and also for Stephen's idea of ffmpeg
>> method of simmply cutting out a section of the original (compressed)
>> .avi file.
>>
>> Best to all,
>>
>> Janos
>> PS - please add my other email address
>> ja...@an...
>> to members of your mailing list.
>>

-- 
auf hoffentlich bald,

Berni the Chaos of Woodquarter

Email: ber...@gr...
www: http://www.lysator.liu.se/~gz/bernhard