From terjejhanssen at gmail.com  Tue Jul  1 01:27:48 2025
From: terjejhanssen at gmail.com (Terje J. Hanssen)
Date: Tue, 1 Jul 2025 00:27:48 +0200
Subject: [FFmpeg-user] Cleaning up codeline to grab and record HDV video
 using Firewire/libiec61883
In-Reply-To: <9c2da9e5-6fca-4481-ad97-c84917a9f655@gmail.com>
References: <d78f6b82-f7b3-4dfe-97ec-b3b1bb1543f6@gmail.com>
 <0d01249f-8fd4-4a61-ae00-619dbbdc1e16@gmail.com>
 <98f3200d-69f8-467a-9df9-680c8796356c@gmail.com>
 <9c2da9e5-6fca-4481-ad97-c84917a9f655@gmail.com>
Message-ID: <8eae0233-a188-4a47-b185-3f7e2c574b27@gmail.com>



Den 30.06.2025 22:28, skrev BloodMan:
> Hello Terje,
>
>
> W dniu 2025-06-30 o 21:44, Terje J. Hanssen pisze:
> > Seemingly the most important missing part of the documentation's 
> example
> > code line
> > ffmpeg -f iec61883 -i auto -dvbuffer 100000 out.mpg
> > is "-c copy"
>
> Hmm... nope ;p
>
> "-c copy" do NOT convert at all, so you always get source codec on 
> output (when container support that codec, of course).

That was also the purpose, grab and record from hdv camcorder to hdv 
file without transcoding.

>
> AND
>
> .mpg container does NOT support MPEG-2 video (only MPEG-1), that's why 
> in the previous example ffmpeg converted mpeg2video to mpeg1video

Well, MPEG-1 or MPEG-2 (dvd.mpg)
https://www.adobe.com/creativecloud/file-types/video/container/mpg.html#what-is-an-mpg-file

>
> AND
>
> the "default" container that supports mpeg2video is .m2ts (then .ts)
>
>

According to the HDV specification the File extension is .m2t (generally)
https://en.wikipedia.org/wiki/HDV#Specifications

dvgrab uses .m2t for hdv default, and also a HDV HDD recorder like 
Datavideo DN-300 uses .m2t
According to Steve Mullens V1-FX7 Handbook:
When either is captured, the stream should have an .m2t file extension; 
but it may have an .mpg extension.




From bloodman at gmail.com  Tue Jul  1 03:08:01 2025
From: bloodman at gmail.com (BloodMan)
Date: Tue, 1 Jul 2025 02:08:01 +0200
Subject: [FFmpeg-user] Cleaning up codeline to grab and record HDV video
 using Firewire/libiec61883
In-Reply-To: <8eae0233-a188-4a47-b185-3f7e2c574b27@gmail.com>
References: <d78f6b82-f7b3-4dfe-97ec-b3b1bb1543f6@gmail.com>
 <0d01249f-8fd4-4a61-ae00-619dbbdc1e16@gmail.com>
 <98f3200d-69f8-467a-9df9-680c8796356c@gmail.com>
 <9c2da9e5-6fca-4481-ad97-c84917a9f655@gmail.com>
 <8eae0233-a188-4a47-b185-3f7e2c574b27@gmail.com>
Message-ID: <ecc5f063-79cf-461b-8d53-41ff43cf968b@gmail.com>

Hi,


W dniu 2025-07-01 o?00:27, Terje J. Hanssen pisze:
>> .mpg container does NOT support MPEG-2 video (only MPEG-1), that's why 
>> in the previous example ffmpeg converted mpeg2video to mpeg1video

> Well, MPEG-1 or MPEG-2 (dvd.mpg)
> https://www.adobe.com/creativecloud/file-types/video/container/mpg.html#what-is-an-mpg-file

In general yes, in real - it depends
(as you see in ffmpeg, and many other programs)

And do you remember what I wrote?
"do not use .mpg without codec tweaking"



>> the "default" container that supports mpeg2video is .m2ts (then .ts)

> According to the HDV specification the File extension is .m2t (generally)
> https://en.wikipedia.org/wiki/HDV#Specifications

m2ts is a newer version of m2t. m2t is just obsolete.
(in tv industry .ts is newer and better version of m2ts, for fun)


btw. I don't really know why we're arguing. You wanted explanations,
so I explained - it is as it is, not as you would like it to be.
According to http://me


-- 
Pozdrawiam,
bloodman at gmail.com