Would be great to have a video intro of D featuring a mix of testimonies from a few folks, fragments from the existing DConf materials, etc. Some of that cool ukulele upbeat music, too. Anyone would enjoy taking up such a project? -- Andrei

On 23/05/2017 9:23 PM, Andrei Alexandrescu wrote:
> Would be great to have a video intro of D featuring a mix of testimonies
> from a few folks, fragments from the existing DConf materials, etc. Some
> of that cool ukulele upbeat music, too. Anyone would enjoy taking up
> such a project? -- Andrei

If you can provide the raw footage, I'm sure a few of us will give it a go (I have licenses for music which I can use for this stuff).

rikki cattermole <rikki@cattermole.co.nz> wrote:
> On 23/05/2017 9:23 PM, Andrei Alexandrescu wrote:
>> Would be great to have a video intro of D featuring a mix of testimonies from a few folks, fragments from the existing DConf materials, etc. Some of that cool ukulele upbeat music, too. Anyone would enjoy taking up such a project? -- Andrei
> 
> If you can provide the raw footage, I'm sure a few of us will give it a go (I have licenses for music which I can use for this stuff).
> 

I'm thinking publicly available videos so the footage is already out there.

On Wednesday, 24 May 2017 at 09:27:59 UTC, Andrei Alexandrescu wrote:
> I'm thinking publicly available videos so the footage is already out there.

Public available videos are already compressed. Rikki needs the original source video and audio.

Working on a compressed video to create another compressed video, simply result in lower quality video ( and less professional looking ).

On Wednesday, 24 May 2017 at 10:04:03 UTC, Wulfklaue wrote:
> Working on a compressed video to create another compressed video, simply result in lower quality video ( and less professional looking ).

 Only if you have to recompress it. Some tools like VirutalDub allow you to chop and copy without altering the data stream (it's good for taking out commercials or shortening clips). Although I wouldn't be surprised if you wanted to add a logo, do some fading or some fancy stuff, at which point direct stream copying won't work.

On 05/27/2017 06:19 PM, Era Scarecrow wrote:
> On Wednesday, 24 May 2017 at 10:04:03 UTC, Wulfklaue wrote:
>> Working on a compressed video to create another compressed video, simply result in lower quality video ( and less professional looking ).
> 
>   Only if you have to recompress it. Some tools like VirutalDub allow you to chop and copy without altering the data stream

Good point. Although, AIUI, that does leave you limited to cutting only on full frames, not on the delta frames. Sometimes that's an issue, sometimes it isn't.

On Saturday, 27 May 2017 at 22:28:13 UTC, Nick Sabalausky (Abscissa) wrote:
> On 05/27/2017 06:19 PM, Era Scarecrow wrote:
>> On Wednesday, 24 May 2017 at 10:04:03 UTC, Wulfklaue wrote:
>>> Working on a compressed video to create another compressed video, simply result in lower quality video ( and less professional looking ).
>> 
>>   Only if you have to recompress it. Some tools like VirutalDub allow you to chop and copy without altering the data stream
>
> Good point. Although, AIUI, that does leave you limited to cutting only on full frames, not on the delta frames. Sometimes that's an issue, sometimes it isn't.

Right, that's why we need 60kfps so these types of issues do not cause major life threatening problems.

On Saturday, 27 May 2017 at 22:28:13 UTC, Nick Sabalausky (Abscissa) wrote:
> Good point. Although, AIUI, that does leave you limited to cutting only on full frames, not on the delta frames. Sometimes that's an issue, sometimes it isn't.

 Well you can cut anywhere (on the tail end anyways), while the starts have to be on full frames, which you can expect to be probably within ever 40 frames. I've noted large changing scenes (like dropping to black or changing camera angles) it will often goes to full frames.

 Then there's the disadvantage that if you're working with multiple videos/samples, they have to be at the same data rate, same resolution, and the same encoding, I've seen VirtualDub barf and refuse to join two videos regarding a 0.01 difference in framerate (otherwise they were both 24fps).

 But I'll let someone more proficient and practiced in video editing than me to take this up. My editing skills (and software I've used) is like that of a butcher with a meat cleaver: It's messy but does the [simple] job.

On Wednesday, 24 May 2017 at 09:27:59 UTC, Andrei Alexandrescu wrote:
> I'm thinking publicly available videos so the footage is already out there.

One question I'd want to ask is: What is the legal status of the resulting video?

This is purely because of software licensing. My nonlinear editing of choice is Davinci Resolve, but I've only ever done it for hobby projects that make no money. In the case of providing a video authored with the software to the D Foundation, I'm not entirely sure the "free" license covers such usage.

(I also doubt I'd have the time to devote to cutting a video at this stage, but it's the first question I thought of when viewing this thread.)

Am Sat, 27 May 2017 22:19:11 +0000
schrieb Era Scarecrow <rtcvb32@yahoo.com>:

>   Only if you have to recompress it. Some tools like VirutalDub
> allow you to chop and copy without altering the data stream (it's
> good for taking out commercials or shortening clips). Although I
> wouldn't be surprised if you wanted to add a logo, do some fading
> or some fancy stuff, at which point direct stream copying won't
> work.

Ok, but even then your source material would ideally have to be encoded with the same codec and parameters. A different resolution would not work, while a change in frame rate is tolerable.

H.264 also makes cutting on I-frames more difficult than
previous codecs as they don't clear the reference frame
buffer. So following frames could still reference frames before
the cut, resulting in artifacts. An actual keyframe for
the start of the video, jumping to chapters or seeking is now
called IDR (Instantaneous Decoder Refresh), which is also an
I-frame, hence why old cutting tools like VirtualDub don't see
the difference.

Another low cost video editor that offers "smart rendering" without re-encoding is PowerDirector. They provide an option to use only IDR-frames or any I-frame for cuts (as you would do in VirtualDub), for cases where in your source material they are _actually_ proper keyframes with no cross-references. I tried the latter on footage shot with a Sony digicam and it resulted in a broken video stream. So unless you know that every I-frame is an IDR in your sources it is not advisable to use them as cut points.

-- 
Marco