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FLV joining possible?
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DarrellS
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Joined: 28 Nov 2002
Location: United States
Post Posted: Jun 16, 2008 16:05 Posts Comp View users profile Send private message Reply with quote
I used Movica and all of the joined FLVs were out of sync.

Can convert each separate FLV to AVI with Virtualdub and FLV input plugin and join the AVIs with AviDemux (virtualdub will not join the AVIs since they have different sampling rate 24.00001 and 24.00000) and the files are in sync. Only problem is that I have to manually add each AVI one at a time. It will not append 10 AVI files automatically like Virtualdub does.

EDIT: Something else I notice with a lot of FLV files is that they have a blurred out section on the bottom that needs to be cropped out. If you notice in the images below, the top image from the FLV player looks fine but the image from Virtualdub ( or the finished AVI ) is messed up. By cropping off the blurred bottom of the clip in Virtualdub, the two images will be the same size.





Placio74
Member


Joined: 22 Dec 2006
Location: Poland
Post Posted: Jun 17, 2008 07:04 Posts Comp View users profile Send private message Reply with quote
DarrellS wrote:
I used Movica and all of the joined FLVs were out of sync. ...

Movica not have restrictions for FLV.
However... of course, if You join FLV's with different FPS (or with VFR) - result is 'out of sync'.

DarrellS wrote:
... virtualdub will not join the AVIs since they have different sampling rate 24.00001 and 24.00000 ...

However... before You can use option - Convert to fps.

DarrellS wrote:
... Something else I notice with a lot of FLV files is that they have a blurred out section on the bottom that needs to be cropped out. If you notice in the images below, the top image from the FLV player looks fine but the image from Virtualdub ( or the finished AVI ) is messed up. By cropping off the blurred bottom of the clip in Virtualdub, the two images will be the same size. ...

http://forum.doom9.org/showthread.php?p=1125333#post1125333

DarrellS
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Joined: 28 Nov 2002
Location: United States
Post Posted: Jun 17, 2008 14:20 Posts Comp View users profile Send private message Reply with quote
Quote:
However... before You can use option - Convert to fps.


It's my experience that you have to remove the audio to get the fps change to work or it just keeps making a 24.00001 clip which will not append to the 24.00000 clip. Any way you look at it, it's a lot of work. Been asking Avery for years to put in an option to ignore the .00001 difference and append the files anyway but he's not too keen on the idea. The creator of AviDemux could make life a lot easier if his append feature joined multiple AVIs. AviDemux has no problem joining files that are slightly different but it will only join two at a time.

Placio74
Member


Joined: 22 Dec 2006
Location: Poland
Post Posted: Jun 17, 2008 14:54 Posts Comp View users profile Send private message Reply with quote
DarrellS wrote:
... AviDemux has no problem joining files that are slightly different but it will only join two at a time.

Odd...
I'm join 4 FLV's in Avidemux while ago...

DarrellS
Member


Joined: 28 Nov 2002
Location: United States
Post Posted: Jun 17, 2008 18:18 Posts Comp View users profile Send private message Reply with quote
I should have stated automatically. It's a PITA having to manually add 10 clips one at a time when you're working with multiple films. When Virtualdub works, it will add all sequential AVIs at once.

As for joining the FLVs with AviDemux, I have the same sync problems with these files as with Movica.

I have all the files converted and joined using the method I described earlier. It was just a lot more work than it needed to be. Only had one file that gave me sync issues and I used audio interleaving in Virtualdub to fix the problem.

Jean
Member


Joined: 11 Aug 2001
Post Posted: Dec 25, 2008 20:43 Posts View users profile Send private message Reply with quote
Baldrick wrote:
It worked also. Avidemux is the ultimate toooooool. smile.gif


I used Avidemux to join multiple flv and the output flv has serious sync problem. Is there better tool to join flv?

Thanks.

Placio74
Member


Joined: 22 Dec 2006
Location: Poland
Post Posted: Dec 26, 2008 01:14 Posts Comp View users profile Send private message Reply with quote
Jean wrote:
... Is there better tool to join flv?

I'm afraid, rather not - especially when source vid'a have variable frame rate (which is typical for FLV).
Unless... maybe after change container or after transcoding.

Jean
Member


Joined: 11 Aug 2001
Post Posted: Dec 26, 2008 10:03 Posts View users profile Send private message Reply with quote
Placio74 wrote:
Jean wrote:
... Is there better tool to join flv?

I'm afraid, rather not - especially when source vid'a have variable frame rate (which is typical for FLV).
Unless... maybe after change container or after transcoding.


Thank you.

I checked with avidemux that it is not variable frame rate. Would that make it better?

Placio74
Member


Joined: 22 Dec 2006
Location: Poland
Post Posted: Dec 26, 2008 13:12 Posts Comp View users profile Send private message Reply with quote
Jean wrote:
...I checked with avidemux that it is not variable frame rate.

What 'say' MediaInfo about FPS?
And FLV Extract show exactly same True Frame Rate and Avg Frame Rate?

FLV must be as output 'format'?

Maybe any FLV sample files?

Jean
Member


Joined: 11 Aug 2001
Post Posted: Dec 26, 2008 14:28 Posts View users profile Send private message Reply with quote
Placio74 wrote:
Jean wrote:
...I checked with avidemux that it is not variable frame rate.

What 'say' MediaInfo about FPS?
And FLV Extract show exactly same True Frame Rate and Avg Frame Rate?

FLV must be as output 'format'?

Maybe any FLV sample files?


Attached is the property.





Placio74
Member


Joined: 22 Dec 2006
Location: Poland
Post Posted: Dec 26, 2008 15:28 Posts Comp View users profile Send private message Reply with quote
15.002 FPS - it does not look good.

Waht's info from other apps (especially from FLV Extract)?
And what's other files FPS?

Look at this:


Jean
Member


Joined: 11 Aug 2001
Post Posted: Dec 27, 2008 10:06 Posts View users profile Send private message Reply with quote
[quote="Placio74"]15.002 FPS - it does not look good.

Waht's info from other apps (especially from FLV Extract)?
And what's other files FPS?





Placio74
Member


Joined: 22 Dec 2006
Location: Poland
Post Posted: Dec 29, 2008 06:06 Posts Comp View users profile Send private message Reply with quote
This appears to be another issue...

Some wrong with reading total video duration... and then 'wrong' calculating FPS...

6390 frames / 425,943 sec = 15,002 FPS


BTW
If You demux video to AVI used FLV Extract and open in Avidemux, I guess then show more accurately total video duration (~426 sec) and then calculate 15,000 FPS.


Unfortunately, I not see easy way and without issues to join FLV's.

---

I'm not sure how it will A/V sync, but maybe try MEncoder...?
Code:
mencoder -forceidx -of lavf -oac copy -ovc copy -o output.flv clip1.flv clip2.flv clip3.flv


Jean
Member


Joined: 11 Aug 2001
Post Posted: Dec 30, 2008 19:47 Posts View users profile Send private message Reply with quote
Thank you.

I tried to convert it using mencoder or Super. It is ok for a short video (a few min). It has a/v sync problem for a longer video.

Thought that it might be easy just join multiple flv. It seems no solution.

Thanks again for your help.

katipo
Member


Joined: 16 Apr 2009
Location: New Zealand
Post Posted: Apr 16, 2009 00:39 Posts Comp View users profile Send private message Reply with quote
Old topic, but I remember visiting here last year when I was looking for the same thing. I never found a perfect solution so wrote my own program instead. Hope it helps someone out.

Andy's FLV Joiner
http://ferretsoft.active.ws

What is it?
A simple Flash Video file joiner program.
Great for joining multi part video clips that you've downloaded. e.g. YouTube

What's so special about it?
- tiny and fast
- no recoding of the file
- no quality loss
- able to handle VBR files without audio sync problems
- free!

Baldrick
Administrator


Joined: 09 Aug 2000
Location: Sweden
Post Posted: Apr 16, 2009 03:27 Posts Comp View users profile Send private message Reply with quote
katipo wrote:
Old topic, but I remember visiting here last year when I was looking for the same thing. I never found a perfect solution so wrote my own program instead. Hope it helps someone out.

Andy's FLV Joiner
http://ferretsoft.active.ws

What is it?
A simple Flash Video file joiner program.
Great for joining multi part video clips that you've downloaded. e.g. YouTube

What's so special about it?
- tiny and fast
- no recoding of the file
- no quality loss
- able to handle VBR files without audio sync problems
- free!

It worked fine on standard flvs. Adding it it to our tools list, Andys FLV Joiner. Have you tried it with flvs with h264 video?

Last edited by Baldrick on Apr 16, 2009 11:45, edited 1 time in total
katipo
Member


Joined: 16 Apr 2009
Location: New Zealand
Post Posted: Apr 16, 2009 04:52 Posts Comp View users profile Send private message Reply with quote
Baldrick wrote:
It worked fine on standard flvs. Adding it it to our tools list, Andys FLV Join. Have you tried it with flvs with h264 video?

Hi, yes I've tested it with FLV1, VP6F and H264 formats.

The only caveat would be to make sure the clips use the same format.

Baldrick
Administrator


Joined: 09 Aug 2000
Location: Sweden
Post Posted: Apr 16, 2009 05:02 Posts Comp View users profile Send private message Reply with quote
katipo wrote:
The only caveat would be to make sure the clips use the same format.

Yep, but if you don't want to reconvert it's a requirement for most video format/containers.

katipo
Member


Joined: 16 Apr 2009
Location: New Zealand
Post Posted: Apr 26, 2009 02:28 Posts Comp View users profile Send private message Reply with quote
Version 0.2 of my FLV Joiner is now available. http://ferretsoft.active.ws

Changes:
Now removes all Meta tags (not just the first) from the start of each appended file (compatibility)
Tweaked Interface: timecode info, browse button, single progress bar
Speed and memory optimizations

Sorry if this is the wrong place for posting this, but I couldn't find how to update the details on the Tools page.

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