FLV Extract

[fuxxi]

Hi Moitah,

thank You for this great small and perfect working tool!


Can You update the program to support extraction via context menu in windows explorer or at least automatically extraction if I open an flv file with the program?

Maybe You can add some options to set some parameters like handling for files automatically opened by FLV Extract?

I use it only to extract audio files and its not the fastest way to open the program and then drag files to the program. This can be done faster.

[Foofaraw]

Yes, excellent and simple - thanks Moitah just what I needed

[Lighto]

Excellent project, is it possible to add support for nellymoser audio extraction?

[BugiBugBug]

I've noticed something with FLV Extract that could be strange or maybe intended behaviour; at least I do not get it.

I got two parts of a clip in FLV - it contains H264 and AAC (LC) streams.
According to FLV Extract, the framerate is 29,70 (average frame rate is a bit lower with 29,661).

If I remux the FLVExtracted H264&AAC using the timecode file in MKVmerge, the resulting file has a 30.003 frame rate and is 1h20min. long - regardless of whether I set the frame rate to 29.97.

If I remux the streams without using the timecode nor the framerate setting, the resulting file is 29.70 fps, duration however -still- 1h20min.

If I remux the streams without the timecode file, but with the 29.70 setting, the resulting fps is actually 29.70, and the total duration is -still- 1h20min.

Mediainfo tells me all files are CFR. Results are the same regardless of using FLVJoiner before extracting and muxing.

Do you think this could be a bug in timecode file generation?

[sneaker_ger]

The first two or three timecodes of flv files are often "0", while all other timecodes equal 1000/(30/1.001) (there's some jitter due to limited precision). That's why these strange average framerates, like "30.003", are displayed. I don't really know if that can be considered a bug. It could be a problem that people encounter during the creation process of the flv. A test I've done once showed no a/v sync problems when assuming constant 30/1.001, but I don't know if this applies to all flv files. I'm also interested in a definite explanations on this issue.

[Mosu]

Also read my FAQ entry about "frame rate" in Matroska files. Short answer: there is no frame rate in a Matroska file.

[BugiBugBug]

Originally Posted by Mosu

Also read my FAQ entry about "frame rate" in Matroska files. Short answer: there is no frame rate in a Matroska file.

Thank you for the heads-up. I would understand this to mean that a setting like 29,70 in the second tab of mkvmerge is actually not directly used, but translated in internal frame duration.

Still this does not explain why the duration of the files stays the same with any setting, since 30.003-29.70 is 2,3 frames per second faster. on a 1 hour 20 min. file, this should show differences in length, it seems to me.

Since the FLV is clearly CFR, I've ultimately muxed the file without using the timecode file, and setting 30/1001. This produced a fine mkv with a/v in sync.

[sneaker_ger]

Originally Posted by BugiBugBug

Still this does not explain why the duration of the files stays the same with any setting, since 30.003-29.70 is 2,3 frames per second faster. on a 1 hour 20 min. file, this should show differences in length, it seems to me.

30.003 fps - 29.97 fps = 0.033 fps, not 2.3 fps

Also don't forget that the duration is usually the difference of time between the start and the end of the longest track, which could be the audio track. You wouldn't see any difference then.

And 30.003 fps is the average framerate, not necessarily a constant framerate. In this case constant 29.97 fps with a negative delay at the beginning (as mentioned in my other post), so you should never just fill in the average framerate into mkvmerge GUI's fps field.

[Mosu]

Originally Posted by BugiBugBug

Thank you for the heads-up. I would understand this to mean that a setting like 29,70 in the second tab of mkvmerge is actually not directly used, but translated in internal frame duration.

That is correct.

Still this does not explain why the duration of the files stays the same with any setting

Because timecode files always override the --default-duration setting.

[GimmeAreason]

Wow. I remembered about this tool today when trying for a while to get the audio out of a file that claimed to be flv video yet had no video apparently. I had downloaded it from the bbc stream..supposedly an audio file but they made it video and most players except mpc (which I use anyway) wouldn't touch it! Your program instantly left me with an ACC file and that's it!
THANK YOU, great software

[jofori89]

Sorry for not asking the author first. I has just download source code and add some features
Since this tool has not been updated for a long time, today morning I opened this program to extract some FLV from youtube. But it lacks of some detail information on GUI, so I thought of adding something into it:

FLV Extract version 1.7.0:



- Add list of added file with check box, this allows people add many files from various folders, select or deselect files that not need to extract, before really starting the process.

FLV Extract 1.7 Download
-
Download With source code

I'm thinking of adding a feature like allow people automatically/immediately remux extracted flv files to mp4/mkv (with some settings)

[b66pak]

@jofori89 thanks a lot...

Originally Posted by jofori89

I'm thinking of adding a feature like allow people automatically/immediately remux extracted flv files to mp4/mkv (with some settings)

that would be very usefull...
_

[jofori89]

Thank for your feedback

Added this program to Google Code, now you guys can download it (and source code) from there.
http://code.google.com/p/flv-extraxct/

FLV Extract version 1.71 (June 09 2012):

Change log:
-Allow people drag and drop folders, files and both in the same time into files list.
-Fix drag&drop multi files bug that not allow to add all of them.

Download

[Chetwood]

Originally Posted by jofori89

I'm thinking of adding a feature like allow people automatically/immediately remux extracted flv files to mp4/mkv (with some settings)

Absolutely! +1.

[jofori89]

Update:
Done with Mp4 remuxing (mp4box) (allow change framerate) function.

I have a question like this "How to set Aspect ratio by mp4box?)
like this?

-par 1=16:9 / par 1=X:Y

[jofori89]

FLV Extract version 2.0.1
(June 11 2012):
http://code.google.com/p/flv-extraxct/

Front-end FLV extract and mp4/mkv remuxing GUI software.

Require:
- .Net 2.0 (if using XP).
- Mkvmerge.exe for mkv remuxing.
- mp4box.exe for mp4 remuxing.

Change log:
- MKV / MP4 remuxing extracted FLV files option is now available.
- Allow auto clean temp files.
- Fix some glitch.

Screenshoots:





Download:
http://code.google.com/p/flv-extraxct/downloads/list

Need tester for this

[[ReX]]

Seems to be working fine, but I only tested with YouTube files so far.

If the timecodes are extracted, are they used when muxing?
If so, should they be removed along with audio and video after muxing?

Is it possible to allow it to remux just the audio to mp4?
Raw AAC doesn't work everywhere so I have to mux it into a mp4 container.

And can you disable always on top or make a setting for it?

[jofori89]

If the timecodes are extracted, are they used when muxing?
If so, should they be removed along with audio and video after muxing?

Extract settings can be saved after closing program, just uncheck the timecodes setting, next time it won't extract timecodes anymore.
It is currently not used when remuxing .264 raw file.

Is it possible to allow it to remux just the audio to mp4?
Raw AAC doesn't work everywhere so I have to mux it into a mp4 container.

I don't what people mux aac to m4a and use for anything, but i will work more on audio muxing mode.

And can you disable always on top or make a setting for it?

Since I built it on Debug mode so I'm not sure where I can change the Always-on-top setting for this, i'll work on it also.
You temporally can press Minisize button.

[[ReX]]

Well, my Android phone can sometimes read raw AAC and sometimes it can't, it's weird.
My PSP can never read it, though.

[jofori89]

FLV Extract version 2.0.2
(June 12 2012):
http://code.google.com/p/flv-extraxct/

Front-end FLV extract and mp4/mkv remuxing GUI software.

Require:
- .Net 2.0 (if using XP).
- Mkvmerge.exe for mkv remuxing.
- mp4box.exe for mp4 remuxing.

Change log:
- Add options for re-muxing only audio track to mka / m4a files.
- Remove default state of Always-on-top option.
- Fix some glitch.

Screenshots:



Download:
http://code.google.com/p/flv-extraxct/downloads/list

This download file doesn't include mp4box.exe and mkvmerge.exe.