How do I convert FLV files?

[8dn]

See topic.

[clsid]

Avidemux

[Placio74]

How do I convert FLV files?
- Avidemux,
- FFmpeg or MEncoder,
- GUI's for FFmpeg and MEncoder - MediaCoder, Internet Video Converter, SUPER, ...
- FLV Extract (extract A/V streams to AVI and MP3) > VirtualDub or other (+ffdshow for decode FLV1 and VP6F),
- FLV Splitter + ffdshow > Avisynth (DirectShowSource) > VirtualDub or other,
- FLV Splitter + ffdshow > TMPGEnc or some other (RAD Video Tools),
...

Edit FLV's - Avidemux, Movica (split & merge), ...


You can try ...
Spam?
This tool just use FFmpeg, libavcodec, Lame, ...

[Usa1955]

Is Flash Video a separate format or more or less a container? I've read it's some sort of MPEG4, so can it be converted through some remuxing or did it need a transcoder/encoder to get a standard mpeg4 file for some AVI/MP4/MKV file?

[Dark Shikari]

Is Flash Video a separate format or more or less a container? I've read it's some sort of MPEG4, so can it be converted through some remuxing or did it need a transcoder/encoder to get a standard mpeg4 file for some AVI/MP4/MKV file?FLV is a container. The format used by Youtube is 22khz, 48kbps mono MP3 audio with Sorenson H.263 video. Total bitrate cannot exceed 350kbps.

[Usa1955]

Thanks. cause I was looking to find out if this Sorenson H.263 video can be somehow converted/remuxed to some sort oft standardized mpeg4-stream and played by an MPEG4 Decoder which runs Divx, Xvid, AVC, etc.. Or does it require to reencode to the specific codec? thank you

[foxyshadis]

No, it's a completely incompatible codec. You can remux it into other containers though, like avi or mkv. H.263 is lousy enough that anything you recompress it to can usually save a lot of space without noticeably losing quality.

[Usa1955]

thank you

[arionon]

flv is the special video format. so u need one professional convert tool to convert. Try ann video converter

[pckillers]

FFmpeg has some problem on demuxing VP6F FLV

so I use FLV Extract

[Placio74]

FFmpeg has some problem on demuxing VP6F FLV

so I use FLV Extract
What FFmpeg build and what is syntax?

FLV Extract is good choice, however i'm can use FFmpeg to change container without problems (with one exception - stupid 1000 FPS).


And little update...
Latest VirtualDub + FLV input plugin (+ffdshow VfW of course).
http://forums.virtualdub.org/index.php?&act=ST&f=7&t=14639

BTW
Latest FLV input plugin can convert FPS when open FLV with VFR.
Latest VirtualDub support MP3 VBR.
Well, A/V sync it's no problem when convert most FLV's (with some exceptions).

[pckillers]

Yes... Demuxing Soreson FLV with ffmpeg is okay but it gives me a 1000FPS avi when demuxing VP6F streams...

[Dark Shikari]

Yes... Demuxing Soreson FLV with ffmpeg is okay but it gives me a 1000FPS avi when demuxing VP6F streams...That's because 1000FPS is the default when no FPS is specified.

[Placio74]

That's because 1000FPS is the default when no FPS is specified.
Yes. When FPS not defined in container (?).

When change container without recompression (example)...
Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 29.97 (30000/1001)
http://img221.imageshack.us/img221/1810/flvfpsza7.th.jpg (http://img221.imageshack.us/my.php?image=flvfpsza7.jpg)

I'm can change (convert) FPS used VirtualDub (without recompression).
Not use VirtualDubMod (1.5.10 is too old).

---
When FLV contain variable FPS (difference between average frame rate and estimated true frame rate)...
- Avisynth (DirectShowSource with correct FPS and ConvertFPS) + FLV Splitter and ffdshow,
- or FFmpeg (and some GUI's),
- or VirtualDub with FLV input plugin,
- or VirtualDub with DirectShow input plugin.

Unfortunately, when difference between average frame rate and estimated true frame rate ... Avidemux, MEncoder and FLV Extract = out of sync. A/V.

FLV Extract > MKVtoolnix (AVI, MP3 and timecodes > MKV) = sync. A/V is good, but this is MKV with VFR.

[pckillers]

So there do is a way to make variable FPS FLV?

I've opened another thread to ask about making VFR FLV with a timecode that I generated with AVS Dedup plugin.
http://forum.doom9.org/showthread.php?t=131002

but still have not got an answer.

Can ffmpeg do it? Or should I use something else like mencoder?

[foxyshadis]

ffmpeg and mencoder can't, iirc. The only way I know of is to use directshow, with the on2 flix dshow muxer. Not a great option.

[Foofaraw]

Spam?
This tool just use FFmpeg, libavcodec, Lame, ...

What was in the message deleted? Does it matter what the tool used if it what was required of it?

[NoX1911]

Any chance to get variable framerate FLV to constant framerate avi with a/v in sync? I tried ffmpegsource/ffaudiosource, avidemux and FLV extract. Even AVS script with ffmpegsource/ffaudiosource doesn't play in sync.

I want to load FLV videos in adobe premiere, adobe audition, virtualdub and avidemux and i need a/v sync.

[setarip_old]

@NoX1911

Hi!

You might try using the latest VirtualDub plus the recently available FLV plugin...

[NoX1911]

Thx, will test it later. I used a workaround in the meantime. If you add '&fmt=18' to a youtube url you can get .mp4's (instead of flv). No problems there with ffmpegsource and i could convert it to avi with virtualdub without problems.

[Placio74]

... If you add '&fmt=18' to a youtube url you can get .mp4's (instead of flv). No problems there with ffmpegsource and i could convert it to avi with virtualdub without problems.
However, then can use QuickTime input plugin.

[neuron2]

Closing thread as it is old and has become a spammer's paradise.