How can I know what kind of audio is in an FLV file?

[Chainmax]

I am trying Moyea's Flash2Video in order to convert two FLVs into Lagarith for further editing. Now, this program lets you keep the source's framerate and resolution, but makes you choose the number of channels and samplerate. Since I'd rather use a VST plugin and SSRC or SRCDrop in order to change those two, I wanted to know if it's possible to find out the number of channels and samplerate that was used for the audio. Is that possible?

[anonymez]

play in mpc, file-->properties.

for flv-->whatever, better to use avisynth directshowsource(), just have ffdshow with FLV decoding enabled and gabest's flvsplitter registered. encode with vdub or similar. much better than commercial stuff :)

[Chainmax]

Ok, I enabled libavcodec decoding for FLV1 on both the "video decoder" and "VFW codec" tabs. Now I'll download Gabest's FLVSplitter, thanks for the advice :).

[Chainmax]

Hmm...the "Playing Information" dialog in Zoomplayer reports the file as having 29.97fps but the FFDShow's "Video Decoder" section reports it as having 25fps. Which one is right?

[anonymez]

how should i know? i don't have the file :P

i'd trust whatever ffdshow says since it's actually doing the decoding, as long as it's not jerky (in which case ffdshow is playing at the wrong speed)

[Chainmax]

I'm leaning towards ffdshow's opinion myself, but I wonder why would ZoomPlayer display wrong information.

[foxyshadis]

flv can be vfr, so all values could be wrong. But ffdshow and the player both pick it up from the splitter, so perhaps they just ask at different times. They only way to know for sure is to remux to, say, mkv with ffmpeg then extract the timestamps, and see what it gives you.

[Chainmax]

You mean take the whole file and mux it? If not, how can I demux an FLV file?

[Chainmax]

Is there a quicker way to know?

[Reino]

Chainmax, take a look at this thread (http://forum.inmatrix.com/index.php?showtopic=4399).
In case of FLV-files most of the time (always?) it's MP3 what's inside.

[Chainmax]

ffdshow reports it as such, but I still need to know what to trust regarding framerate. I'll look into that thread, thanks for the heads-up.