Support of FLV with audio which is not mp3

- We'll take a sample. But do not upload adult content. - Removing the rather annoying capitalized non in the summary

Sorry about the capitalization. I'm aware it's a strict no-no to upload adult content. Or posting a link to an adult site. Or upload members-only content to a free-hosting site like Badongo. But would it be okay to upload a short promo video (from an adult site but non-adult in nature) to something like Badongo?

I'd rather not have anything even related to an adult site or adult content provided as something we are going to be manipulating quite a bit. If you can't find example content that doesn't have an adult theme to it, we might be at a stand still.

I can see your point. I've run a very long search now and apparently there are two entirely different 'worlds': non-adult sites have FLV video with .mp3 audio and adult sites that use FLV with a different audio track, most likely ADPCM. So i haven't found a sample yet which i could offer to you but i won't give up.

So for now i can only contribute the info ffmpegX is giving: Video: flv, yuv420p, 320x240 Audio: 0x0005, 8000 Hz, mono

Interesting, that actually appears to be Nellymoser ASAO, a proprietary speech codec that doesn't yet have an open source decoder. It's only recently been reverse-engineered: Tanuki at http://www.flashcomguru.com/forum/forum_posts.asp?TID=1987&PN=1 promised to release a C++ implementation soon. It still would be good to have some samples to get a decoder into FFmpeg for our use; I don't have any myself and neither are there any in MPlayer's samples database the last time I checked.

Forgot to mention this ticket in the commit message, but I added support for the ADPCM variant in flv's in [409]. MPlayerhq's sample database had two samples, zelda.flv and zeldaHQ.flv, both of which now work for me. Probably won't fix the flvs that you're seeing though.

All this is interesting news. Now i gave ffmpegX a video from the other site mentioned (iFriends.net) and it is displaying this info: Video: flv, yuv420p, 320x240 Audio: 0x0006, 11025 Hz, mono

A different audio codec again?

Found the answer myself - it's a Nellymoser codec again apparently http://lists.mplayerhq.hu/pipermail/ffmpeg-user/2007-February/007244.html (at the bottom of that post)

Ok, a bit more info that i've found: FMS (Flash Media Server) records audio indeed by using the Nellymoser codec. And: there's no transcoder available unless you license one directly from Nellymoser - for what they're charging something like $5000 (which explains why even Sorenson Squeeze can't transcode FLVs with such audio tracks) Parts of that info you find here (scroll down to the feb 15, 2006 post) http://www.progettosinergia.com/flashvideo/flashvideoblog.htm

That explains why webcam networks are coming up with such files. But it is a problem for many using FMS.

Here's a site collecting info about this problem: http://nellymoser.codec.googlepages.com/

The MPlayer site has 2 FLV samples with Nellymoser audio now: http://samples.mplayerhq.hu/A-codecs/Nelly_Moser/ So there's something for testing finally.

Also there's the news (from Okt.15th, 2007) that FFmpeg will support flash videos using the Nellymoser codec http://ffmpeg.mplayerhq.hu/

Very short sample. At the bottom i've linked to a longer one.