flv container can be used for h.264 && AAC?

[sunshine_august]

hi:
I used the following line to convert an avi file to flv:
ffmpeg.exe -i fengyun.avi -acodec libfaac -ac 2 -ab 16k -vcodec libx264 -coder 1 -g 250 -keyint_min 25 -sc_threshold 40 -bf 3 -b_strategy 1 -partitions +parti8x8+parti4x4+par
tp8x8+partb8x8 -directpred 1 -flags +loop -deblockalpha 0 -deblockbeta 0 -flags2 +fastpskip+wpred-dct8x8 -me_method hex -me_range 16 -subq 6 -trellis 1 -b 300k -qcomp 0.6 -i_q
factor 0.71 -qmin 10 -qmax 51 -qdiff 4 -r 29.97 -s 640x480 -y fengyun.flv

The interestring thing is that, this cmd run successfully, and I use the mediainfo.exe to check the flv file:

Format : Flash Video
File size : 2.50 MiB
Duration : 1mn 0s
Overall bit rate : 345 Kbps

Video
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L3.0
Format settings, CABAC : Yes
Format settings, ReFrames : 2 frames
Muxing mode : Container profile=Unknown@3.0
Duration : 1mn 0s
Bit rate : 293 Kbps
Nominal bit rate : 300 Kbps
Width : 640 pixels
Height : 480 pixels
Display aspect ratio : 2.35
Frame rate : 29.970 fps
Resolution : 24 bits
Colorimetry : 4:2:0
Scan type : Progressive
Bits/(Pixel*Frame) : 0.032
Writing library : x264 core 72
Encoding settings : cabac=1 / ref=1 / deblock=1:0:0 / analyse=0x1:0x111 / me=hex / subme=6 / psy=1 / psy_rd=1.0:0.0 / mixed_ref=0 / me_range=16 / chroma_me=0 / trellis=1 / 8x8dct=0 / cqm=0 / deadzone=21,11 / chroma_qp_offset=-2 / threads=1 / nr=0 / decimate=1 / mbaff=0 / bframes=3 / b_pyramid=0 / b_adapt=1 / b_bias=0 / direct=1 / wpredb=32 / keyint=250 / keyint_min=25 / scenecut=40 / rc_lookahead=40 / rc=abr / mbtree=1 / bitrate=300 / ratetol=13.3 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / ip_ratio=1.41 / aq=1:1.00

Audio
Format : AAC
Format/Info : Advanced Audio Codec
Format version : Version 4
Format profile : LC
Format settings, SBR : No
Duration : 1mn 0s
Bit rate : 15.6 Kbps
Channel(s) : 2 channels
Channel positions : L R
Sampling rate : 44.1 KHz
Resolution : 16 bits

It seems that indeed ffmpeg can mux h264 and AAC into flv container. But can flv container be used for h.264 && AAC ? Originally I think f4v is the right container for h.264 && AAC, not flv.

[Dark Shikari]

There is no such container as "f4v". It does not exist.

[sunshine_august]

do you mean flv container is used for both FLV and F4V specification?

[Dark Shikari]

do you mean flv container is used for both FLV and F4V specification?There is no f4v specification. f4v is an new extension that Adobe made up one day when they were on a particularly good acid trip. It doesn't specify a new container format.

[sunshine_august]

I see some files with ".f4v" file extension, so I think there is "f4v" container:(
It seems that I misunderstood f4v as a container.
sorry for that, I am new to video/audio encoding.

[sunshine_august]

There is no f4v specification. f4v is an new extension that Adobe made up one day when they were on a particularly good acid trip. It doesn't specify a new container format.

so what is f4v? just flv container muxed with h.264 && AAC?

[Placio74]

so what is f4v? just flv container muxed with h.264 && AAC?

No.
Look at specs (http://www.adobe.com/devnet/flv/pdf/video_file_format_spec_v9.pdf).
The F4V format is based on the format specified by ISO/IEC 14496-12: ISO base media file format.
Simplifying, it's slightly modified MP4.