[Libav-user] Recent ffmpeg version doesn't support v4l2

Leandro Santiago leandrosansilva at gmail.com
Fri Jul 1 20:23:58 CEST 2011

Sorry for the delay (I was busy these days and couldn't answer). I
continue having problems with ffmpeg from trunk. The last which worked
with me is 0.7rc
the pastebin is in:

and the error, when I call av_open_input_file is:
[video4linux2 @ 0xa904180] ioctl set time per frame(7/8560628) failed

this call returns a valid value, but so I can't find any streams in
the input. With 0.7rc everything works fine.

The information about the camera:
05:08.0 Multimedia video controller: Brooktree Corporation Bt878 Video
Capture (rev 11)
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 32 (4000ns min, 10000ns max)
        Interrupt: pin A routed to IRQ 21
        Region 0: Memory at 9000f000 (32-bit, prefetchable) [size=4K]
        Capabilities: [44] Vital Product Data
                Unknown small resource type 00, will not decode more.
        Capabilities: [4c] Power Management version 2
                Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Kernel driver in use: bttv
        Kernel modules: bttv

2011/6/18 Nicolas George <nicolas.george at normalesup.org>:
> Le decadi 30 prairial, an CCXIX, Alex Cohn a écrit :
>> Could this be related to the requirement to build ffmpeg as superuser?
> There is no requirement to build ffmpeg as superuser.
>> On Saturday, June 18, 2011, Leandro Santiago <leandrosansilva-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org> wrote:
> Please do not top-post on these mailing-lists.
> Regards,
> --
>  Nicolas George
> Version: GnuPG v1.4.11 (GNU/Linux)
> Hw8AoLcNsQWOxMm7eExtUFBLGPiPcvk3
> =tDs+
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