[Libav-user] h264_mp4toannexb_filter

[Wagner Patriota]

I am a newbee on this... I dont know how to do it... :-(
is there any content I can read more about this anywhere else?

On Wed, Apr 11, 2012 at 6:55 PM, Alex Cohn <alexcohn at netvision.net.il>wrote:

> On Apr 11, 2012 10:37 PM, "Wagner Patriota" <wagner.patriota at gmail.com>
> wrote:
> >
> > YES, I got the same conclusion! but how do I convert the frames?
> > that's what I still don't understand. I was expecting the filter do it
> for me... any idea? :-(
> >
> > On Wed, Apr 11, 2012 at 4:19 PM, Alex Cohn <alexcohn at netvision.net.il>
> wrote:
> >>
> >> On Apr 11, 2012 9:37 PM, "Wagner Patriota" <wagner.patriota at gmail.com>
> wrote:
> >> >
> >> > ExtraData:
> 00000001674D400D96528322FF2FFE080007F0A100000303E90000BB80604000825C000412FFF18E302000412E0002097FF8C70ED09128B00000000168E9093520
> >> > So what is wrong?
> >> >
> >> > 1. If I don't use the filter, I get this message:
> >> > "H.264 bitstream malformed, no startcode found, use the
> h264_mp4toannexb bitstream filter (-bsf h264_mp4toannexb)""
> >> > Because "AV_RB32(pkt->data) != 0x0000001" (in
> fact, AV_RB32(pkt->data) = 0x1B13)
> >>
> >> Could it be that while your extradata is in annex b format, the frames
> still need conversion?  0x1B13 looks like a start of a regular packet.
>
> You can try to convert extradata (SPS/PPS) to Nal format, attach it to the
> first frame (before the frame data), and pass the resulting stream through
> the annex b filter.
>
> Or you could prepend each frame with 0x00000001 without the filter.
>
> Note that you should not give SPS/PPS data to the decode function
> separately, but only with the IDR frame data.
>
> BR,
> Alex
>
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