[Libav-user] [dnxhd] Internal error, put_bits buffer too small

[Jonathan Noble]

It isn't reproduceable with ffmpeg. Am i in the wrong mailing-list?

On Thu, 3 Oct 2019 at 07:47, Paul B Mahol <onemda at gmail.com> wrote:

> Please provide input samples that allow to reproduce this issue with
> ffmpeg.
>
> On 10/2/19, Jonathan Noble <jonnobleuk at gmail.com> wrote:
> > Hi,
> >
> > I am trying to encode to dnxhd with libavcodec. The result is quite
> glitchy
> > with stuttering and anomalies on most frames.
> >
> > During encoding I see the following message almost continuously.
> >
> >> Internal error, put_bits buffer too small
> >
> > I have tried to understand what this buffer is, how it is set up and I am
> > struggling. From what I can understand the puts_bit buffer is
> > DNXHDEncContext->m->pb which is initialised via init_put_bits() in
> > dnxhd_encode_thread().
> >
> > The 2 arguments used in init_put_bits() are DNXHDEncContext->slice_offs
> and
> > DNXHDEncContext->slice_size. These 2 are configured in
> > dnxhd_setup_thread_slices() with 2 variables MpegEncContext->mb_width and
> > MpegEncContext->mb_bits.
> >
> > If my understanding is correct the 2 aforementioned variables in
> > MpegEncContext are the variables I need to set. However, I have no idea
> > what they mean or how they are accessed outside of
> > AVCodecContext->priv_data.
> >
> > Is my understanding correct? How does one setup the puts_bit buffer
> > correctly for a dnxhd encode?
> >
> > Kind regards
> >
> > Jon Noble
> >
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