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

[Paul B Mahol]

On 10/3/19, Jonathan Noble <jonnobleuk at gmail.com> wrote:
> It isn't reproduceable with ffmpeg. Am i in the wrong mailing-list?

Perhaps you reset frame_size somehow?

>
> 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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>