int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
{
    Mpeg4DecContext *ctx = avctx->priv_data;
    MpegEncContext    *s = &ctx->m;

    /* divx 5.01+ bitstream reorder stuff */
    /* Since this clobbers the input buffer and hwaccel codecs still need the
     * data during hwaccel->end_frame we should not do this any earlier */
    if (s->divx_packed) {
        int current_pos     = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
        int startcode_found = 0;

        if (buf_size - current_pos > 7) {

            int i;
            for (i = current_pos; i < buf_size - 4; i++)

                if (buf[i]     == 0 &&
                    buf[i + 1] == 0 &&
                    buf[i + 2] == 1 &&
                    buf[i + 3] == 0xB6) {
                    startcode_found = !(buf[i + 4] & 0x40);
                    break;
                }
        }

        if (startcode_found) {
            av_fast_padded_malloc(&s->bitstream_buffer,
                           &s->allocated_bitstream_buffer_size,
                           buf_size - current_pos);
            if (!s->bitstream_buffer)
                return AVERROR(ENOMEM);
            memcpy(s->bitstream_buffer, buf + current_pos,
                   buf_size - current_pos);
            s->bitstream_buffer_size = buf_size - current_pos;
        }
    }

    return 0;
}